PostgreSQL Source Code  git master
parse_relation.c File Reference
#include "postgres.h"
#include <ctype.h>
#include "access/htup_details.h"
#include "access/relation.h"
#include "access/sysattr.h"
#include "access/table.h"
#include "catalog/heap.h"
#include "catalog/namespace.h"
#include "catalog/pg_type.h"
#include "funcapi.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "parser/parse_enr.h"
#include "parser/parse_relation.h"
#include "parser/parse_type.h"
#include "parser/parsetree.h"
#include "storage/lmgr.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#include "utils/varlena.h"
Include dependency graph for parse_relation.c:

Go to the source code of this file.

Data Structures

struct  FuzzyAttrMatchState
 

Macros

#define MAX_FUZZY_DISTANCE   3
 

Functions

static ParseNamespaceItemscanNameSpaceForRefname (ParseState *pstate, const char *refname, int location)
 
static ParseNamespaceItemscanNameSpaceForRelid (ParseState *pstate, Oid relid, int location)
 
static void check_lateral_ref_ok (ParseState *pstate, ParseNamespaceItem *nsitem, int location)
 
static int scanRTEForColumn (ParseState *pstate, RangeTblEntry *rte, Alias *eref, const char *colname, int location, int fuzzy_rte_penalty, FuzzyAttrMatchState *fuzzystate)
 
static void markRTEForSelectPriv (ParseState *pstate, int rtindex, AttrNumber col)
 
static void expandRelation (Oid relid, Alias *eref, int rtindex, int sublevels_up, int location, bool include_dropped, List **colnames, List **colvars)
 
static void expandTupleDesc (TupleDesc tupdesc, Alias *eref, int count, int offset, int rtindex, int sublevels_up, int location, bool include_dropped, List **colnames, List **colvars)
 
static int specialAttNum (const char *attname)
 
static bool rte_visible_if_lateral (ParseState *pstate, RangeTblEntry *rte)
 
static bool rte_visible_if_qualified (ParseState *pstate, RangeTblEntry *rte)
 
static bool isQueryUsingTempRelation_walker (Node *node, void *context)
 
ParseNamespaceItemrefnameNamespaceItem (ParseState *pstate, const char *schemaname, const char *refname, int location, int *sublevels_up)
 
CommonTableExprscanNameSpaceForCTE (ParseState *pstate, const char *refname, Index *ctelevelsup)
 
static bool isFutureCTE (ParseState *pstate, const char *refname)
 
bool scanNameSpaceForENR (ParseState *pstate, const char *refname)
 
static RangeTblEntrysearchRangeTableForRel (ParseState *pstate, RangeVar *relation)
 
void checkNameSpaceConflicts (ParseState *pstate, List *namespace1, List *namespace2)
 
ParseNamespaceItemGetNSItemByRangeTablePosn (ParseState *pstate, int varno, int sublevels_up)
 
RangeTblEntryGetRTEByRangeTablePosn (ParseState *pstate, int varno, int sublevels_up)
 
CommonTableExprGetCTEForRTE (ParseState *pstate, RangeTblEntry *rte, int rtelevelsup)
 
static void updateFuzzyAttrMatchState (int fuzzy_rte_penalty, FuzzyAttrMatchState *fuzzystate, RangeTblEntry *rte, const char *actual, const char *match, int attnum)
 
NodescanNSItemForColumn (ParseState *pstate, ParseNamespaceItem *nsitem, int sublevels_up, const char *colname, int location)
 
NodecolNameToVar (ParseState *pstate, const char *colname, bool localonly, int location)
 
static FuzzyAttrMatchStatesearchRangeTableForCol (ParseState *pstate, const char *alias, const char *colname, int location)
 
void markNullableIfNeeded (ParseState *pstate, Var *var)
 
void markVarForSelectPriv (ParseState *pstate, Var *var)
 
static void buildRelationAliases (TupleDesc tupdesc, Alias *alias, Alias *eref)
 
static char * chooseScalarFunctionAlias (Node *funcexpr, char *funcname, Alias *alias, int nfuncs)
 
static ParseNamespaceItembuildNSItemFromTupleDesc (RangeTblEntry *rte, Index rtindex, RTEPermissionInfo *perminfo, TupleDesc tupdesc)
 
static ParseNamespaceItembuildNSItemFromLists (RangeTblEntry *rte, Index rtindex, List *coltypes, List *coltypmods, List *colcollations)
 
Relation parserOpenTable (ParseState *pstate, const RangeVar *relation, int lockmode)
 
ParseNamespaceItemaddRangeTableEntry (ParseState *pstate, RangeVar *relation, Alias *alias, bool inh, bool inFromCl)
 
ParseNamespaceItemaddRangeTableEntryForRelation (ParseState *pstate, Relation rel, int lockmode, Alias *alias, bool inh, bool inFromCl)
 
ParseNamespaceItemaddRangeTableEntryForSubquery (ParseState *pstate, Query *subquery, Alias *alias, bool lateral, bool inFromCl)
 
ParseNamespaceItemaddRangeTableEntryForFunction (ParseState *pstate, List *funcnames, List *funcexprs, List *coldeflists, RangeFunction *rangefunc, bool lateral, bool inFromCl)
 
ParseNamespaceItemaddRangeTableEntryForTableFunc (ParseState *pstate, TableFunc *tf, Alias *alias, bool lateral, bool inFromCl)
 
ParseNamespaceItemaddRangeTableEntryForValues (ParseState *pstate, List *exprs, List *coltypes, List *coltypmods, List *colcollations, Alias *alias, bool lateral, bool inFromCl)
 
ParseNamespaceItemaddRangeTableEntryForJoin (ParseState *pstate, List *colnames, ParseNamespaceColumn *nscolumns, JoinType jointype, int nummergedcols, List *aliasvars, List *leftcols, List *rightcols, Alias *join_using_alias, Alias *alias, bool inFromCl)
 
ParseNamespaceItemaddRangeTableEntryForCTE (ParseState *pstate, CommonTableExpr *cte, Index levelsup, RangeVar *rv, bool inFromCl)
 
ParseNamespaceItemaddRangeTableEntryForENR (ParseState *pstate, RangeVar *rv, bool inFromCl)
 
bool isLockedRefname (ParseState *pstate, const char *refname)
 
void addNSItemToQuery (ParseState *pstate, ParseNamespaceItem *nsitem, bool addToJoinList, bool addToRelNameSpace, bool addToVarNameSpace)
 
void expandRTE (RangeTblEntry *rte, int rtindex, int sublevels_up, int location, bool include_dropped, List **colnames, List **colvars)
 
ListexpandNSItemVars (ParseState *pstate, ParseNamespaceItem *nsitem, int sublevels_up, int location, List **colnames)
 
ListexpandNSItemAttrs (ParseState *pstate, ParseNamespaceItem *nsitem, int sublevels_up, bool require_col_privs, int location)
 
char * get_rte_attribute_name (RangeTblEntry *rte, AttrNumber attnum)
 
bool get_rte_attribute_is_dropped (RangeTblEntry *rte, AttrNumber attnum)
 
TargetEntryget_tle_by_resno (List *tlist, AttrNumber resno)
 
RowMarkClauseget_parse_rowmark (Query *qry, Index rtindex)
 
int attnameAttNum (Relation rd, const char *attname, bool sysColOK)
 
const NameDataattnumAttName (Relation rd, int attid)
 
Oid attnumTypeId (Relation rd, int attid)
 
Oid attnumCollationId (Relation rd, int attid)
 
void errorMissingRTE (ParseState *pstate, RangeVar *relation)
 
void errorMissingColumn (ParseState *pstate, const char *relname, const char *colname, int location)
 
static ParseNamespaceItemfindNSItemForRTE (ParseState *pstate, RangeTblEntry *rte)
 
bool isQueryUsingTempRelation (Query *query)
 
RTEPermissionInfoaddRTEPermissionInfo (List **rteperminfos, RangeTblEntry *rte)
 
RTEPermissionInfogetRTEPermissionInfo (List *rteperminfos, RangeTblEntry *rte)
 

Macro Definition Documentation

◆ MAX_FUZZY_DISTANCE

#define MAX_FUZZY_DISTANCE   3

Definition at line 75 of file parse_relation.c.

Function Documentation

◆ addNSItemToQuery()

void addNSItemToQuery ( ParseState pstate,
ParseNamespaceItem nsitem,
bool  addToJoinList,
bool  addToRelNameSpace,
bool  addToVarNameSpace 
)

Definition at line 2624 of file parse_relation.c.

2627 {
2628  if (addToJoinList)
2629  {
2631 
2632  rtr->rtindex = nsitem->p_rtindex;
2633  pstate->p_joinlist = lappend(pstate->p_joinlist, rtr);
2634  }
2635  if (addToRelNameSpace || addToVarNameSpace)
2636  {
2637  /* Set the new nsitem's visibility flags correctly */
2638  nsitem->p_rel_visible = addToRelNameSpace;
2639  nsitem->p_cols_visible = addToVarNameSpace;
2640  nsitem->p_lateral_only = false;
2641  nsitem->p_lateral_ok = true;
2642  pstate->p_namespace = lappend(pstate->p_namespace, nsitem);
2643  }
2644 }
List * lappend(List *list, void *datum)
Definition: list.c:338
#define makeNode(_type_)
Definition: nodes.h:176
List * p_namespace
Definition: parse_node.h:200
List * p_joinlist
Definition: parse_node.h:198

References lappend(), makeNode, ParseNamespaceItem::p_cols_visible, ParseState::p_joinlist, ParseNamespaceItem::p_lateral_ok, ParseNamespaceItem::p_lateral_only, ParseState::p_namespace, ParseNamespaceItem::p_rel_visible, ParseNamespaceItem::p_rtindex, and RangeTblRef::rtindex.

Referenced by AddRelationNewConstraints(), AlterPolicy(), CreatePolicy(), CreateTriggerFiringOn(), DefineRelation(), DoCopy(), setTargetTable(), test_rls_hooks_permissive(), test_rls_hooks_restrictive(), transformAlterTableStmt(), transformIndexStmt(), transformInsertStmt(), transformMergeStmt(), transformOnConflictClause(), transformPartitionSpec(), TransformPubWhereClauses(), transformRuleStmt(), transformSetOperationStmt(), transformStatsStmt(), and transformValuesClause().

◆ addRangeTableEntry()

ParseNamespaceItem* addRangeTableEntry ( ParseState pstate,
RangeVar relation,
Alias alias,
bool  inh,
bool  inFromCl 
)

Definition at line 1469 of file parse_relation.c.

1474 {
1476  RTEPermissionInfo *perminfo;
1477  char *refname = alias ? alias->aliasname : relation->relname;
1478  LOCKMODE lockmode;
1479  Relation rel;
1480  ParseNamespaceItem *nsitem;
1481 
1482  Assert(pstate != NULL);
1483 
1484  rte->rtekind = RTE_RELATION;
1485  rte->alias = alias;
1486 
1487  /*
1488  * Identify the type of lock we'll need on this relation. It's not the
1489  * query's target table (that case is handled elsewhere), so we need
1490  * either RowShareLock if it's locked by FOR UPDATE/SHARE, or plain
1491  * AccessShareLock otherwise.
1492  */
1493  lockmode = isLockedRefname(pstate, refname) ? RowShareLock : AccessShareLock;
1494 
1495  /*
1496  * Get the rel's OID. This access also ensures that we have an up-to-date
1497  * relcache entry for the rel. Since this is typically the first access
1498  * to a rel in a statement, we must open the rel with the proper lockmode.
1499  */
1500  rel = parserOpenTable(pstate, relation, lockmode);
1501  rte->relid = RelationGetRelid(rel);
1502  rte->relkind = rel->rd_rel->relkind;
1503  rte->rellockmode = lockmode;
1504 
1505  /*
1506  * Build the list of effective column names using user-supplied aliases
1507  * and/or actual column names.
1508  */
1509  rte->eref = makeAlias(refname, NIL);
1510  buildRelationAliases(rel->rd_att, alias, rte->eref);
1511 
1512  /*
1513  * Set flags and initialize access permissions.
1514  *
1515  * The initial default on access checks is always check-for-READ-access,
1516  * which is the right thing for all except target tables.
1517  */
1518  rte->lateral = false;
1519  rte->inh = inh;
1520  rte->inFromCl = inFromCl;
1521 
1522  perminfo = addRTEPermissionInfo(&pstate->p_rteperminfos, rte);
1523  perminfo->requiredPerms = ACL_SELECT;
1524 
1525  /*
1526  * Add completed RTE to pstate's range table list, so that we know its
1527  * index. But we don't add it to the join list --- caller must do that if
1528  * appropriate.
1529  */
1530  pstate->p_rtable = lappend(pstate->p_rtable, rte);
1531 
1532  /*
1533  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
1534  * list --- caller must do that if appropriate.
1535  */
1536  nsitem = buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable),
1537  perminfo, rel->rd_att);
1538 
1539  /*
1540  * Drop the rel refcount, but keep the access lock till end of transaction
1541  * so that the table can't be deleted or have its schema modified
1542  * underneath us.
1543  */
1544  table_close(rel, NoLock);
1545 
1546  return nsitem;
1547 }
Assert(fmt[strlen(fmt) - 1] !='\n')
int LOCKMODE
Definition: lockdefs.h:26
#define NoLock
Definition: lockdefs.h:34
#define AccessShareLock
Definition: lockdefs.h:36
#define RowShareLock
Definition: lockdefs.h:37
Alias * makeAlias(const char *aliasname, List *colnames)
Definition: makefuncs.c:390
RTEPermissionInfo * addRTEPermissionInfo(List **rteperminfos, RangeTblEntry *rte)
Relation parserOpenTable(ParseState *pstate, const RangeVar *relation, int lockmode)
static ParseNamespaceItem * buildNSItemFromTupleDesc(RangeTblEntry *rte, Index rtindex, RTEPermissionInfo *perminfo, TupleDesc tupdesc)
bool isLockedRefname(ParseState *pstate, const char *refname)
static void buildRelationAliases(TupleDesc tupdesc, Alias *alias, Alias *eref)
@ RTE_RELATION
Definition: parsenodes.h:1014
#define ACL_SELECT
Definition: parsenodes.h:84
static int list_length(const List *l)
Definition: pg_list.h:152
#define NIL
Definition: pg_list.h:68
#define RelationGetRelid(relation)
Definition: rel.h:504
char * aliasname
Definition: primnodes.h:42
List * p_rteperminfos
Definition: parse_node.h:194
List * p_rtable
Definition: parse_node.h:193
AclMode requiredPerms
Definition: parsenodes.h:1246
Alias * eref
Definition: parsenodes.h:1200
Alias * alias
Definition: parsenodes.h:1199
RTEKind rtekind
Definition: parsenodes.h:1033
char * relname
Definition: primnodes.h:74
TupleDesc rd_att
Definition: rel.h:112
Form_pg_class rd_rel
Definition: rel.h:111
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:126

References AccessShareLock, ACL_SELECT, addRTEPermissionInfo(), RangeTblEntry::alias, Alias::aliasname, Assert(), buildNSItemFromTupleDesc(), buildRelationAliases(), RangeTblEntry::eref, RangeTblEntry::inFromCl, RangeTblEntry::inh, isLockedRefname(), lappend(), RangeTblEntry::lateral, list_length(), makeAlias(), makeNode, NIL, NoLock, ParseState::p_rtable, ParseState::p_rteperminfos, parserOpenTable(), RelationData::rd_att, RelationData::rd_rel, RelationGetRelid, RangeTblEntry::relid, RangeTblEntry::relkind, RangeTblEntry::rellockmode, RangeVar::relname, RTEPermissionInfo::requiredPerms, RowShareLock, RTE_RELATION, RangeTblEntry::rtekind, and table_close().

Referenced by transformTableEntry().

◆ addRangeTableEntryForCTE()

ParseNamespaceItem* addRangeTableEntryForCTE ( ParseState pstate,
CommonTableExpr cte,
Index  levelsup,
RangeVar rv,
bool  inFromCl 
)

Definition at line 2318 of file parse_relation.c.

2323 {
2325  Alias *alias = rv->alias;
2326  char *refname = alias ? alias->aliasname : cte->ctename;
2327  Alias *eref;
2328  int numaliases;
2329  int varattno;
2330  ListCell *lc;
2331  int n_dontexpand_columns = 0;
2332  ParseNamespaceItem *psi;
2333 
2334  Assert(pstate != NULL);
2335 
2336  rte->rtekind = RTE_CTE;
2337  rte->ctename = cte->ctename;
2338  rte->ctelevelsup = levelsup;
2339 
2340  /* Self-reference if and only if CTE's parse analysis isn't completed */
2341  rte->self_reference = !IsA(cte->ctequery, Query);
2342  Assert(cte->cterecursive || !rte->self_reference);
2343  /* Bump the CTE's refcount if this isn't a self-reference */
2344  if (!rte->self_reference)
2345  cte->cterefcount++;
2346 
2347  /*
2348  * We throw error if the CTE is INSERT/UPDATE/DELETE without RETURNING.
2349  * This won't get checked in case of a self-reference, but that's OK
2350  * because data-modifying CTEs aren't allowed to be recursive anyhow.
2351  */
2352  if (IsA(cte->ctequery, Query))
2353  {
2354  Query *ctequery = (Query *) cte->ctequery;
2355 
2356  if (ctequery->commandType != CMD_SELECT &&
2357  ctequery->returningList == NIL)
2358  ereport(ERROR,
2359  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2360  errmsg("WITH query \"%s\" does not have a RETURNING clause",
2361  cte->ctename),
2362  parser_errposition(pstate, rv->location)));
2363  }
2364 
2365  rte->coltypes = list_copy(cte->ctecoltypes);
2366  rte->coltypmods = list_copy(cte->ctecoltypmods);
2367  rte->colcollations = list_copy(cte->ctecolcollations);
2368 
2369  rte->alias = alias;
2370  if (alias)
2371  eref = copyObject(alias);
2372  else
2373  eref = makeAlias(refname, NIL);
2374  numaliases = list_length(eref->colnames);
2375 
2376  /* fill in any unspecified alias columns */
2377  varattno = 0;
2378  foreach(lc, cte->ctecolnames)
2379  {
2380  varattno++;
2381  if (varattno > numaliases)
2382  eref->colnames = lappend(eref->colnames, lfirst(lc));
2383  }
2384  if (varattno < numaliases)
2385  ereport(ERROR,
2386  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2387  errmsg("table \"%s\" has %d columns available but %d columns specified",
2388  refname, varattno, numaliases)));
2389 
2390  rte->eref = eref;
2391 
2392  if (cte->search_clause)
2393  {
2394  rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->search_clause->search_seq_column));
2395  if (cte->search_clause->search_breadth_first)
2396  rte->coltypes = lappend_oid(rte->coltypes, RECORDOID);
2397  else
2398  rte->coltypes = lappend_oid(rte->coltypes, RECORDARRAYOID);
2399  rte->coltypmods = lappend_int(rte->coltypmods, -1);
2401 
2402  n_dontexpand_columns += 1;
2403  }
2404 
2405  if (cte->cycle_clause)
2406  {
2407  rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->cycle_clause->cycle_mark_column));
2408  rte->coltypes = lappend_oid(rte->coltypes, cte->cycle_clause->cycle_mark_type);
2409  rte->coltypmods = lappend_int(rte->coltypmods, cte->cycle_clause->cycle_mark_typmod);
2410  rte->colcollations = lappend_oid(rte->colcollations, cte->cycle_clause->cycle_mark_collation);
2411 
2412  rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->cycle_clause->cycle_path_column));
2413  rte->coltypes = lappend_oid(rte->coltypes, RECORDARRAYOID);
2414  rte->coltypmods = lappend_int(rte->coltypmods, -1);
2416 
2417  n_dontexpand_columns += 2;
2418  }
2419 
2420  /*
2421  * Set flags and access permissions.
2422  *
2423  * Subqueries are never checked for access rights, so no need to perform
2424  * addRTEPermissionInfo().
2425  */
2426  rte->lateral = false;
2427  rte->inh = false; /* never true for subqueries */
2428  rte->inFromCl = inFromCl;
2429 
2430  /*
2431  * Add completed RTE to pstate's range table list, so that we know its
2432  * index. But we don't add it to the join list --- caller must do that if
2433  * appropriate.
2434  */
2435  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2436 
2437  /*
2438  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2439  * list --- caller must do that if appropriate.
2440  */
2441  psi = buildNSItemFromLists(rte, list_length(pstate->p_rtable),
2442  rte->coltypes, rte->coltypmods,
2443  rte->colcollations);
2444 
2445  /*
2446  * The columns added by search and cycle clauses are not included in star
2447  * expansion in queries contained in the CTE.
2448  */
2449  if (rte->ctelevelsup > 0)
2450  for (int i = 0; i < n_dontexpand_columns; i++)
2451  psi->p_nscolumns[list_length(psi->p_names->colnames) - 1 - i].p_dontexpand = true;
2452 
2453  return psi;
2454 }
int errcode(int sqlerrcode)
Definition: elog.c:858
int errmsg(const char *fmt,...)
Definition: elog.c:1069
#define ERROR
Definition: elog.h:39
#define ereport(elevel,...)
Definition: elog.h:149
int i
Definition: isn.c:73
if(TABLE==NULL||TABLE_index==NULL)
Definition: isn.c:77
List * lappend_int(List *list, int datum)
Definition: list.c:356
List * lappend_oid(List *list, Oid datum)
Definition: list.c:374
List * list_copy(const List *oldlist)
Definition: list.c:1572
#define IsA(nodeptr, _type_)
Definition: nodes.h:179
#define copyObject(obj)
Definition: nodes.h:244
@ CMD_SELECT
Definition: nodes.h:276
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111
static ParseNamespaceItem * buildNSItemFromLists(RangeTblEntry *rte, Index rtindex, List *coltypes, List *coltypmods, List *colcollations)
@ RTE_CTE
Definition: parsenodes.h:1020
#define lfirst(lc)
Definition: pg_list.h:172
#define InvalidOid
Definition: postgres_ext.h:36
List * colnames
Definition: primnodes.h:43
ParseNamespaceColumn * p_nscolumns
Definition: parse_node.h:290
List * returningList
Definition: parsenodes.h:196
CmdType commandType
Definition: parsenodes.h:128
List * colcollations
Definition: parsenodes.h:1188
char * ctename
Definition: parsenodes.h:1164
bool self_reference
Definition: parsenodes.h:1166
Index ctelevelsup
Definition: parsenodes.h:1165
List * coltypes
Definition: parsenodes.h:1186
List * coltypmods
Definition: parsenodes.h:1187
int location
Definition: primnodes.h:86
Alias * alias
Definition: primnodes.h:83
String * makeString(char *str)
Definition: value.c:63

References RangeTblEntry::alias, RangeVar::alias, Alias::aliasname, Assert(), buildNSItemFromLists(), CMD_SELECT, RangeTblEntry::colcollations, Alias::colnames, RangeTblEntry::coltypes, RangeTblEntry::coltypmods, Query::commandType, copyObject, RangeTblEntry::ctelevelsup, RangeTblEntry::ctename, CommonTableExpr::ctename, CommonTableExpr::ctequery, RangeTblEntry::eref, ereport, errcode(), errmsg(), ERROR, i, if(), RangeTblEntry::inFromCl, RangeTblEntry::inh, InvalidOid, IsA, lappend(), lappend_int(), lappend_oid(), RangeTblEntry::lateral, lfirst, list_copy(), list_length(), RangeVar::location, makeAlias(), makeNode, makeString(), NIL, ParseNamespaceColumn::p_dontexpand, ParseNamespaceItem::p_names, ParseNamespaceItem::p_nscolumns, ParseState::p_rtable, parser_errposition(), Query::returningList, RTE_CTE, RangeTblEntry::rtekind, and RangeTblEntry::self_reference.

Referenced by getNSItemForSpecialRelationTypes().

◆ addRangeTableEntryForENR()

ParseNamespaceItem* addRangeTableEntryForENR ( ParseState pstate,
RangeVar rv,
bool  inFromCl 
)

Definition at line 2470 of file parse_relation.c.

2473 {
2475  Alias *alias = rv->alias;
2476  char *refname = alias ? alias->aliasname : rv->relname;
2478  TupleDesc tupdesc;
2479  int attno;
2480 
2481  Assert(pstate != NULL);
2482  enrmd = get_visible_ENR(pstate, rv->relname);
2483  Assert(enrmd != NULL);
2484 
2485  switch (enrmd->enrtype)
2486  {
2487  case ENR_NAMED_TUPLESTORE:
2489  break;
2490 
2491  default:
2492  elog(ERROR, "unexpected enrtype: %d", enrmd->enrtype);
2493  return NULL; /* for fussy compilers */
2494  }
2495 
2496  /*
2497  * Record dependency on a relation. This allows plans to be invalidated
2498  * if they access transition tables linked to a table that is altered.
2499  */
2500  rte->relid = enrmd->reliddesc;
2501 
2502  /*
2503  * Build the list of effective column names using user-supplied aliases
2504  * and/or actual column names.
2505  */
2506  tupdesc = ENRMetadataGetTupDesc(enrmd);
2507  rte->eref = makeAlias(refname, NIL);
2508  buildRelationAliases(tupdesc, alias, rte->eref);
2509 
2510  /* Record additional data for ENR, including column type info */
2511  rte->enrname = enrmd->name;
2512  rte->enrtuples = enrmd->enrtuples;
2513  rte->coltypes = NIL;
2514  rte->coltypmods = NIL;
2515  rte->colcollations = NIL;
2516  for (attno = 1; attno <= tupdesc->natts; ++attno)
2517  {
2518  Form_pg_attribute att = TupleDescAttr(tupdesc, attno - 1);
2519 
2520  if (att->attisdropped)
2521  {
2522  /* Record zeroes for a dropped column */
2523  rte->coltypes = lappend_oid(rte->coltypes, InvalidOid);
2524  rte->coltypmods = lappend_int(rte->coltypmods, 0);
2526  }
2527  else
2528  {
2529  /* Let's just make sure we can tell this isn't dropped */
2530  if (att->atttypid == InvalidOid)
2531  elog(ERROR, "atttypid is invalid for non-dropped column in \"%s\"",
2532  rv->relname);
2533  rte->coltypes = lappend_oid(rte->coltypes, att->atttypid);
2534  rte->coltypmods = lappend_int(rte->coltypmods, att->atttypmod);
2536  att->attcollation);
2537  }
2538  }
2539 
2540  /*
2541  * Set flags and access permissions.
2542  *
2543  * ENRs are never checked for access rights, so no need to perform
2544  * addRTEPermissionInfo().
2545  */
2546  rte->lateral = false;
2547  rte->inh = false; /* never true for ENRs */
2548  rte->inFromCl = inFromCl;
2549 
2550  /*
2551  * Add completed RTE to pstate's range table list, so that we know its
2552  * index. But we don't add it to the join list --- caller must do that if
2553  * appropriate.
2554  */
2555  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2556 
2557  /*
2558  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2559  * list --- caller must do that if appropriate.
2560  */
2561  return buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable), NULL,
2562  tupdesc);
2563 }
EphemeralNamedRelationMetadata get_visible_ENR(ParseState *pstate, const char *refname)
Definition: parse_enr.c:26
@ RTE_NAMEDTUPLESTORE
Definition: parsenodes.h:1021
FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:209
TupleDesc ENRMetadataGetTupDesc(EphemeralNamedRelationMetadata enrmd)
@ ENR_NAMED_TUPLESTORE
EphemeralNameRelationType enrtype
char * enrname
Definition: parsenodes.h:1193
Cardinality enrtuples
Definition: parsenodes.h:1194
#define TupleDescAttr(tupdesc, i)
Definition: tupdesc.h:92

References RangeVar::alias, Alias::aliasname, Assert(), buildNSItemFromTupleDesc(), buildRelationAliases(), RangeTblEntry::colcollations, RangeTblEntry::coltypes, RangeTblEntry::coltypmods, elog(), ENR_NAMED_TUPLESTORE, ENRMetadataGetTupDesc(), RangeTblEntry::enrname, RangeTblEntry::enrtuples, EphemeralNamedRelationMetadataData::enrtuples, EphemeralNamedRelationMetadataData::enrtype, RangeTblEntry::eref, ERROR, get_visible_ENR(), RangeTblEntry::inFromCl, RangeTblEntry::inh, InvalidOid, lappend(), lappend_int(), lappend_oid(), RangeTblEntry::lateral, list_length(), makeAlias(), makeNode, EphemeralNamedRelationMetadataData::name, TupleDescData::natts, NIL, ParseState::p_rtable, RangeTblEntry::relid, EphemeralNamedRelationMetadataData::reliddesc, RangeVar::relname, RTE_NAMEDTUPLESTORE, RangeTblEntry::rtekind, and TupleDescAttr.

Referenced by getNSItemForSpecialRelationTypes().

◆ addRangeTableEntryForFunction()

ParseNamespaceItem* addRangeTableEntryForFunction ( ParseState pstate,
List funcnames,
List funcexprs,
List coldeflists,
RangeFunction rangefunc,
bool  lateral,
bool  inFromCl 
)

Definition at line 1734 of file parse_relation.c.

1741 {
1743  Alias *alias = rangefunc->alias;
1744  Alias *eref;
1745  char *aliasname;
1746  int nfuncs = list_length(funcexprs);
1747  TupleDesc *functupdescs;
1748  TupleDesc tupdesc;
1749  ListCell *lc1,
1750  *lc2,
1751  *lc3;
1752  int i;
1753  int j;
1754  int funcno;
1755  int natts,
1756  totalatts;
1757 
1758  Assert(pstate != NULL);
1759 
1760  rte->rtekind = RTE_FUNCTION;
1761  rte->relid = InvalidOid;
1762  rte->subquery = NULL;
1763  rte->functions = NIL; /* we'll fill this list below */
1764  rte->funcordinality = rangefunc->ordinality;
1765  rte->alias = alias;
1766 
1767  /*
1768  * Choose the RTE alias name. We default to using the first function's
1769  * name even when there's more than one; which is maybe arguable but beats
1770  * using something constant like "table".
1771  */
1772  if (alias)
1773  aliasname = alias->aliasname;
1774  else
1775  aliasname = linitial(funcnames);
1776 
1777  eref = makeAlias(aliasname, NIL);
1778  rte->eref = eref;
1779 
1780  /* Process each function ... */
1781  functupdescs = (TupleDesc *) palloc(nfuncs * sizeof(TupleDesc));
1782 
1783  totalatts = 0;
1784  funcno = 0;
1785  forthree(lc1, funcexprs, lc2, funcnames, lc3, coldeflists)
1786  {
1787  Node *funcexpr = (Node *) lfirst(lc1);
1788  char *funcname = (char *) lfirst(lc2);
1789  List *coldeflist = (List *) lfirst(lc3);
1791  TypeFuncClass functypclass;
1792  Oid funcrettype;
1793 
1794  /* Initialize RangeTblFunction node */
1795  rtfunc->funcexpr = funcexpr;
1796  rtfunc->funccolnames = NIL;
1797  rtfunc->funccoltypes = NIL;
1798  rtfunc->funccoltypmods = NIL;
1799  rtfunc->funccolcollations = NIL;
1800  rtfunc->funcparams = NULL; /* not set until planning */
1801 
1802  /*
1803  * Now determine if the function returns a simple or composite type.
1804  */
1805  functypclass = get_expr_result_type(funcexpr,
1806  &funcrettype,
1807  &tupdesc);
1808 
1809  /*
1810  * A coldeflist is required if the function returns RECORD and hasn't
1811  * got a predetermined record type, and is prohibited otherwise. This
1812  * can be a bit confusing, so we expend some effort on delivering a
1813  * relevant error message.
1814  */
1815  if (coldeflist != NIL)
1816  {
1817  switch (functypclass)
1818  {
1819  case TYPEFUNC_RECORD:
1820  /* ok */
1821  break;
1822  case TYPEFUNC_COMPOSITE:
1824 
1825  /*
1826  * If the function's raw result type is RECORD, we must
1827  * have resolved it using its OUT parameters. Otherwise,
1828  * it must have a named composite type.
1829  */
1830  if (exprType(funcexpr) == RECORDOID)
1831  ereport(ERROR,
1832  (errcode(ERRCODE_SYNTAX_ERROR),
1833  errmsg("a column definition list is redundant for a function with OUT parameters"),
1834  parser_errposition(pstate,
1835  exprLocation((Node *) coldeflist))));
1836  else
1837  ereport(ERROR,
1838  (errcode(ERRCODE_SYNTAX_ERROR),
1839  errmsg("a column definition list is redundant for a function returning a named composite type"),
1840  parser_errposition(pstate,
1841  exprLocation((Node *) coldeflist))));
1842  break;
1843  default:
1844  ereport(ERROR,
1845  (errcode(ERRCODE_SYNTAX_ERROR),
1846  errmsg("a column definition list is only allowed for functions returning \"record\""),
1847  parser_errposition(pstate,
1848  exprLocation((Node *) coldeflist))));
1849  break;
1850  }
1851  }
1852  else
1853  {
1854  if (functypclass == TYPEFUNC_RECORD)
1855  ereport(ERROR,
1856  (errcode(ERRCODE_SYNTAX_ERROR),
1857  errmsg("a column definition list is required for functions returning \"record\""),
1858  parser_errposition(pstate, exprLocation(funcexpr))));
1859  }
1860 
1861  if (functypclass == TYPEFUNC_COMPOSITE ||
1862  functypclass == TYPEFUNC_COMPOSITE_DOMAIN)
1863  {
1864  /* Composite data type, e.g. a table's row type */
1865  Assert(tupdesc);
1866  }
1867  else if (functypclass == TYPEFUNC_SCALAR)
1868  {
1869  /* Base data type, i.e. scalar */
1870  tupdesc = CreateTemplateTupleDesc(1);
1871  TupleDescInitEntry(tupdesc,
1872  (AttrNumber) 1,
1874  alias, nfuncs),
1875  funcrettype,
1876  exprTypmod(funcexpr),
1877  0);
1879  (AttrNumber) 1,
1880  exprCollation(funcexpr));
1881  }
1882  else if (functypclass == TYPEFUNC_RECORD)
1883  {
1884  ListCell *col;
1885 
1886  /*
1887  * Use the column definition list to construct a tupdesc and fill
1888  * in the RangeTblFunction's lists. Limit number of columns to
1889  * MaxHeapAttributeNumber, because CheckAttributeNamesTypes will.
1890  */
1891  if (list_length(coldeflist) > MaxHeapAttributeNumber)
1892  ereport(ERROR,
1893  (errcode(ERRCODE_TOO_MANY_COLUMNS),
1894  errmsg("column definition lists can have at most %d entries",
1896  parser_errposition(pstate,
1897  exprLocation((Node *) coldeflist))));
1898  tupdesc = CreateTemplateTupleDesc(list_length(coldeflist));
1899  i = 1;
1900  foreach(col, coldeflist)
1901  {
1902  ColumnDef *n = (ColumnDef *) lfirst(col);
1903  char *attrname;
1904  Oid attrtype;
1905  int32 attrtypmod;
1906  Oid attrcollation;
1907 
1908  attrname = n->colname;
1909  if (n->typeName->setof)
1910  ereport(ERROR,
1911  (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
1912  errmsg("column \"%s\" cannot be declared SETOF",
1913  attrname),
1914  parser_errposition(pstate, n->location)));
1915  typenameTypeIdAndMod(pstate, n->typeName,
1916  &attrtype, &attrtypmod);
1917  attrcollation = GetColumnDefCollation(pstate, n, attrtype);
1918  TupleDescInitEntry(tupdesc,
1919  (AttrNumber) i,
1920  attrname,
1921  attrtype,
1922  attrtypmod,
1923  0);
1925  (AttrNumber) i,
1926  attrcollation);
1927  rtfunc->funccolnames = lappend(rtfunc->funccolnames,
1928  makeString(pstrdup(attrname)));
1929  rtfunc->funccoltypes = lappend_oid(rtfunc->funccoltypes,
1930  attrtype);
1931  rtfunc->funccoltypmods = lappend_int(rtfunc->funccoltypmods,
1932  attrtypmod);
1933  rtfunc->funccolcollations = lappend_oid(rtfunc->funccolcollations,
1934  attrcollation);
1935 
1936  i++;
1937  }
1938 
1939  /*
1940  * Ensure that the coldeflist defines a legal set of names (no
1941  * duplicates, but we needn't worry about system column names) and
1942  * datatypes. Although we mostly can't allow pseudo-types, it
1943  * seems safe to allow RECORD and RECORD[], since values within
1944  * those type classes are self-identifying at runtime, and the
1945  * coldeflist doesn't represent anything that will be visible to
1946  * other sessions.
1947  */
1948  CheckAttributeNamesTypes(tupdesc, RELKIND_COMPOSITE_TYPE,
1950  }
1951  else
1952  ereport(ERROR,
1953  (errcode(ERRCODE_DATATYPE_MISMATCH),
1954  errmsg("function \"%s\" in FROM has unsupported return type %s",
1955  funcname, format_type_be(funcrettype)),
1956  parser_errposition(pstate, exprLocation(funcexpr))));
1957 
1958  /* Finish off the RangeTblFunction and add it to the RTE's list */
1959  rtfunc->funccolcount = tupdesc->natts;
1960  rte->functions = lappend(rte->functions, rtfunc);
1961 
1962  /* Save the tupdesc for use below */
1963  functupdescs[funcno] = tupdesc;
1964  totalatts += tupdesc->natts;
1965  funcno++;
1966  }
1967 
1968  /*
1969  * If there's more than one function, or we want an ordinality column, we
1970  * have to produce a merged tupdesc.
1971  */
1972  if (nfuncs > 1 || rangefunc->ordinality)
1973  {
1974  if (rangefunc->ordinality)
1975  totalatts++;
1976 
1977  /* Disallow more columns than will fit in a tuple */
1978  if (totalatts > MaxTupleAttributeNumber)
1979  ereport(ERROR,
1980  (errcode(ERRCODE_TOO_MANY_COLUMNS),
1981  errmsg("functions in FROM can return at most %d columns",
1983  parser_errposition(pstate,
1984  exprLocation((Node *) funcexprs))));
1985 
1986  /* Merge the tuple descs of each function into a composite one */
1987  tupdesc = CreateTemplateTupleDesc(totalatts);
1988  natts = 0;
1989  for (i = 0; i < nfuncs; i++)
1990  {
1991  for (j = 1; j <= functupdescs[i]->natts; j++)
1992  TupleDescCopyEntry(tupdesc, ++natts, functupdescs[i], j);
1993  }
1994 
1995  /* Add the ordinality column if needed */
1996  if (rangefunc->ordinality)
1997  {
1998  TupleDescInitEntry(tupdesc,
1999  (AttrNumber) ++natts,
2000  "ordinality",
2001  INT8OID,
2002  -1,
2003  0);
2004  /* no need to set collation */
2005  }
2006 
2007  Assert(natts == totalatts);
2008  }
2009  else
2010  {
2011  /* We can just use the single function's tupdesc as-is */
2012  tupdesc = functupdescs[0];
2013  }
2014 
2015  /* Use the tupdesc while assigning column aliases for the RTE */
2016  buildRelationAliases(tupdesc, alias, eref);
2017 
2018  /*
2019  * Set flags and access permissions.
2020  *
2021  * Functions are never checked for access rights (at least, not by
2022  * ExecCheckPermissions()), so no need to perform addRTEPermissionInfo().
2023  */
2024  rte->lateral = lateral;
2025  rte->inh = false; /* never true for functions */
2026  rte->inFromCl = inFromCl;
2027 
2028  /*
2029  * Add completed RTE to pstate's range table list, so that we know its
2030  * index. But we don't add it to the join list --- caller must do that if
2031  * appropriate.
2032  */
2033  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2034 
2035  /*
2036  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2037  * list --- caller must do that if appropriate.
2038  */
2039  return buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable), NULL,
2040  tupdesc);
2041 }
int16 AttrNumber
Definition: attnum.h:21
signed int int32
Definition: c.h:478
char * format_type_be(Oid type_oid)
Definition: format_type.c:339
TypeFuncClass get_expr_result_type(Node *expr, Oid *resultTypeId, TupleDesc *resultTupleDesc)
Definition: funcapi.c:292
TypeFuncClass
Definition: funcapi.h:147
@ TYPEFUNC_SCALAR
Definition: funcapi.h:148
@ TYPEFUNC_COMPOSITE
Definition: funcapi.h:149
@ TYPEFUNC_RECORD
Definition: funcapi.h:151
@ TYPEFUNC_COMPOSITE_DOMAIN
Definition: funcapi.h:150
void CheckAttributeNamesTypes(TupleDesc tupdesc, char relkind, int flags)
Definition: heap.c:455
#define CHKATYPE_ANYRECORD
Definition: heap.h:24
#define MaxTupleAttributeNumber
Definition: htup_details.h:34
#define MaxHeapAttributeNumber
Definition: htup_details.h:48
#define funcname
Definition: indent_codes.h:69
int j
Definition: isn.c:74
char * pstrdup(const char *in)
Definition: mcxt.c:1644
void * palloc(Size size)
Definition: mcxt.c:1226
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:43
int32 exprTypmod(const Node *expr)
Definition: nodeFuncs.c:284
Oid exprCollation(const Node *expr)
Definition: nodeFuncs.c:788
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1314
static char * chooseScalarFunctionAlias(Node *funcexpr, char *funcname, Alias *alias, int nfuncs)
void typenameTypeIdAndMod(ParseState *pstate, const TypeName *typeName, Oid *typeid_p, int32 *typmod_p)
Definition: parse_type.c:310
Oid GetColumnDefCollation(ParseState *pstate, ColumnDef *coldef, Oid typeOid)
Definition: parse_type.c:540
@ RTE_FUNCTION
Definition: parsenodes.h:1017
#define forthree(cell1, list1, cell2, list2, cell3, list3)
Definition: pg_list.h:512
#define linitial(l)
Definition: pg_list.h:178
unsigned int Oid
Definition: postgres_ext.h:31
int location
Definition: parsenodes.h:740
char * colname
Definition: parsenodes.h:721
TypeName * typeName
Definition: parsenodes.h:722
Definition: pg_list.h:54
Definition: nodes.h:129
Alias * alias
Definition: parsenodes.h:642
bool funcordinality
Definition: parsenodes.h:1149
Query * subquery
Definition: parsenodes.h:1081
List * functions
Definition: parsenodes.h:1148
bool setof
Definition: parsenodes.h:268
TupleDesc CreateTemplateTupleDesc(int natts)
Definition: tupdesc.c:45
void TupleDescInitEntryCollation(TupleDesc desc, AttrNumber attributeNumber, Oid collationid)
Definition: tupdesc.c:767
void TupleDescInitEntry(TupleDesc desc, AttrNumber attributeNumber, const char *attributeName, Oid oidtypeid, int32 typmod, int attdim)
Definition: tupdesc.c:583
void TupleDescCopyEntry(TupleDesc dst, AttrNumber dstAttno, TupleDesc src, AttrNumber srcAttno)
Definition: tupdesc.c:267

References RangeFunction::alias, RangeTblEntry::alias, Alias::aliasname, Assert(), buildNSItemFromTupleDesc(), buildRelationAliases(), CheckAttributeNamesTypes(), CHKATYPE_ANYRECORD, chooseScalarFunctionAlias(), ColumnDef::colname, CreateTemplateTupleDesc(), RangeTblEntry::eref, ereport, errcode(), errmsg(), ERROR, exprCollation(), exprLocation(), exprType(), exprTypmod(), format_type_be(), forthree, RangeTblFunction::funcexpr, funcname, RangeTblEntry::funcordinality, RangeTblEntry::functions, get_expr_result_type(), GetColumnDefCollation(), i, RangeTblEntry::inFromCl, RangeTblEntry::inh, InvalidOid, j, lappend(), lappend_int(), lappend_oid(), RangeTblEntry::lateral, lfirst, linitial, list_length(), ColumnDef::location, makeAlias(), makeNode, makeString(), MaxHeapAttributeNumber, MaxTupleAttributeNumber, TupleDescData::natts, NIL, RangeFunction::ordinality, ParseState::p_rtable, palloc(), parser_errposition(), pstrdup(), RangeTblEntry::relid, RTE_FUNCTION, RangeTblEntry::rtekind, TypeName::setof, RangeTblEntry::subquery, TupleDescCopyEntry(), TupleDescInitEntry(), TupleDescInitEntryCollation(), TYPEFUNC_COMPOSITE, TYPEFUNC_COMPOSITE_DOMAIN, TYPEFUNC_RECORD, TYPEFUNC_SCALAR, ColumnDef::typeName, and typenameTypeIdAndMod().

Referenced by transformRangeFunction().

◆ addRangeTableEntryForJoin()

ParseNamespaceItem* addRangeTableEntryForJoin ( ParseState pstate,
List colnames,
ParseNamespaceColumn nscolumns,
JoinType  jointype,
int  nummergedcols,
List aliasvars,
List leftcols,
List rightcols,
Alias join_using_alias,
Alias alias,
bool  inFromCl 
)

Definition at line 2219 of file parse_relation.c.

2230 {
2232  Alias *eref;
2233  int numaliases;
2234  ParseNamespaceItem *nsitem;
2235 
2236  Assert(pstate != NULL);
2237 
2238  /*
2239  * Fail if join has too many columns --- we must be able to reference any
2240  * of the columns with an AttrNumber.
2241  */
2242  if (list_length(aliasvars) > MaxAttrNumber)
2243  ereport(ERROR,
2244  (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
2245  errmsg("joins can have at most %d columns",
2246  MaxAttrNumber)));
2247 
2248  rte->rtekind = RTE_JOIN;
2249  rte->relid = InvalidOid;
2250  rte->subquery = NULL;
2251  rte->jointype = jointype;
2252  rte->joinmergedcols = nummergedcols;
2253  rte->joinaliasvars = aliasvars;
2254  rte->joinleftcols = leftcols;
2255  rte->joinrightcols = rightcols;
2256  rte->join_using_alias = join_using_alias;
2257  rte->alias = alias;
2258 
2259  eref = alias ? copyObject(alias) : makeAlias("unnamed_join", NIL);
2260  numaliases = list_length(eref->colnames);
2261 
2262  /* fill in any unspecified alias columns */
2263  if (numaliases < list_length(colnames))
2264  eref->colnames = list_concat(eref->colnames,
2265  list_copy_tail(colnames, numaliases));
2266 
2267  if (numaliases > list_length(colnames))
2268  ereport(ERROR,
2269  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2270  errmsg("join expression \"%s\" has %d columns available but %d columns specified",
2271  eref->aliasname, list_length(colnames), numaliases)));
2272 
2273  rte->eref = eref;
2274 
2275  /*
2276  * Set flags and access permissions.
2277  *
2278  * Joins are never checked for access rights, so no need to perform
2279  * addRTEPermissionInfo().
2280  */
2281  rte->lateral = false;
2282  rte->inh = false; /* never true for joins */
2283  rte->inFromCl = inFromCl;
2284 
2285  /*
2286  * Add completed RTE to pstate's range table list, so that we know its
2287  * index. But we don't add it to the join list --- caller must do that if
2288  * appropriate.
2289  */
2290  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2291 
2292  /*
2293  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2294  * list --- caller must do that if appropriate.
2295  */
2296  nsitem = (ParseNamespaceItem *) palloc(sizeof(ParseNamespaceItem));
2297  nsitem->p_names = rte->eref;
2298  nsitem->p_rte = rte;
2299  nsitem->p_perminfo = NULL;
2300  nsitem->p_rtindex = list_length(pstate->p_rtable);
2301  nsitem->p_nscolumns = nscolumns;
2302  /* set default visibility flags; might get changed later */
2303  nsitem->p_rel_visible = true;
2304  nsitem->p_cols_visible = true;
2305  nsitem->p_lateral_only = false;
2306  nsitem->p_lateral_ok = true;
2307 
2308  return nsitem;
2309 }
#define MaxAttrNumber
Definition: attnum.h:24
List * list_copy_tail(const List *oldlist, int nskip)
Definition: list.c:1612
List * list_concat(List *list1, const List *list2)
Definition: list.c:560
@ RTE_JOIN
Definition: parsenodes.h:1016
RangeTblEntry * p_rte
Definition: parse_node.h:286
RTEPermissionInfo * p_perminfo
Definition: parse_node.h:288
Alias * join_using_alias
Definition: parsenodes.h:1138
List * joinrightcols
Definition: parsenodes.h:1131
List * joinaliasvars
Definition: parsenodes.h:1129
JoinType jointype
Definition: parsenodes.h:1127
List * joinleftcols
Definition: parsenodes.h:1130

References RangeTblEntry::alias, Alias::aliasname, Assert(), Alias::colnames, copyObject, RangeTblEntry::eref, ereport, errcode(), errmsg(), ERROR, RangeTblEntry::inFromCl, RangeTblEntry::inh, InvalidOid, RangeTblEntry::join_using_alias, RangeTblEntry::joinaliasvars, RangeTblEntry::joinleftcols, RangeTblEntry::joinmergedcols, RangeTblEntry::joinrightcols, RangeTblEntry::jointype, lappend(), RangeTblEntry::lateral, list_concat(), list_copy_tail(), list_length(), makeAlias(), makeNode, MaxAttrNumber, NIL, ParseNamespaceItem::p_cols_visible, ParseNamespaceItem::p_lateral_ok, ParseNamespaceItem::p_lateral_only, ParseNamespaceItem::p_names, ParseNamespaceItem::p_nscolumns, ParseNamespaceItem::p_perminfo, ParseNamespaceItem::p_rel_visible, ParseState::p_rtable, ParseNamespaceItem::p_rte, ParseNamespaceItem::p_rtindex, palloc(), RangeTblEntry::relid, RTE_JOIN, RangeTblEntry::rtekind, and RangeTblEntry::subquery.

Referenced by transformFromClauseItem(), and transformSetOperationStmt().

◆ addRangeTableEntryForRelation()

ParseNamespaceItem* addRangeTableEntryForRelation ( ParseState pstate,
Relation  rel,
int  lockmode,
Alias alias,
bool  inh,
bool  inFromCl 
)

Definition at line 1566 of file parse_relation.c.

1572 {
1574  RTEPermissionInfo *perminfo;
1575  char *refname = alias ? alias->aliasname : RelationGetRelationName(rel);
1576 
1577  Assert(pstate != NULL);
1578 
1579  Assert(lockmode == AccessShareLock ||
1580  lockmode == RowShareLock ||
1581  lockmode == RowExclusiveLock);
1582  Assert(CheckRelationLockedByMe(rel, lockmode, true));
1583 
1584  rte->rtekind = RTE_RELATION;
1585  rte->alias = alias;
1586  rte->relid = RelationGetRelid(rel);
1587  rte->relkind = rel->rd_rel->relkind;
1588  rte->rellockmode = lockmode;
1589 
1590  /*
1591  * Build the list of effective column names using user-supplied aliases
1592  * and/or actual column names.
1593  */
1594  rte->eref = makeAlias(refname, NIL);
1595  buildRelationAliases(rel->rd_att, alias, rte->eref);
1596 
1597  /*
1598  * Set flags and initialize access permissions.
1599  *
1600  * The initial default on access checks is always check-for-READ-access,
1601  * which is the right thing for all except target tables.
1602  */
1603  rte->lateral = false;
1604  rte->inh = inh;
1605  rte->inFromCl = inFromCl;
1606 
1607  perminfo = addRTEPermissionInfo(&pstate->p_rteperminfos, rte);
1608  perminfo->requiredPerms = ACL_SELECT;
1609 
1610  /*
1611  * Add completed RTE to pstate's range table list, so that we know its
1612  * index. But we don't add it to the join list --- caller must do that if
1613  * appropriate.
1614  */
1615  pstate->p_rtable = lappend(pstate->p_rtable, rte);
1616 
1617  /*
1618  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
1619  * list --- caller must do that if appropriate.
1620  */
1621  return buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable),
1622  perminfo, rel->rd_att);
1623 }
bool CheckRelationLockedByMe(Relation relation, LOCKMODE lockmode, bool orstronger)
Definition: lmgr.c:331
#define RowExclusiveLock
Definition: lockdefs.h:38
#define RelationGetRelationName(relation)
Definition: rel.h:538

References AccessShareLock, ACL_SELECT, addRTEPermissionInfo(), RangeTblEntry::alias, Alias::aliasname, Assert(), buildNSItemFromTupleDesc(), buildRelationAliases(), CheckRelationLockedByMe(), RangeTblEntry::eref, RangeTblEntry::inFromCl, RangeTblEntry::inh, lappend(), RangeTblEntry::lateral, list_length(), makeAlias(), makeNode, NIL, ParseState::p_rtable, ParseState::p_rteperminfos, RelationData::rd_att, RelationData::rd_rel, RelationGetRelationName, RelationGetRelid, RangeTblEntry::relid, RangeTblEntry::relkind, RangeTblEntry::rellockmode, RTEPermissionInfo::requiredPerms, RowExclusiveLock, RowShareLock, RTE_RELATION, and RangeTblEntry::rtekind.

Referenced by AddRelationNewConstraints(), AlterPolicy(), copy_table(), CreatePolicy(), CreateTriggerFiringOn(), DefineRelation(), DoCopy(), rewriteTargetView(), setTargetTable(), test_rls_hooks_permissive(), test_rls_hooks_restrictive(), transformAlterTableStmt(), transformIndexStmt(), transformOnConflictClause(), transformPartitionSpec(), TransformPubWhereClauses(), transformRuleStmt(), and transformStatsStmt().

◆ addRangeTableEntryForSubquery()

ParseNamespaceItem* addRangeTableEntryForSubquery ( ParseState pstate,
Query subquery,
Alias alias,
bool  lateral,
bool  inFromCl 
)

Definition at line 1637 of file parse_relation.c.

1642 {
1644  Alias *eref;
1645  int numaliases;
1646  List *coltypes,
1647  *coltypmods,
1648  *colcollations;
1649  int varattno;
1650  ListCell *tlistitem;
1651  ParseNamespaceItem *nsitem;
1652 
1653  Assert(pstate != NULL);
1654 
1655  rte->rtekind = RTE_SUBQUERY;
1656  rte->subquery = subquery;
1657  rte->alias = alias;
1658 
1659  eref = alias ? copyObject(alias) : makeAlias("unnamed_subquery", NIL);
1660  numaliases = list_length(eref->colnames);
1661 
1662  /* fill in any unspecified alias columns, and extract column type info */
1663  coltypes = coltypmods = colcollations = NIL;
1664  varattno = 0;
1665  foreach(tlistitem, subquery->targetList)
1666  {
1667  TargetEntry *te = (TargetEntry *) lfirst(tlistitem);
1668 
1669  if (te->resjunk)
1670  continue;
1671  varattno++;
1672  Assert(varattno == te->resno);
1673  if (varattno > numaliases)
1674  {
1675  char *attrname;
1676 
1677  attrname = pstrdup(te->resname);
1678  eref->colnames = lappend(eref->colnames, makeString(attrname));
1679  }
1680  coltypes = lappend_oid(coltypes,
1681  exprType((Node *) te->expr));
1682  coltypmods = lappend_int(coltypmods,
1683  exprTypmod((Node *) te->expr));
1684  colcollations = lappend_oid(colcollations,
1685  exprCollation((Node *) te->expr));
1686  }
1687  if (varattno < numaliases)
1688  ereport(ERROR,
1689  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
1690  errmsg("table \"%s\" has %d columns available but %d columns specified",
1691  eref->aliasname, varattno, numaliases)));
1692 
1693  rte->eref = eref;
1694 
1695  /*
1696  * Set flags.
1697  *
1698  * Subqueries are never checked for access rights, so no need to perform
1699  * addRTEPermissionInfo().
1700  */
1701  rte->lateral = lateral;
1702  rte->inh = false; /* never true for subqueries */
1703  rte->inFromCl = inFromCl;
1704 
1705  /*
1706  * Add completed RTE to pstate's range table list, so that we know its
1707  * index. But we don't add it to the join list --- caller must do that if
1708  * appropriate.
1709  */
1710  pstate->p_rtable = lappend(pstate->p_rtable, rte);
1711 
1712  /*
1713  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
1714  * list --- caller must do that if appropriate.
1715  */
1716  nsitem = buildNSItemFromLists(rte, list_length(pstate->p_rtable),
1717  coltypes, coltypmods, colcollations);
1718 
1719  /*
1720  * Mark it visible as a relation name only if it had a user-written alias.
1721  */
1722  nsitem->p_rel_visible = (alias != NULL);
1723 
1724  return nsitem;
1725 }
@ RTE_SUBQUERY
Definition: parsenodes.h:1015
List * targetList
Definition: parsenodes.h:189
Expr * expr
Definition: primnodes.h:1886
AttrNumber resno
Definition: primnodes.h:1888

References RangeTblEntry::alias, Alias::aliasname, Assert(), buildNSItemFromLists(), Alias::colnames, copyObject, RangeTblEntry::eref, ereport, errcode(), errmsg(), ERROR, TargetEntry::expr, exprCollation(), exprType(), exprTypmod(), RangeTblEntry::inFromCl, RangeTblEntry::inh, lappend(), lappend_int(), lappend_oid(), RangeTblEntry::lateral, lfirst, list_length(), makeAlias(), makeNode, makeString(), NIL, ParseNamespaceItem::p_rel_visible, ParseState::p_rtable, pstrdup(), TargetEntry::resno, RTE_SUBQUERY, RangeTblEntry::rtekind, RangeTblEntry::subquery, and Query::targetList.

Referenced by convert_ANY_sublink_to_join(), transformInsertStmt(), transformRangeSubselect(), and transformSetOperationTree().

◆ addRangeTableEntryForTableFunc()

ParseNamespaceItem* addRangeTableEntryForTableFunc ( ParseState pstate,
TableFunc tf,
Alias alias,
bool  lateral,
bool  inFromCl 
)

Definition at line 2050 of file parse_relation.c.

2055 {
2057  char *refname;
2058  Alias *eref;
2059  int numaliases;
2060 
2061  Assert(pstate != NULL);
2062 
2063  /* Disallow more columns than will fit in a tuple */
2064  if (list_length(tf->colnames) > MaxTupleAttributeNumber)
2065  ereport(ERROR,
2066  (errcode(ERRCODE_TOO_MANY_COLUMNS),
2067  errmsg("functions in FROM can return at most %d columns",
2069  parser_errposition(pstate,
2070  exprLocation((Node *) tf))));
2071  Assert(list_length(tf->coltypes) == list_length(tf->colnames));
2072  Assert(list_length(tf->coltypmods) == list_length(tf->colnames));
2073  Assert(list_length(tf->colcollations) == list_length(tf->colnames));
2074 
2075  refname = alias ? alias->aliasname : pstrdup("xmltable");
2076 
2077  rte->rtekind = RTE_TABLEFUNC;
2078  rte->relid = InvalidOid;
2079  rte->subquery = NULL;
2080  rte->tablefunc = tf;
2081  rte->coltypes = tf->coltypes;
2082  rte->coltypmods = tf->coltypmods;
2083  rte->colcollations = tf->colcollations;
2084  rte->alias = alias;
2085 
2086  eref = alias ? copyObject(alias) : makeAlias(refname, NIL);
2087  numaliases = list_length(eref->colnames);
2088 
2089  /* fill in any unspecified alias columns */
2090  if (numaliases < list_length(tf->colnames))
2091  eref->colnames = list_concat(eref->colnames,
2092  list_copy_tail(tf->colnames, numaliases));
2093 
2094  if (numaliases > list_length(tf->colnames))
2095  ereport(ERROR,
2096  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2097  errmsg("%s function has %d columns available but %d columns specified",
2098  "XMLTABLE",
2099  list_length(tf->colnames), numaliases)));
2100 
2101  rte->eref = eref;
2102 
2103  /*
2104  * Set flags and access permissions.
2105  *
2106  * Tablefuncs are never checked for access rights (at least, not by
2107  * ExecCheckPermissions()), so no need to perform addRTEPermissionInfo().
2108  */
2109  rte->lateral = lateral;
2110  rte->inh = false; /* never true for tablefunc RTEs */
2111  rte->inFromCl = inFromCl;
2112 
2113  /*
2114  * Add completed RTE to pstate's range table list, so that we know its
2115  * index. But we don't add it to the join list --- caller must do that if
2116  * appropriate.
2117  */
2118  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2119 
2120  /*
2121  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2122  * list --- caller must do that if appropriate.
2123  */
2124  return buildNSItemFromLists(rte, list_length(pstate->p_rtable),
2125  rte->coltypes, rte->coltypmods,
2126  rte->colcollations);
2127 }
@ RTE_TABLEFUNC
Definition: parsenodes.h:1018
TableFunc * tablefunc
Definition: parsenodes.h:1154

References RangeTblEntry::alias, Alias::aliasname, Assert(), buildNSItemFromLists(), RangeTblEntry::colcollations, Alias::colnames, RangeTblEntry::coltypes, RangeTblEntry::coltypmods, copyObject, RangeTblEntry::eref, ereport, errcode(), errmsg(), ERROR, exprLocation(), RangeTblEntry::inFromCl, RangeTblEntry::inh, InvalidOid, lappend(), RangeTblEntry::lateral, list_concat(), list_copy_tail(), list_length(), makeAlias(), makeNode, MaxTupleAttributeNumber, NIL, ParseState::p_rtable, parser_errposition(), pstrdup(), RangeTblEntry::relid, RTE_TABLEFUNC, RangeTblEntry::rtekind, RangeTblEntry::subquery, and RangeTblEntry::tablefunc.

Referenced by transformRangeTableFunc().

◆ addRangeTableEntryForValues()

ParseNamespaceItem* addRangeTableEntryForValues ( ParseState pstate,
List exprs,
List coltypes,
List coltypmods,
List colcollations,
Alias alias,
bool  lateral,
bool  inFromCl 
)

Definition at line 2136 of file parse_relation.c.

2144 {
2146  char *refname = alias ? alias->aliasname : pstrdup("*VALUES*");
2147  Alias *eref;
2148  int numaliases;
2149  int numcolumns;
2150 
2151  Assert(pstate != NULL);
2152 
2153  rte->rtekind = RTE_VALUES;
2154  rte->relid = InvalidOid;
2155  rte->subquery = NULL;
2156  rte->values_lists = exprs;
2157  rte->coltypes = coltypes;
2158  rte->coltypmods = coltypmods;
2159  rte->colcollations = colcollations;
2160  rte->alias = alias;
2161 
2162  eref = alias ? copyObject(alias) : makeAlias(refname, NIL);
2163 
2164  /* fill in any unspecified alias columns */
2165  numcolumns = list_length((List *) linitial(exprs));
2166  numaliases = list_length(eref->colnames);
2167  while (numaliases < numcolumns)
2168  {
2169  char attrname[64];
2170 
2171  numaliases++;
2172  snprintf(attrname, sizeof(attrname), "column%d", numaliases);
2173  eref->colnames = lappend(eref->colnames,
2174  makeString(pstrdup(attrname)));
2175  }
2176  if (numcolumns < numaliases)
2177  ereport(ERROR,
2178  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2179  errmsg("VALUES lists \"%s\" have %d columns available but %d columns specified",
2180  refname, numcolumns, numaliases)));
2181 
2182  rte->eref = eref;
2183 
2184  /*
2185  * Set flags and access permissions.
2186  *
2187  * Subqueries are never checked for access rights, so no need to perform
2188  * addRTEPermissionInfo().
2189  */
2190  rte->lateral = lateral;
2191  rte->inh = false; /* never true for values RTEs */
2192  rte->inFromCl = inFromCl;
2193 
2194  /*
2195  * Add completed RTE to pstate's range table list, so that we know its
2196  * index. But we don't add it to the join list --- caller must do that if
2197  * appropriate.
2198  */
2199  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2200 
2201  /*
2202  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2203  * list --- caller must do that if appropriate.
2204  */
2205  return buildNSItemFromLists(rte, list_length(pstate->p_rtable),
2206  rte->coltypes, rte->coltypmods,
2207  rte->colcollations);
2208 }
@ RTE_VALUES
Definition: parsenodes.h:1019
#define snprintf
Definition: port.h:238
List * values_lists
Definition: parsenodes.h:1159

References RangeTblEntry::alias, Alias::aliasname, Assert(), buildNSItemFromLists(), RangeTblEntry::colcollations, Alias::colnames, RangeTblEntry::coltypes, RangeTblEntry::coltypmods, copyObject, RangeTblEntry::eref, ereport, errcode(), errmsg(), ERROR, RangeTblEntry::inFromCl, RangeTblEntry::inh, InvalidOid, lappend(), RangeTblEntry::lateral, linitial, list_length(), makeAlias(), makeNode, makeString(), NIL, ParseState::p_rtable, pstrdup(), RangeTblEntry::relid, RTE_VALUES, RangeTblEntry::rtekind, snprintf, RangeTblEntry::subquery, and RangeTblEntry::values_lists.

Referenced by transformValuesClause().

◆ addRTEPermissionInfo()

RTEPermissionInfo* addRTEPermissionInfo ( List **  rteperminfos,
RangeTblEntry rte 
)

Definition at line 3870 of file parse_relation.c.

3871 {
3872  RTEPermissionInfo *perminfo;
3873 
3874  Assert(OidIsValid(rte->relid));
3875  Assert(rte->perminfoindex == 0);
3876 
3877  /* Nope, so make one and add to the list. */
3878  perminfo = makeNode(RTEPermissionInfo);
3879  perminfo->relid = rte->relid;
3880  perminfo->inh = rte->inh;
3881  /* Other information is set by fetching the node as and where needed. */
3882 
3883  *rteperminfos = lappend(*rteperminfos, perminfo);
3884 
3885  /* Note its index (1-based!) */
3886  rte->perminfoindex = list_length(*rteperminfos);
3887 
3888  return perminfo;
3889 }
#define OidIsValid(objectId)
Definition: c.h:759
Index perminfoindex
Definition: parsenodes.h:1076

References Assert(), RangeTblEntry::inh, RTEPermissionInfo::inh, lappend(), list_length(), makeNode, OidIsValid, RangeTblEntry::perminfoindex, RangeTblEntry::relid, and RTEPermissionInfo::relid.

Referenced by add_rte_to_flat_rtable(), addRangeTableEntry(), addRangeTableEntryForRelation(), create_edata_for_relation(), create_estate_for_relation(), plan_cluster_use_sort(), plan_create_index_workers(), and rewriteTargetView().

◆ attnameAttNum()

int attnameAttNum ( Relation  rd,
const char *  attname,
bool  sysColOK 
)

Definition at line 3479 of file parse_relation.c.

3480 {
3481  int i;
3482 
3483  for (i = 0; i < RelationGetNumberOfAttributes(rd); i++)
3484  {
3486 
3487  if (namestrcmp(&(att->attname), attname) == 0 && !att->attisdropped)
3488  return i + 1;
3489  }
3490 
3491  if (sysColOK)
3492  {
3494  return i;
3495  }
3496 
3497  /* on failure */
3498  return InvalidAttrNumber;
3499 }
#define InvalidAttrNumber
Definition: attnum.h:23
int namestrcmp(Name name, const char *str)
Definition: name.c:247
static int specialAttNum(const char *attname)
NameData attname
Definition: pg_attribute.h:41
#define RelationGetNumberOfAttributes(relation)
Definition: rel.h:510

References attname, i, InvalidAttrNumber, namestrcmp(), RelationData::rd_att, RelationGetNumberOfAttributes, specialAttNum(), and TupleDescAttr.

Referenced by checkInsertTargets(), CreateTriggerFiringOn(), do_analyze_rel(), and transformUpdateTargetList().

◆ attnumAttName()

const NameData* attnumAttName ( Relation  rd,
int  attid 
)

Definition at line 3529 of file parse_relation.c.

3530 {
3531  if (attid <= 0)
3532  {
3533  const FormData_pg_attribute *sysatt;
3534 
3535  sysatt = SystemAttributeDefinition(attid);
3536  return &sysatt->attname;
3537  }
3538  if (attid > rd->rd_att->natts)
3539  elog(ERROR, "invalid attribute number %d", attid);
3540  return &TupleDescAttr(rd->rd_att, attid - 1)->attname;
3541 }
const FormData_pg_attribute * SystemAttributeDefinition(AttrNumber attno)
Definition: heap.c:239
FormData_pg_attribute
Definition: pg_attribute.h:193

References elog(), ERROR, FormData_pg_attribute, TupleDescData::natts, RelationData::rd_att, SystemAttributeDefinition(), and TupleDescAttr.

Referenced by transformFkeyGetPrimaryKey().

◆ attnumCollationId()

Oid attnumCollationId ( Relation  rd,
int  attid 
)

Definition at line 3571 of file parse_relation.c.

3572 {
3573  if (attid <= 0)
3574  {
3575  /* All system attributes are of noncollatable types. */
3576  return InvalidOid;
3577  }
3578  if (attid > rd->rd_att->natts)
3579  elog(ERROR, "invalid attribute number %d", attid);
3580  return TupleDescAttr(rd->rd_att, attid - 1)->attcollation;
3581 }

References elog(), ERROR, InvalidOid, TupleDescData::natts, RelationData::rd_att, and TupleDescAttr.

◆ attnumTypeId()

Oid attnumTypeId ( Relation  rd,
int  attid 
)

Definition at line 3551 of file parse_relation.c.

3552 {
3553  if (attid <= 0)
3554  {
3555  const FormData_pg_attribute *sysatt;
3556 
3557  sysatt = SystemAttributeDefinition(attid);
3558  return sysatt->atttypid;
3559  }
3560  if (attid > rd->rd_att->natts)
3561  elog(ERROR, "invalid attribute number %d", attid);
3562  return TupleDescAttr(rd->rd_att, attid - 1)->atttypid;
3563 }

References elog(), ERROR, FormData_pg_attribute, TupleDescData::natts, RelationData::rd_att, SystemAttributeDefinition(), and TupleDescAttr.

Referenced by transformAssignedExpr(), and transformFkeyGetPrimaryKey().

◆ buildNSItemFromLists()

static ParseNamespaceItem* buildNSItemFromLists ( RangeTblEntry rte,
Index  rtindex,
List coltypes,
List coltypmods,
List colcollations 
)
static

Definition at line 1354 of file parse_relation.c.

1356 {
1357  ParseNamespaceItem *nsitem;
1358  ParseNamespaceColumn *nscolumns;
1359  int maxattrs = list_length(coltypes);
1360  int varattno;
1361  ListCell *lct;
1362  ListCell *lcm;
1363  ListCell *lcc;
1364 
1365  /* colnames must have the same number of entries as the nsitem */
1366  Assert(maxattrs == list_length(rte->eref->colnames));
1367 
1368  Assert(maxattrs == list_length(coltypmods));
1369  Assert(maxattrs == list_length(colcollations));
1370 
1371  /* extract per-column data from the lists */
1372  nscolumns = (ParseNamespaceColumn *)
1373  palloc0(maxattrs * sizeof(ParseNamespaceColumn));
1374 
1375  varattno = 0;
1376  forthree(lct, coltypes,
1377  lcm, coltypmods,
1378  lcc, colcollations)
1379  {
1380  nscolumns[varattno].p_varno = rtindex;
1381  nscolumns[varattno].p_varattno = varattno + 1;
1382  nscolumns[varattno].p_vartype = lfirst_oid(lct);
1383  nscolumns[varattno].p_vartypmod = lfirst_int(lcm);
1384  nscolumns[varattno].p_varcollid = lfirst_oid(lcc);
1385  nscolumns[varattno].p_varnosyn = rtindex;
1386  nscolumns[varattno].p_varattnosyn = varattno + 1;
1387  varattno++;
1388  }
1389 
1390  /* ... and build the nsitem */
1391  nsitem = (ParseNamespaceItem *) palloc(sizeof(ParseNamespaceItem));
1392  nsitem->p_names = rte->eref;
1393  nsitem->p_rte = rte;
1394  nsitem->p_rtindex = rtindex;
1395  nsitem->p_nscolumns = nscolumns;
1396  /* set default visibility flags; might get changed later */
1397  nsitem->p_rel_visible = true;
1398  nsitem->p_cols_visible = true;
1399  nsitem->p_lateral_only = false;
1400  nsitem->p_lateral_ok = true;
1401 
1402  return nsitem;
1403 }
void * palloc0(Size size)
Definition: mcxt.c:1257
#define lfirst_int(lc)
Definition: pg_list.h:173
#define lfirst_oid(lc)
Definition: pg_list.h:174
AttrNumber p_varattno
Definition: parse_node.h:321
AttrNumber p_varattnosyn
Definition: parse_node.h:326

References Assert(), Alias::colnames, RangeTblEntry::eref, forthree, lfirst_int, lfirst_oid, list_length(), ParseNamespaceItem::p_cols_visible, ParseNamespaceItem::p_lateral_ok, ParseNamespaceItem::p_lateral_only, ParseNamespaceItem::p_names, ParseNamespaceItem::p_nscolumns, ParseNamespaceItem::p_rel_visible, ParseNamespaceItem::p_rte, ParseNamespaceItem::p_rtindex, ParseNamespaceColumn::p_varattno, ParseNamespaceColumn::p_varattnosyn, ParseNamespaceColumn::p_varcollid, ParseNamespaceColumn::p_varno, ParseNamespaceColumn::p_varnosyn, ParseNamespaceColumn::p_vartype, ParseNamespaceColumn::p_vartypmod, palloc(), and palloc0().

Referenced by addRangeTableEntryForCTE(), addRangeTableEntryForSubquery(), addRangeTableEntryForTableFunc(), and addRangeTableEntryForValues().

◆ buildNSItemFromTupleDesc()

static ParseNamespaceItem* buildNSItemFromTupleDesc ( RangeTblEntry rte,
Index  rtindex,
RTEPermissionInfo perminfo,
TupleDesc  tupdesc 
)
static

Definition at line 1294 of file parse_relation.c.

1297 {
1298  ParseNamespaceItem *nsitem;
1299  ParseNamespaceColumn *nscolumns;
1300  int maxattrs = tupdesc->natts;
1301  int varattno;
1302 
1303  /* colnames must have the same number of entries as the nsitem */
1304  Assert(maxattrs == list_length(rte->eref->colnames));
1305 
1306  /* extract per-column data from the tupdesc */
1307  nscolumns = (ParseNamespaceColumn *)
1308  palloc0(maxattrs * sizeof(ParseNamespaceColumn));
1309 
1310  for (varattno = 0; varattno < maxattrs; varattno++)
1311  {
1312  Form_pg_attribute attr = TupleDescAttr(tupdesc, varattno);
1313 
1314  /* For a dropped column, just leave the entry as zeroes */
1315  if (attr->attisdropped)
1316  continue;
1317 
1318  nscolumns[varattno].p_varno = rtindex;
1319  nscolumns[varattno].p_varattno = varattno + 1;
1320  nscolumns[varattno].p_vartype = attr->atttypid;
1321  nscolumns[varattno].p_vartypmod = attr->atttypmod;
1322  nscolumns[varattno].p_varcollid = attr->attcollation;
1323  nscolumns[varattno].p_varnosyn = rtindex;
1324  nscolumns[varattno].p_varattnosyn = varattno + 1;
1325  }
1326 
1327  /* ... and build the nsitem */
1328  nsitem = (ParseNamespaceItem *) palloc(sizeof(ParseNamespaceItem));
1329  nsitem->p_names = rte->eref;
1330  nsitem->p_rte = rte;
1331  nsitem->p_rtindex = rtindex;
1332  nsitem->p_perminfo = perminfo;
1333  nsitem->p_nscolumns = nscolumns;
1334  /* set default visibility flags; might get changed later */
1335  nsitem->p_rel_visible = true;
1336  nsitem->p_cols_visible = true;
1337  nsitem->p_lateral_only = false;
1338  nsitem->p_lateral_ok = true;
1339 
1340  return nsitem;
1341 }

References Assert(), Alias::colnames, RangeTblEntry::eref, list_length(), TupleDescData::natts, ParseNamespaceItem::p_cols_visible, ParseNamespaceItem::p_lateral_ok, ParseNamespaceItem::p_lateral_only, ParseNamespaceItem::p_names, ParseNamespaceItem::p_nscolumns, ParseNamespaceItem::p_perminfo, ParseNamespaceItem::p_rel_visible, ParseNamespaceItem::p_rte, ParseNamespaceItem::p_rtindex, ParseNamespaceColumn::p_varattno, ParseNamespaceColumn::p_varattnosyn, ParseNamespaceColumn::p_varcollid, ParseNamespaceColumn::p_varno, ParseNamespaceColumn::p_varnosyn, ParseNamespaceColumn::p_vartype, ParseNamespaceColumn::p_vartypmod, palloc(), palloc0(), and TupleDescAttr.

Referenced by addRangeTableEntry(), addRangeTableEntryForENR(), addRangeTableEntryForFunction(), and addRangeTableEntryForRelation().

◆ buildRelationAliases()

static void buildRelationAliases ( TupleDesc  tupdesc,
Alias alias,
Alias eref 
)
static

Definition at line 1177 of file parse_relation.c.

1178 {
1179  int maxattrs = tupdesc->natts;
1180  List *aliaslist;
1181  ListCell *aliaslc;
1182  int numaliases;
1183  int varattno;
1184  int numdropped = 0;
1185 
1186  Assert(eref->colnames == NIL);
1187 
1188  if (alias)
1189  {
1190  aliaslist = alias->colnames;
1191  aliaslc = list_head(aliaslist);
1192  numaliases = list_length(aliaslist);
1193  /* We'll rebuild the alias colname list */
1194  alias->colnames = NIL;
1195  }
1196  else
1197  {
1198  aliaslist = NIL;
1199  aliaslc = NULL;
1200  numaliases = 0;
1201  }
1202 
1203  for (varattno = 0; varattno < maxattrs; varattno++)
1204  {
1205  Form_pg_attribute attr = TupleDescAttr(tupdesc, varattno);
1206  String *attrname;
1207 
1208  if (attr->attisdropped)
1209  {
1210  /* Always insert an empty string for a dropped column */
1211  attrname = makeString(pstrdup(""));
1212  if (aliaslc)
1213  alias->colnames = lappend(alias->colnames, attrname);
1214  numdropped++;
1215  }
1216  else if (aliaslc)
1217  {
1218  /* Use the next user-supplied alias */
1219  attrname = lfirst_node(String, aliaslc);
1220  aliaslc = lnext(aliaslist, aliaslc);
1221  alias->colnames = lappend(alias->colnames, attrname);
1222  }
1223  else
1224  {
1225  attrname = makeString(pstrdup(NameStr(attr->attname)));
1226  /* we're done with the alias if any */
1227  }
1228 
1229  eref->colnames = lappend(eref->colnames, attrname);
1230  }
1231 
1232  /* Too many user-supplied aliases? */
1233  if (aliaslc)
1234  ereport(ERROR,
1235  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
1236  errmsg("table \"%s\" has %d columns available but %d columns specified",
1237  eref->aliasname, maxattrs - numdropped, numaliases)));
1238 }
#define NameStr(name)
Definition: c.h:730
#define lfirst_node(type, lc)
Definition: pg_list.h:176
static ListCell * list_head(const List *l)
Definition: pg_list.h:128
static ListCell * lnext(const List *l, const ListCell *c)
Definition: pg_list.h:343
Definition: value.h:64

References Alias::aliasname, Assert(), Alias::colnames, ereport, errcode(), errmsg(), ERROR, lappend(), lfirst_node, list_head(), list_length(), lnext(), makeString(), NameStr, TupleDescData::natts, NIL, pstrdup(), and TupleDescAttr.

Referenced by addRangeTableEntry(), addRangeTableEntryForENR(), addRangeTableEntryForFunction(), and addRangeTableEntryForRelation().

◆ check_lateral_ref_ok()

static void check_lateral_ref_ok ( ParseState pstate,
ParseNamespaceItem nsitem,
int  location 
)
static

Definition at line 483 of file parse_relation.c.

485 {
486  if (nsitem->p_lateral_only && !nsitem->p_lateral_ok)
487  {
488  /* SQL:2008 demands this be an error, not an invisible item */
489  RangeTblEntry *rte = nsitem->p_rte;
490  char *refname = nsitem->p_names->aliasname;
491 
492  ereport(ERROR,
493  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
494  errmsg("invalid reference to FROM-clause entry for table \"%s\"",
495  refname),
496  (pstate->p_target_nsitem != NULL &&
497  rte == pstate->p_target_nsitem->p_rte) ?
498  errhint("There is an entry for table \"%s\", but it cannot be referenced from this part of the query.",
499  refname) :
500  errdetail("The combining JOIN type must be INNER or LEFT for a LATERAL reference."),
501  parser_errposition(pstate, location)));
502  }
503 }
int errdetail(const char *fmt,...)
Definition: elog.c:1202
int errhint(const char *fmt,...)
Definition: elog.c:1316
ParseNamespaceItem * p_target_nsitem
Definition: parse_node.h:207

References Alias::aliasname, ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, ParseNamespaceItem::p_lateral_ok, ParseNamespaceItem::p_lateral_only, ParseNamespaceItem::p_names, ParseNamespaceItem::p_rte, ParseState::p_target_nsitem, and parser_errposition().

Referenced by colNameToVar(), scanNameSpaceForRefname(), and scanNameSpaceForRelid().

◆ checkNameSpaceConflicts()

void checkNameSpaceConflicts ( ParseState pstate,
List namespace1,
List namespace2 
)

Definition at line 434 of file parse_relation.c.

436 {
437  ListCell *l1;
438 
439  foreach(l1, namespace1)
440  {
441  ParseNamespaceItem *nsitem1 = (ParseNamespaceItem *) lfirst(l1);
442  RangeTblEntry *rte1 = nsitem1->p_rte;
443  const char *aliasname1 = nsitem1->p_names->aliasname;
444  ListCell *l2;
445 
446  if (!nsitem1->p_rel_visible)
447  continue;
448 
449  foreach(l2, namespace2)
450  {
451  ParseNamespaceItem *nsitem2 = (ParseNamespaceItem *) lfirst(l2);
452  RangeTblEntry *rte2 = nsitem2->p_rte;
453  const char *aliasname2 = nsitem2->p_names->aliasname;
454 
455  if (!nsitem2->p_rel_visible)
456  continue;
457  if (strcmp(aliasname2, aliasname1) != 0)
458  continue; /* definitely no conflict */
459  if (rte1->rtekind == RTE_RELATION && rte1->alias == NULL &&
460  rte2->rtekind == RTE_RELATION && rte2->alias == NULL &&
461  rte1->relid != rte2->relid)
462  continue; /* no conflict per SQL rule */
463  ereport(ERROR,
464  (errcode(ERRCODE_DUPLICATE_ALIAS),
465  errmsg("table name \"%s\" specified more than once",
466  aliasname1)));
467  }
468  }
469 }

References RangeTblEntry::alias, Alias::aliasname, ereport, errcode(), errmsg(), ERROR, lfirst, ParseNamespaceItem::p_names, ParseNamespaceItem::p_rel_visible, ParseNamespaceItem::p_rte, RangeTblEntry::relid, RTE_RELATION, and RangeTblEntry::rtekind.

Referenced by transformFromClause(), and transformFromClauseItem().

◆ chooseScalarFunctionAlias()

static char* chooseScalarFunctionAlias ( Node funcexpr,
char *  funcname,
Alias alias,
int  nfuncs 
)
static

Definition at line 1254 of file parse_relation.c.

1256 {
1257  char *pname;
1258 
1259  /*
1260  * If the expression is a simple function call, and the function has a
1261  * single OUT parameter that is named, use the parameter's name.
1262  */
1263  if (funcexpr && IsA(funcexpr, FuncExpr))
1264  {
1265  pname = get_func_result_name(((FuncExpr *) funcexpr)->funcid);
1266  if (pname)
1267  return pname;
1268  }
1269 
1270  /*
1271  * If there's just one function in the RTE, and the user gave an RTE alias
1272  * name, use that name. (This makes FROM func() AS foo use "foo" as the
1273  * column name as well as the table alias.)
1274  */
1275  if (nfuncs == 1 && alias)
1276  return alias->aliasname;
1277 
1278  /*
1279  * Otherwise use the function name.
1280  */
1281  return funcname;
1282 }
char * get_func_result_name(Oid functionId)
Definition: funcapi.c:1599

References Alias::aliasname, funcname, get_func_result_name(), and IsA.

Referenced by addRangeTableEntryForFunction().

◆ colNameToVar()

Node* colNameToVar ( ParseState pstate,
const char *  colname,
bool  localonly,
int  location 
)

Definition at line 883 of file parse_relation.c.

885 {
886  Node *result = NULL;
887  int sublevels_up = 0;
888  ParseState *orig_pstate = pstate;
889 
890  while (pstate != NULL)
891  {
892  ListCell *l;
893 
894  foreach(l, pstate->p_namespace)
895  {
897  Node *newresult;
898 
899  /* Ignore table-only items */
900  if (!nsitem->p_cols_visible)
901  continue;
902  /* If not inside LATERAL, ignore lateral-only items */
903  if (nsitem->p_lateral_only && !pstate->p_lateral_active)
904  continue;
905 
906  /* use orig_pstate here for consistency with other callers */
907  newresult = scanNSItemForColumn(orig_pstate, nsitem, sublevels_up,
908  colname, location);
909 
910  if (newresult)
911  {
912  if (result)
913  ereport(ERROR,
914  (errcode(ERRCODE_AMBIGUOUS_COLUMN),
915  errmsg("column reference \"%s\" is ambiguous",
916  colname),
917  parser_errposition(pstate, location)));
918  check_lateral_ref_ok(pstate, nsitem, location);
919  result = newresult;
920  }
921  }
922 
923  if (result != NULL || localonly)
924  break; /* found, or don't want to look at parent */
925 
926  pstate = pstate->parentParseState;
927  sublevels_up++;
928  }
929 
930  return result;
931 }
Node * scanNSItemForColumn(ParseState *pstate, ParseNamespaceItem *nsitem, int sublevels_up, const char *colname, int location)
static void check_lateral_ref_ok(ParseState *pstate, ParseNamespaceItem *nsitem, int location)
ParseState * parentParseState
Definition: parse_node.h:191
bool p_lateral_active
Definition: parse_node.h:202

References check_lateral_ref_ok(), ereport, errcode(), errmsg(), ERROR, lfirst, ParseNamespaceItem::p_cols_visible, ParseState::p_lateral_active, ParseNamespaceItem::p_lateral_only, ParseState::p_namespace, ParseState::parentParseState, parser_errposition(), and scanNSItemForColumn().

Referenced by findTargetlistEntrySQL92(), and transformColumnRef().

◆ errorMissingColumn()

void errorMissingColumn ( ParseState pstate,
const char *  relname,
const char *  colname,
int  location 
)

Definition at line 3661 of file parse_relation.c.

3663 {
3665 
3666  /*
3667  * Search the entire rtable looking for possible matches. If we find one,
3668  * emit a hint about it.
3669  */
3670  state = searchRangeTableForCol(pstate, relname, colname, location);
3671 
3672  /*
3673  * If there are exact match(es), they must be inaccessible for some
3674  * reason.
3675  */
3676  if (state->rexact1)
3677  {
3678  /*
3679  * We don't try too hard when there's multiple inaccessible exact
3680  * matches, but at least be sure that we don't misleadingly suggest
3681  * that there's only one.
3682  */
3683  if (state->rexact2)
3684  ereport(ERROR,
3685  (errcode(ERRCODE_UNDEFINED_COLUMN),
3686  relname ?
3687  errmsg("column %s.%s does not exist", relname, colname) :
3688  errmsg("column \"%s\" does not exist", colname),
3689  errdetail("There are columns named \"%s\", but they are in tables that cannot be referenced from this part of the query.",
3690  colname),
3691  !relname ? errhint("Try using a table-qualified name.") : 0,
3692  parser_errposition(pstate, location)));
3693  /* Single exact match, so try to determine why it's inaccessible. */
3694  ereport(ERROR,
3695  (errcode(ERRCODE_UNDEFINED_COLUMN),
3696  relname ?
3697  errmsg("column %s.%s does not exist", relname, colname) :
3698  errmsg("column \"%s\" does not exist", colname),
3699  errdetail("There is a column named \"%s\" in table \"%s\", but it cannot be referenced from this part of the query.",
3700  colname, state->rexact1->eref->aliasname),
3701  rte_visible_if_lateral(pstate, state->rexact1) ?
3702  errhint("To reference that column, you must mark this subquery with LATERAL.") :
3703  (!relname && rte_visible_if_qualified(pstate, state->rexact1)) ?
3704  errhint("To reference that column, you must use a table-qualified name.") : 0,
3705  parser_errposition(pstate, location)));
3706  }
3707 
3708  if (!state->rsecond)
3709  {
3710  /* If we found no match at all, we have little to report */
3711  if (!state->rfirst)
3712  ereport(ERROR,
3713  (errcode(ERRCODE_UNDEFINED_COLUMN),
3714  relname ?
3715  errmsg("column %s.%s does not exist", relname, colname) :
3716  errmsg("column \"%s\" does not exist", colname),
3717  parser_errposition(pstate, location)));
3718  /* Handle case where we have a single alternative spelling to offer */
3719  ereport(ERROR,
3720  (errcode(ERRCODE_UNDEFINED_COLUMN),
3721  relname ?
3722  errmsg("column %s.%s does not exist", relname, colname) :
3723  errmsg("column \"%s\" does not exist", colname),
3724  errhint("Perhaps you meant to reference the column \"%s.%s\".",
3725  state->rfirst->eref->aliasname,
3726  strVal(list_nth(state->rfirst->eref->colnames,
3727  state->first - 1))),
3728  parser_errposition(pstate, location)));
3729  }
3730  else
3731  {
3732  /* Handle case where there are two equally useful column hints */
3733  ereport(ERROR,
3734  (errcode(ERRCODE_UNDEFINED_COLUMN),
3735  relname ?
3736  errmsg("column %s.%s does not exist", relname, colname) :
3737  errmsg("column \"%s\" does not exist", colname),
3738  errhint("Perhaps you meant to reference the column \"%s.%s\" or the column \"%s.%s\".",
3739  state->rfirst->eref->aliasname,
3740  strVal(list_nth(state->rfirst->eref->colnames,
3741  state->first - 1)),
3742  state->rsecond->eref->aliasname,
3743  strVal(list_nth(state->rsecond->eref->colnames,
3744  state->second - 1))),
3745  parser_errposition(pstate, location)));
3746  }
3747 }
static bool rte_visible_if_lateral(ParseState *pstate, RangeTblEntry *rte)
static FuzzyAttrMatchState * searchRangeTableForCol(ParseState *pstate, const char *alias, const char *colname, int location)
static bool rte_visible_if_qualified(ParseState *pstate, RangeTblEntry *rte)
NameData relname
Definition: pg_class.h:38
static void * list_nth(const List *list, int n)
Definition: pg_list.h:299
Definition: regguts.h:323
#define strVal(v)
Definition: value.h:82

References ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, list_nth(), parser_errposition(), relname, rte_visible_if_lateral(), rte_visible_if_qualified(), searchRangeTableForCol(), and strVal.

Referenced by transformColumnRef().

◆ errorMissingRTE()

void errorMissingRTE ( ParseState pstate,
RangeVar relation 
)

Definition at line 3590 of file parse_relation.c.

3591 {
3592  RangeTblEntry *rte;
3593  const char *badAlias = NULL;
3594 
3595  /*
3596  * Check to see if there are any potential matches in the query's
3597  * rangetable. (Note: cases involving a bad schema name in the RangeVar
3598  * will throw error immediately here. That seems OK.)
3599  */
3600  rte = searchRangeTableForRel(pstate, relation);
3601 
3602  /*
3603  * If we found a match that has an alias and the alias is visible in the
3604  * namespace, then the problem is probably use of the relation's real name
3605  * instead of its alias, ie "SELECT foo.* FROM foo f". This mistake is
3606  * common enough to justify a specific hint.
3607  *
3608  * If we found a match that doesn't meet those criteria, assume the
3609  * problem is illegal use of a relation outside its scope, as in the
3610  * MySQL-ism "SELECT ... FROM a, b LEFT JOIN c ON (a.x = c.y)".
3611  */
3612  if (rte && rte->alias &&
3613  strcmp(rte->eref->aliasname, relation->relname) != 0)
3614  {
3615  ParseNamespaceItem *nsitem;
3616  int sublevels_up;
3617 
3618  nsitem = refnameNamespaceItem(pstate, NULL, rte->eref->aliasname,
3619  relation->location,
3620  &sublevels_up);
3621  if (nsitem && nsitem->p_rte == rte)
3622  badAlias = rte->eref->aliasname;
3623  }
3624 
3625  /* If it looks like the user forgot to use an alias, hint about that */
3626  if (badAlias)
3627  ereport(ERROR,
3629  errmsg("invalid reference to FROM-clause entry for table \"%s\"",
3630  relation->relname),
3631  errhint("Perhaps you meant to reference the table alias \"%s\".",
3632  badAlias),
3633  parser_errposition(pstate, relation->location)));
3634  /* Hint about case where we found an (inaccessible) exact match */
3635  else if (rte)
3636  ereport(ERROR,
3638  errmsg("invalid reference to FROM-clause entry for table \"%s\"",
3639  relation->relname),
3640  errdetail("There is an entry for table \"%s\", but it cannot be referenced from this part of the query.",
3641  rte->eref->aliasname),
3642  rte_visible_if_lateral(pstate, rte) ?
3643  errhint("To reference that table, you must mark this subquery with LATERAL.") : 0,
3644  parser_errposition(pstate, relation->location)));
3645  /* Else, we have nothing to offer but the bald statement of error */
3646  else
3647  ereport(ERROR,
3649  errmsg("missing FROM-clause entry for table \"%s\"",
3650  relation->relname),
3651  parser_errposition(pstate, relation->location)));
3652 }
static RangeTblEntry * searchRangeTableForRel(ParseState *pstate, RangeVar *relation)
ParseNamespaceItem * refnameNamespaceItem(ParseState *pstate, const char *schemaname, const char *refname, int location, int *sublevels_up)
#define ERRCODE_UNDEFINED_TABLE
Definition: pgbench.c:78

References RangeTblEntry::alias, Alias::aliasname, RangeTblEntry::eref, ereport, errcode(), ERRCODE_UNDEFINED_TABLE, errdetail(), errhint(), errmsg(), ERROR, RangeVar::location, ParseNamespaceItem::p_rte, parser_errposition(), refnameNamespaceItem(), RangeVar::relname, rte_visible_if_lateral(), and searchRangeTableForRel().

Referenced by ExpandColumnRefStar(), and transformColumnRef().

◆ expandNSItemAttrs()

List* expandNSItemAttrs ( ParseState pstate,
ParseNamespaceItem nsitem,
int  sublevels_up,
bool  require_col_privs,
int  location 
)

Definition at line 3187 of file parse_relation.c.

3189 {
3190  RangeTblEntry *rte = nsitem->p_rte;
3191  RTEPermissionInfo *perminfo = nsitem->p_perminfo;
3192  List *names,
3193  *vars;
3194  ListCell *name,
3195  *var;
3196  List *te_list = NIL;
3197 
3198  vars = expandNSItemVars(pstate, nsitem, sublevels_up, location, &names);
3199 
3200  /*
3201  * Require read access to the table. This is normally redundant with the
3202  * markVarForSelectPriv calls below, but not if the table has zero
3203  * columns. We need not do anything if the nsitem is for a join: its
3204  * component tables will have been marked ACL_SELECT when they were added
3205  * to the rangetable. (This step changes things only for the target
3206  * relation of UPDATE/DELETE, which cannot be under a join.)
3207  */
3208  if (rte->rtekind == RTE_RELATION)
3209  {
3210  Assert(perminfo != NULL);
3211  perminfo->requiredPerms |= ACL_SELECT;
3212  }
3213 
3214  forboth(name, names, var, vars)
3215  {
3216  char *label = strVal(lfirst(name));
3217  Var *varnode = (Var *) lfirst(var);
3218  TargetEntry *te;
3219 
3220  te = makeTargetEntry((Expr *) varnode,
3221  (AttrNumber) pstate->p_next_resno++,
3222  label,
3223  false);
3224  te_list = lappend(te_list, te);
3225 
3226  if (require_col_privs)
3227  {
3228  /* Require read access to each column */
3229  markVarForSelectPriv(pstate, varnode);
3230  }
3231  }
3232 
3233  Assert(name == NULL && var == NULL); /* lists not the same length? */
3234 
3235  return te_list;
3236 }
const char * name
Definition: encode.c:571
TargetEntry * makeTargetEntry(Expr *expr, AttrNumber resno, char *resname, bool resjunk)
Definition: makefuncs.c:241
void markVarForSelectPriv(ParseState *pstate, Var *var)
List * expandNSItemVars(ParseState *pstate, ParseNamespaceItem *nsitem, int sublevels_up, int location, List **colnames)
static char * label
#define forboth(cell1, list1, cell2, list2)
Definition: pg_list.h:467
int p_next_resno
Definition: parse_node.h:211
Definition: primnodes.h:226
Definition: regcomp.c:281

References ACL_SELECT, Assert(), expandNSItemVars(), forboth, label, lappend(), lfirst, makeTargetEntry(), markVarForSelectPriv(), name, NIL, ParseState::p_next_resno, ParseNamespaceItem::p_perminfo, ParseNamespaceItem::p_rte, RTEPermissionInfo::requiredPerms, RTE_RELATION, RangeTblEntry::rtekind, and strVal.

Referenced by ExpandAllTables(), ExpandSingleTable(), and transformValuesClause().

◆ expandNSItemVars()

List* expandNSItemVars ( ParseState pstate,
ParseNamespaceItem nsitem,
int  sublevels_up,
int  location,
List **  colnames 
)

Definition at line 3123 of file parse_relation.c.

3126 {
3127  List *result = NIL;
3128  int colindex;
3129  ListCell *lc;
3130 
3131  if (colnames)
3132  *colnames = NIL;
3133  colindex = 0;
3134  foreach(lc, nsitem->p_names->colnames)
3135  {
3136  String *colnameval = lfirst(lc);
3137  const char *colname = strVal(colnameval);
3138  ParseNamespaceColumn *nscol = nsitem->p_nscolumns + colindex;
3139 
3140  if (nscol->p_dontexpand)
3141  {
3142  /* skip */
3143  }
3144  else if (colname[0])
3145  {
3146  Var *var;
3147 
3148  Assert(nscol->p_varno > 0);
3149  var = makeVar(nscol->p_varno,
3150  nscol->p_varattno,
3151  nscol->p_vartype,
3152  nscol->p_vartypmod,
3153  nscol->p_varcollid,
3154  sublevels_up);
3155  /* makeVar doesn't offer parameters for these, so set by hand: */
3156  var->varnosyn = nscol->p_varnosyn;
3157  var->varattnosyn = nscol->p_varattnosyn;
3158  var->location = location;
3159 
3160  /* ... and update varnullingrels */
3161  markNullableIfNeeded(pstate, var);
3162 
3163  result = lappend(result, var);
3164  if (colnames)
3165  *colnames = lappend(*colnames, colnameval);
3166  }
3167  else
3168  {
3169  /* dropped column, ignore */
3170  Assert(nscol->p_varno == 0);
3171  }
3172  colindex++;
3173  }
3174  return result;
3175 }
Var * makeVar(int varno, AttrNumber varattno, Oid vartype, int32 vartypmod, Oid varcollid, Index varlevelsup)
Definition: makefuncs.c:67
void markNullableIfNeeded(ParseState *pstate, Var *var)
int location
Definition: primnodes.h:271

References Assert(), Alias::colnames, lappend(), lfirst, Var::location, makeVar(), markNullableIfNeeded(), NIL, ParseNamespaceColumn::p_dontexpand, ParseNamespaceItem::p_names, ParseNamespaceItem::p_nscolumns, ParseNamespaceColumn::p_varattno, ParseNamespaceColumn::p_varattnosyn, ParseNamespaceColumn::p_varcollid, ParseNamespaceColumn::p_varno, ParseNamespaceColumn::p_varnosyn, ParseNamespaceColumn::p_vartype, ParseNamespaceColumn::p_vartypmod, and strVal.

Referenced by coerce_record_to_complex(), expandNSItemAttrs(), and ExpandSingleTable().

◆ expandRelation()

static void expandRelation ( Oid  relid,
Alias eref,
int  rtindex,
int  sublevels_up,
int  location,
bool  include_dropped,
List **  colnames,
List **  colvars 
)
static

Definition at line 3017 of file parse_relation.c.

3020 {
3021  Relation rel;
3022 
3023  /* Get the tupledesc and turn it over to expandTupleDesc */
3024  rel = relation_open(relid, AccessShareLock);
3025  expandTupleDesc(rel->rd_att, eref, rel->rd_att->natts, 0,
3026  rtindex, sublevels_up,
3027  location, include_dropped,
3028  colnames, colvars);
3030 }
static void expandTupleDesc(TupleDesc tupdesc, Alias *eref, int count, int offset, int rtindex, int sublevels_up, int location, bool include_dropped, List **colnames, List **colvars)
void relation_close(Relation relation, LOCKMODE lockmode)
Definition: relation.c:206
Relation relation_open(Oid relationId, LOCKMODE lockmode)
Definition: relation.c:48

References AccessShareLock, expandTupleDesc(), TupleDescData::natts, RelationData::rd_att, relation_close(), and relation_open().

Referenced by expandRTE().

◆ expandRTE()

void expandRTE ( RangeTblEntry rte,
int  rtindex,
int  sublevels_up,
int  location,
bool  include_dropped,
List **  colnames,
List **  colvars 
)

Definition at line 2664 of file parse_relation.c.

2667 {
2668  int varattno;
2669 
2670  if (colnames)
2671  *colnames = NIL;
2672  if (colvars)
2673  *colvars = NIL;
2674 
2675  switch (rte->rtekind)
2676  {
2677  case RTE_RELATION:
2678  /* Ordinary relation RTE */
2679  expandRelation(rte->relid, rte->eref,
2680  rtindex, sublevels_up, location,
2681  include_dropped, colnames, colvars);
2682  break;
2683  case RTE_SUBQUERY:
2684  {
2685  /* Subquery RTE */
2686  ListCell *aliasp_item = list_head(rte->eref->colnames);
2687  ListCell *tlistitem;
2688 
2689  varattno = 0;
2690  foreach(tlistitem, rte->subquery->targetList)
2691  {
2692  TargetEntry *te = (TargetEntry *) lfirst(tlistitem);
2693 
2694  if (te->resjunk)
2695  continue;
2696  varattno++;
2697  Assert(varattno == te->resno);
2698 
2699  /*
2700  * Formerly it was possible for the subquery tlist to have
2701  * more non-junk entries than the colnames list does (if
2702  * this RTE has been expanded from a view that has more
2703  * columns than it did when the current query was parsed).
2704  * Now that ApplyRetrieveRule cleans up such cases, we
2705  * shouldn't see that anymore, but let's just check.
2706  */
2707  if (!aliasp_item)
2708  elog(ERROR, "too few column names for subquery %s",
2709  rte->eref->aliasname);
2710 
2711  if (colnames)
2712  {
2713  char *label = strVal(lfirst(aliasp_item));
2714 
2715  *colnames = lappend(*colnames, makeString(pstrdup(label)));
2716  }
2717 
2718  if (colvars)
2719  {
2720  Var *varnode;
2721 
2722  varnode = makeVar(rtindex, varattno,
2723  exprType((Node *) te->expr),
2724  exprTypmod((Node *) te->expr),
2725  exprCollation((Node *) te->expr),
2726  sublevels_up);
2727  varnode->location = location;
2728 
2729  *colvars = lappend(*colvars, varnode);
2730  }
2731 
2732  aliasp_item = lnext(rte->eref->colnames, aliasp_item);
2733  }
2734  }
2735  break;
2736  case RTE_FUNCTION:
2737  {
2738  /* Function RTE */
2739  int atts_done = 0;
2740  ListCell *lc;
2741 
2742  foreach(lc, rte->functions)
2743  {
2744  RangeTblFunction *rtfunc = (RangeTblFunction *) lfirst(lc);
2745  TypeFuncClass functypclass;
2746  Oid funcrettype;
2747  TupleDesc tupdesc;
2748 
2749  functypclass = get_expr_result_type(rtfunc->funcexpr,
2750  &funcrettype,
2751  &tupdesc);
2752  if (functypclass == TYPEFUNC_COMPOSITE ||
2753  functypclass == TYPEFUNC_COMPOSITE_DOMAIN)
2754  {
2755  /* Composite data type, e.g. a table's row type */
2756  Assert(tupdesc);
2757  expandTupleDesc(tupdesc, rte->eref,
2758  rtfunc->funccolcount, atts_done,
2759  rtindex, sublevels_up, location,
2760  include_dropped, colnames, colvars);
2761  }
2762  else if (functypclass == TYPEFUNC_SCALAR)
2763  {
2764  /* Base data type, i.e. scalar */
2765  if (colnames)
2766  *colnames = lappend(*colnames,
2767  list_nth(rte->eref->colnames,
2768  atts_done));
2769 
2770  if (colvars)
2771  {
2772  Var *varnode;
2773 
2774  varnode = makeVar(rtindex, atts_done + 1,
2775  funcrettype,
2776  exprTypmod(rtfunc->funcexpr),
2777  exprCollation(rtfunc->funcexpr),
2778  sublevels_up);
2779  varnode->location = location;
2780 
2781  *colvars = lappend(*colvars, varnode);
2782  }
2783  }
2784  else if (functypclass == TYPEFUNC_RECORD)
2785  {
2786  if (colnames)
2787  {
2788  List *namelist;
2789 
2790  /* extract appropriate subset of column list */
2791  namelist = list_copy_tail(rte->eref->colnames,
2792  atts_done);
2793  namelist = list_truncate(namelist,
2794  rtfunc->funccolcount);
2795  *colnames = list_concat(*colnames, namelist);
2796  }
2797 
2798  if (colvars)
2799  {
2800  ListCell *l1;
2801  ListCell *l2;
2802  ListCell *l3;
2803  int attnum = atts_done;
2804 
2805  forthree(l1, rtfunc->funccoltypes,
2806  l2, rtfunc->funccoltypmods,
2807  l3, rtfunc->funccolcollations)
2808  {
2809  Oid attrtype = lfirst_oid(l1);
2810  int32 attrtypmod = lfirst_int(l2);
2811  Oid attrcollation = lfirst_oid(l3);
2812  Var *varnode;
2813 
2814  attnum++;
2815  varnode = makeVar(rtindex,
2816  attnum,
2817  attrtype,
2818  attrtypmod,
2819  attrcollation,
2820  sublevels_up);
2821  varnode->location = location;
2822  *colvars = lappend(*colvars, varnode);
2823  }
2824  }
2825  }
2826  else
2827  {
2828  /* addRangeTableEntryForFunction should've caught this */
2829  elog(ERROR, "function in FROM has unsupported return type");
2830  }
2831  atts_done += rtfunc->funccolcount;
2832  }
2833 
2834  /* Append the ordinality column if any */
2835  if (rte->funcordinality)
2836  {
2837  if (colnames)
2838  *colnames = lappend(*colnames,
2839  llast(rte->eref->colnames));
2840 
2841  if (colvars)
2842  {
2843  Var *varnode = makeVar(rtindex,
2844  atts_done + 1,
2845  INT8OID,
2846  -1,
2847  InvalidOid,
2848  sublevels_up);
2849 
2850  *colvars = lappend(*colvars, varnode);
2851  }
2852  }
2853  }
2854  break;
2855  case RTE_JOIN:
2856  {
2857  /* Join RTE */
2858  ListCell *colname;
2859  ListCell *aliasvar;
2860 
2862 
2863  varattno = 0;
2864  forboth(colname, rte->eref->colnames, aliasvar, rte->joinaliasvars)
2865  {
2866  Node *avar = (Node *) lfirst(aliasvar);
2867 
2868  varattno++;
2869 
2870  /*
2871  * During ordinary parsing, there will never be any
2872  * deleted columns in the join. While this function is
2873  * also used by the rewriter and planner, they do not
2874  * currently call it on any JOIN RTEs. Therefore, this
2875  * next bit is dead code, but it seems prudent to handle
2876  * the case correctly anyway.
2877  */
2878  if (avar == NULL)
2879  {
2880  if (include_dropped)
2881  {
2882  if (colnames)
2883  *colnames = lappend(*colnames,
2884  makeString(pstrdup("")));
2885  if (colvars)
2886  {
2887  /*
2888  * Can't use join's column type here (it might
2889  * be dropped!); but it doesn't really matter
2890  * what type the Const claims to be.
2891  */
2892  *colvars = lappend(*colvars,
2893  makeNullConst(INT4OID, -1,
2894  InvalidOid));
2895  }
2896  }
2897  continue;
2898  }
2899 
2900  if (colnames)
2901  {
2902  char *label = strVal(lfirst(colname));
2903 
2904  *colnames = lappend(*colnames,
2906  }
2907 
2908  if (colvars)
2909  {
2910  Var *varnode;
2911 
2912  /*
2913  * If the joinaliasvars entry is a simple Var, just
2914  * copy it (with adjustment of varlevelsup and
2915  * location); otherwise it is a JOIN USING column and
2916  * we must generate a join alias Var. This matches
2917  * the results that expansion of "join.*" by
2918  * expandNSItemVars would have produced, if we had
2919  * access to the ParseNamespaceItem for the join.
2920  */
2921  if (IsA(avar, Var))
2922  {
2923  varnode = copyObject((Var *) avar);
2924  varnode->varlevelsup = sublevels_up;
2925  }
2926  else
2927  varnode = makeVar(rtindex, varattno,
2928  exprType(avar),
2929  exprTypmod(avar),
2930  exprCollation(avar),
2931  sublevels_up);
2932  varnode->location = location;
2933 
2934  *colvars = lappend(*colvars, varnode);
2935  }
2936  }
2937  }
2938  break;
2939  case RTE_TABLEFUNC:
2940  case RTE_VALUES:
2941  case RTE_CTE:
2942  case RTE_NAMEDTUPLESTORE:
2943  {
2944  /* Tablefunc, Values, CTE, or ENR RTE */
2945  ListCell *aliasp_item = list_head(rte->eref->colnames);
2946  ListCell *lct;
2947  ListCell *lcm;
2948  ListCell *lcc;
2949 
2950  varattno = 0;
2951  forthree(lct, rte->coltypes,
2952  lcm, rte->coltypmods,
2953  lcc, rte->colcollations)
2954  {
2955  Oid coltype = lfirst_oid(lct);
2956  int32 coltypmod = lfirst_int(lcm);
2957  Oid colcoll = lfirst_oid(lcc);
2958 
2959  varattno++;
2960 
2961  if (colnames)
2962  {
2963  /* Assume there is one alias per output column */
2964  if (OidIsValid(coltype))
2965  {
2966  char *label = strVal(lfirst(aliasp_item));
2967 
2968  *colnames = lappend(*colnames,
2970  }
2971  else if (include_dropped)
2972  *colnames = lappend(*colnames,
2973  makeString(pstrdup("")));
2974 
2975  aliasp_item = lnext(rte->eref->colnames, aliasp_item);
2976  }
2977 
2978  if (colvars)
2979  {
2980  if (OidIsValid(coltype))
2981  {
2982  Var *varnode;
2983 
2984  varnode = makeVar(rtindex, varattno,
2985  coltype, coltypmod, colcoll,
2986  sublevels_up);
2987  varnode->location = location;
2988 
2989  *colvars = lappend(*colvars, varnode);
2990  }
2991  else if (include_dropped)
2992  {
2993  /*
2994  * It doesn't really matter what type the Const
2995  * claims to be.
2996  */
2997  *colvars = lappend(*colvars,
2998  makeNullConst(INT4OID, -1,
2999  InvalidOid));
3000  }
3001  }
3002  }
3003  }
3004  break;
3005  case RTE_RESULT:
3006  /* These expose no columns, so nothing to do */
3007  break;
3008  default:
3009  elog(ERROR, "unrecognized RTE kind: %d", (int) rte->rtekind);
3010  }
3011 }
List * list_truncate(List *list, int new_size)
Definition: list.c:630
Const * makeNullConst(Oid consttype, int32 consttypmod, Oid constcollid)
Definition: makefuncs.c:340
static void expandRelation(Oid relid, Alias *eref, int rtindex, int sublevels_up, int location, bool include_dropped, List **colnames, List **colvars)
@ RTE_RESULT
Definition: parsenodes.h:1022
int16 attnum
Definition: pg_attribute.h:74
#define llast(l)
Definition: pg_list.h:198
Index varlevelsup
Definition: primnodes.h:258

References Alias::aliasname, Assert(), attnum, RangeTblEntry::colcollations, Alias::colnames, RangeTblEntry::coltypes, RangeTblEntry::coltypmods, copyObject, elog(), RangeTblEntry::eref, ERROR, expandRelation(), expandTupleDesc(), TargetEntry::expr, exprCollation(), exprType(), exprTypmod(), forboth, forthree, RangeTblFunction::funcexpr, RangeTblEntry::funcordinality, RangeTblEntry::functions, get_expr_result_type(), InvalidOid, IsA, RangeTblEntry::joinaliasvars, label, lappend(), lfirst, lfirst_int, lfirst_oid, list_concat(), list_copy_tail(), list_head(), list_length(), list_nth(), list_truncate(), llast, lnext(), Var::location, makeNullConst(), makeString(), makeVar(), NIL, OidIsValid, pstrdup(), RangeTblEntry::relid, TargetEntry::resno, RTE_CTE, RTE_FUNCTION, RTE_JOIN, RTE_NAMEDTUPLESTORE, RTE_RELATION, RTE_RESULT, RTE_SUBQUERY, RTE_TABLEFUNC, RTE_VALUES, RangeTblEntry::rtekind, strVal, RangeTblEntry::subquery, Query::targetList, TYPEFUNC_COMPOSITE, TYPEFUNC_COMPOSITE_DOMAIN, TYPEFUNC_RECORD, TYPEFUNC_SCALAR, and Var::varlevelsup.

Referenced by build_physical_tlist(), expandRecordVariable(), pullup_replace_vars_callback(), ReplaceVarsFromTargetList_callback(), set_relation_column_names(), and transformWholeRowRef().

◆ expandTupleDesc()

static void expandTupleDesc ( TupleDesc  tupdesc,
Alias eref,
int  count,
int  offset,
int  rtindex,
int  sublevels_up,
int  location,
bool  include_dropped,
List **  colnames,
List **  colvars 
)
static

Definition at line 3042 of file parse_relation.c.

3046 {
3047  ListCell *aliascell;
3048  int varattno;
3049 
3050  aliascell = (offset < list_length(eref->colnames)) ?
3051  list_nth_cell(eref->colnames, offset) : NULL;
3052 
3053  Assert(count <= tupdesc->natts);
3054  for (varattno = 0; varattno < count; varattno++)
3055  {
3056  Form_pg_attribute attr = TupleDescAttr(tupdesc, varattno);
3057 
3058  if (attr->attisdropped)
3059  {
3060  if (include_dropped)
3061  {
3062  if (colnames)
3063  *colnames = lappend(*colnames, makeString(pstrdup("")));
3064  if (colvars)
3065  {
3066  /*
3067  * can't use atttypid here, but it doesn't really matter
3068  * what type the Const claims to be.
3069  */
3070  *colvars = lappend(*colvars,
3071  makeNullConst(INT4OID, -1, InvalidOid));
3072  }
3073  }
3074  if (aliascell)
3075  aliascell = lnext(eref->colnames, aliascell);
3076  continue;
3077  }
3078 
3079  if (colnames)
3080  {
3081  char *label;
3082 
3083  if (aliascell)
3084  {
3085  label = strVal(lfirst(aliascell));
3086  aliascell = lnext(eref->colnames, aliascell);
3087  }
3088  else
3089  {
3090  /* If we run out of aliases, use the underlying name */
3091  label = NameStr(attr->attname);
3092  }
3093  *colnames = lappend(*colnames, makeString(pstrdup(label)));
3094  }
3095 
3096  if (colvars)
3097  {
3098  Var *varnode;
3099 
3100  varnode = makeVar(rtindex, varattno + offset + 1,
3101  attr->atttypid, attr->atttypmod,
3102  attr->attcollation,
3103  sublevels_up);
3104  varnode->location = location;
3105 
3106  *colvars = lappend(*colvars, varnode);
3107  }
3108  }
3109 }
static ListCell * list_nth_cell(const List *list, int n)
Definition: pg_list.h:277

References Assert(), Alias::colnames, InvalidOid, label, lappend(), lfirst, list_length(), list_nth_cell(), lnext(), Var::location, makeNullConst(), makeString(), makeVar(), NameStr, pstrdup(), strVal, and TupleDescAttr.

Referenced by expandRelation(), and expandRTE().

◆ findNSItemForRTE()

static ParseNamespaceItem* findNSItemForRTE ( ParseState pstate,
RangeTblEntry rte 
)
static

Definition at line 3754 of file parse_relation.c.

3755 {
3756  while (pstate != NULL)
3757  {
3758  ListCell *l;
3759 
3760  foreach(l, pstate->p_namespace)
3761  {
3762  ParseNamespaceItem *nsitem = (ParseNamespaceItem *) lfirst(l);
3763 
3764  if (nsitem->p_rte == rte)
3765  return nsitem;
3766  }
3767  pstate = pstate->parentParseState;
3768  }
3769  return NULL;
3770 }

References lfirst, ParseState::p_namespace, ParseNamespaceItem::p_rte, and ParseState::parentParseState.

Referenced by rte_visible_if_lateral(), and rte_visible_if_qualified().

◆ get_parse_rowmark()

RowMarkClause* get_parse_rowmark ( Query qry,
Index  rtindex 
)

Definition at line 3455 of file parse_relation.c.

3456 {
3457  ListCell *l;
3458 
3459  foreach(l, qry->rowMarks)
3460  {
3461  RowMarkClause *rc = (RowMarkClause *) lfirst(l);
3462 
3463  if (rc->rti == rtindex)
3464  return rc;
3465  }
3466  return NULL;
3467 }
List * rowMarks
Definition: parsenodes.h:215

References lfirst, Query::rowMarks, and RowMarkClause::rti.

Referenced by AcquireRewriteLocks(), applyLockingClause(), and ApplyRetrieveRule().

◆ get_rte_attribute_is_dropped()

bool get_rte_attribute_is_dropped ( RangeTblEntry rte,
AttrNumber  attnum 
)

Definition at line 3291 of file parse_relation.c.

3292 {
3293  bool result;
3294 
3295  switch (rte->rtekind)
3296  {
3297  case RTE_RELATION:
3298  {
3299  /*
3300  * Plain relation RTE --- get the attribute's catalog entry
3301  */
3302  HeapTuple tp;
3303  Form_pg_attribute att_tup;
3304 
3305  tp = SearchSysCache2(ATTNUM,
3306  ObjectIdGetDatum(rte->relid),
3308  if (!HeapTupleIsValid(tp)) /* shouldn't happen */
3309  elog(ERROR, "cache lookup failed for attribute %d of relation %u",
3310  attnum, rte->relid);
3311  att_tup = (Form_pg_attribute) GETSTRUCT(tp);
3312  result = att_tup->attisdropped;
3313  ReleaseSysCache(tp);
3314  }
3315  break;
3316  case RTE_SUBQUERY:
3317  case RTE_TABLEFUNC:
3318  case RTE_VALUES:
3319  case RTE_CTE:
3320 
3321  /*
3322  * Subselect, Table Functions, Values, CTE RTEs never have dropped
3323  * columns
3324  */
3325  result = false;
3326  break;
3327  case RTE_NAMEDTUPLESTORE:
3328  {
3329  /* Check dropped-ness by testing for valid coltype */
3330  if (attnum <= 0 ||
3331  attnum > list_length(rte->coltypes))
3332  elog(ERROR, "invalid varattno %d", attnum);
3333  result = !OidIsValid((list_nth_oid(rte->coltypes, attnum - 1)));
3334  }
3335  break;
3336  case RTE_JOIN:
3337  {
3338  /*
3339  * A join RTE would not have dropped columns when constructed,
3340  * but one in a stored rule might contain columns that were
3341  * dropped from the underlying tables, if said columns are
3342  * nowhere explicitly referenced in the rule. This will be
3343  * signaled to us by a null pointer in the joinaliasvars list.
3344  */
3345  Var *aliasvar;
3346 
3347  if (attnum <= 0 ||
3349  elog(ERROR, "invalid varattno %d", attnum);
3350  aliasvar = (Var *) list_nth(rte->joinaliasvars, attnum - 1);
3351 
3352  result = (aliasvar == NULL);
3353  }
3354  break;
3355  case RTE_FUNCTION:
3356  {
3357  /* Function RTE */
3358  ListCell *lc;
3359  int atts_done = 0;
3360 
3361  /*
3362  * Dropped attributes are only possible with functions that
3363  * return named composite types. In such a case we have to
3364  * look up the result type to see if it currently has this
3365  * column dropped. So first, loop over the funcs until we
3366  * find the one that covers the requested column.
3367  */
3368  foreach(lc, rte->functions)
3369  {
3370  RangeTblFunction *rtfunc = (RangeTblFunction *) lfirst(lc);
3371 
3372  if (attnum > atts_done &&
3373  attnum <= atts_done + rtfunc->funccolcount)
3374  {
3375  TupleDesc tupdesc;
3376 
3377  tupdesc = get_expr_result_tupdesc(rtfunc->funcexpr,
3378  true);
3379  if (tupdesc)
3380  {
3381  /* Composite data type, e.g. a table's row type */
3382  Form_pg_attribute att_tup;
3383 
3384  Assert(tupdesc);
3385  Assert(attnum - atts_done <= tupdesc->natts);
3386  att_tup = TupleDescAttr(tupdesc,
3387  attnum - atts_done - 1);
3388  return att_tup->attisdropped;
3389  }
3390  /* Otherwise, it can't have any dropped columns */
3391  return false;
3392  }
3393  atts_done += rtfunc->funccolcount;
3394  }
3395 
3396  /* If we get here, must be looking for the ordinality column */
3397  if (rte->funcordinality && attnum == atts_done + 1)
3398  return false;
3399 
3400  /* this probably can't happen ... */
3401  ereport(ERROR,
3402  (errcode(ERRCODE_UNDEFINED_COLUMN),
3403  errmsg("column %d of relation \"%s\" does not exist",
3404  attnum,
3405  rte->eref->aliasname)));
3406  result = false; /* keep compiler quiet */
3407  }
3408  break;
3409  case RTE_RESULT:
3410  /* this probably can't happen ... */
3411  ereport(ERROR,
3412  (errcode(ERRCODE_UNDEFINED_COLUMN),
3413  errmsg("column %d of relation \"%s\" does not exist",
3414  attnum,
3415  rte->eref->aliasname)));
3416  result = false; /* keep compiler quiet */
3417  break;
3418  default:
3419  elog(ERROR, "unrecognized RTE kind: %d", (int) rte->rtekind);
3420  result = false; /* keep compiler quiet */
3421  }
3422 
3423  return result;
3424 }
TupleDesc get_expr_result_tupdesc(Node *expr, bool noError)
Definition: funcapi.c:543
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define GETSTRUCT(TUP)
Definition: htup_details.h:653
static Oid list_nth_oid(const List *list, int n)
Definition: pg_list.h:321
static Datum Int16GetDatum(int16 X)
Definition: postgres.h:172
static Datum ObjectIdGetDatum(Oid X)
Definition: postgres.h:252
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:866
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:829
@ ATTNUM
Definition: syscache.h:41

References Alias::aliasname, Assert(), attnum, ATTNUM, RangeTblEntry::coltypes, elog(), RangeTblEntry::eref, ereport, errcode(), errmsg(), ERROR, RangeTblFunction::funcexpr, RangeTblEntry::funcordinality, RangeTblEntry::functions, get_expr_result_tupdesc(), GETSTRUCT, HeapTupleIsValid, Int16GetDatum(), RangeTblEntry::joinaliasvars, lfirst, list_length(), list_nth(), list_nth_oid(), ObjectIdGetDatum(), OidIsValid, ReleaseSysCache(), RangeTblEntry::relid, RTE_CTE, RTE_FUNCTION, RTE_JOIN, RTE_NAMEDTUPLESTORE, RTE_RELATION, RTE_RESULT, RTE_SUBQUERY, RTE_TABLEFUNC, RTE_VALUES, RangeTblEntry::rtekind, SearchSysCache2(), and TupleDescAttr.

Referenced by AcquireRewriteLocks().

◆ get_rte_attribute_name()

char* get_rte_attribute_name ( RangeTblEntry rte,
AttrNumber  attnum 
)

Definition at line 3253 of file parse_relation.c.

3254 {
3255  if (attnum == InvalidAttrNumber)
3256  return "*";
3257 
3258  /*
3259  * If there is a user-written column alias, use it.
3260  */
3261  if (rte->alias &&
3262  attnum > 0 && attnum <= list_length(rte->alias->colnames))
3263  return strVal(list_nth(rte->alias->colnames, attnum - 1));
3264 
3265  /*
3266  * If the RTE is a relation, go to the system catalogs not the
3267  * eref->colnames list. This is a little slower but it will give the
3268  * right answer if the column has been renamed since the eref list was
3269  * built (which can easily happen for rules).
3270  */
3271  if (rte->rtekind == RTE_RELATION)
3272  return get_attname(rte->relid, attnum, false);
3273 
3274  /*
3275  * Otherwise use the column name from eref. There should always be one.
3276  */
3277  if (attnum > 0 && attnum <= list_length(rte->eref->colnames))
3278  return strVal(list_nth(rte->eref->colnames, attnum - 1));
3279 
3280  /* else caller gave us a bogus attnum */
3281  elog(ERROR, "invalid attnum %d for rangetable entry %s",
3282  attnum, rte->eref->aliasname);
3283  return NULL; /* keep compiler quiet */
3284 }
char * get_attname(Oid relid, AttrNumber attnum, bool missing_ok)
Definition: lsyscache.c:826

References RangeTblEntry::alias, Alias::aliasname, attnum, Alias::colnames, elog(), RangeTblEntry::eref, ERROR, get_attname(), InvalidAttrNumber, list_length(), list_nth(), RangeTblEntry::relid, RTE_RELATION, RangeTblEntry::rtekind, and strVal.

Referenced by check_ungrouped_columns_walker(), get_name_for_var_field(), get_variable(), and print_expr().

◆ get_tle_by_resno()

◆ GetCTEForRTE()

CommonTableExpr* GetCTEForRTE ( ParseState pstate,
RangeTblEntry rte,
int  rtelevelsup 
)

Definition at line 557 of file parse_relation.c.

558 {
559  Index levelsup;
560  ListCell *lc;
561 
562  Assert(rte->rtekind == RTE_CTE);
563  levelsup = rte->ctelevelsup + rtelevelsup;
564  while (levelsup-- > 0)
565  {
566  pstate = pstate->parentParseState;
567  if (!pstate) /* shouldn't happen */
568  elog(ERROR, "bad levelsup for CTE \"%s\"", rte->ctename);
569  }
570  foreach(lc, pstate->p_ctenamespace)
571  {
572  CommonTableExpr *cte = (CommonTableExpr *) lfirst(lc);
573 
574  if (strcmp(cte->ctename, rte->ctename) == 0)
575  return cte;
576  }
577  /* shouldn't happen */
578  elog(ERROR, "could not find CTE \"%s\"", rte->ctename);
579  return NULL; /* keep compiler quiet */
580 }
unsigned int Index
Definition: c.h:598
List * p_ctenamespace
Definition: parse_node.h:203

References Assert(), RangeTblEntry::ctelevelsup, RangeTblEntry::ctename, CommonTableExpr::ctename, elog(), ERROR, lfirst, ParseState::p_ctenamespace, ParseState::parentParseState, RTE_CTE, and RangeTblEntry::rtekind.

Referenced by expandRecordVariable(), and markTargetListOrigin().

◆ GetNSItemByRangeTablePosn()

ParseNamespaceItem* GetNSItemByRangeTablePosn ( ParseState pstate,
int  varno,
int  sublevels_up 
)

Definition at line 510 of file parse_relation.c.

513 {
514  ListCell *lc;
515 
516  while (sublevels_up-- > 0)
517  {
518  pstate = pstate->parentParseState;
519  Assert(pstate != NULL);
520  }
521  foreach(lc, pstate->p_namespace)
522  {
523  ParseNamespaceItem *nsitem = (ParseNamespaceItem *) lfirst(lc);
524 
525  if (nsitem->p_rtindex == varno)
526  return nsitem;
527  }
528  elog(ERROR, "nsitem not found (internal error)");
529  return NULL; /* keep compiler quiet */
530 }

References Assert(), elog(), ERROR, lfirst, ParseState::p_namespace, ParseNamespaceItem::p_rtindex, and ParseState::parentParseState.

Referenced by coerce_record_to_complex(), ExpandRowReference(), ParseComplexProjection(), and transformMergeStmt().

◆ GetRTEByRangeTablePosn()

RangeTblEntry* GetRTEByRangeTablePosn ( ParseState pstate,
int  varno,
int  sublevels_up 
)

Definition at line 537 of file parse_relation.c.

540 {
541  while (sublevels_up-- > 0)
542  {
543  pstate = pstate->parentParseState;
544  Assert(pstate != NULL);
545  }
546  Assert(varno > 0 && varno <= list_length(pstate->p_rtable));
547  return rt_fetch(varno, pstate->p_rtable);
548 }
#define rt_fetch(rangetable_index, rangetable)
Definition: parsetree.h:31

References Assert(), list_length(), ParseState::p_rtable, ParseState::parentParseState, and rt_fetch.

Referenced by count_rowexpr_columns(), expandRecordVariable(), markTargetListOrigin(), and unknown_attribute().

◆ getRTEPermissionInfo()

RTEPermissionInfo* getRTEPermissionInfo ( List rteperminfos,
RangeTblEntry rte 
)

Definition at line 3899 of file parse_relation.c.

3900 {
3901  RTEPermissionInfo *perminfo;
3902 
3903  if (rte->perminfoindex == 0 ||
3904  rte->perminfoindex > list_length(rteperminfos))
3905  elog(ERROR, "invalid perminfoindex %u in RTE with relid %u",
3906  rte->perminfoindex, rte->relid);
3907  perminfo = list_nth_node(RTEPermissionInfo, rteperminfos,
3908  rte->perminfoindex - 1);
3909  if (perminfo->relid != rte->relid)
3910  elog(ERROR, "permission info at index %u (with relid=%u) does not match provided RTE (with relid=%u)",
3911  rte->perminfoindex, perminfo->relid, rte->relid);
3912 
3913  return perminfo;
3914 }
#define list_nth_node(type, list, n)
Definition: pg_list.h:327

References elog(), ERROR, list_length(), list_nth_node, RangeTblEntry::perminfoindex, RangeTblEntry::relid, and RTEPermissionInfo::relid.

Referenced by add_rte_to_flat_rtable(), build_simple_rel(), ExecCheckPermissions(), expand_inherited_rtentry(), get_rel_all_updated_cols(), get_row_security_policies(), GetResultRTEPermissionInfo(), markQueryForLocking(), markRTEForSelectPriv(), rewriteTargetView(), and transformLockingClause().

◆ isFutureCTE()

static bool isFutureCTE ( ParseState pstate,
const char *  refname 
)
static

Definition at line 313 of file parse_relation.c.

314 {
315  for (; pstate != NULL; pstate = pstate->parentParseState)
316  {
317  ListCell *lc;
318 
319  foreach(lc, pstate->p_future_ctes)
320  {
321  CommonTableExpr *cte = (CommonTableExpr *) lfirst(lc);
322 
323  if (strcmp(cte->ctename, refname) == 0)
324  return true;
325  }
326  }
327  return false;
328 }
List * p_future_ctes
Definition: parse_node.h:204

References CommonTableExpr::ctename, lfirst, ParseState::p_future_ctes, and ParseState::parentParseState.

Referenced by parserOpenTable().

◆ isLockedRefname()

bool isLockedRefname ( ParseState pstate,
const char *  refname 
)

Definition at line 2580 of file parse_relation.c.

2581 {
2582  ListCell *l;
2583 
2584  /*
2585  * If we are in a subquery specified as locked FOR UPDATE/SHARE from
2586  * parent level, then act as though there's a generic FOR UPDATE here.
2587  */
2588  if (pstate->p_locked_from_parent)
2589  return true;
2590 
2591  foreach(l, pstate->p_locking_clause)
2592  {
2593  LockingClause *lc = (LockingClause *) lfirst(l);
2594 
2595  if (lc->lockedRels == NIL)
2596  {
2597  /* all tables used in query */
2598  return true;
2599  }
2600  else if (refname != NULL)
2601  {
2602  /* just the named tables */
2603  ListCell *l2;
2604 
2605  foreach(l2, lc->lockedRels)
2606  {
2607  RangeVar *thisrel = (RangeVar *) lfirst(l2);
2608 
2609  if (strcmp(refname, thisrel->relname) == 0)
2610  return true;
2611  }
2612  }
2613  }
2614  return false;
2615 }
List * lockedRels
Definition: parsenodes.h:829
bool p_locked_from_parent
Definition: parse_node.h:214
List * p_locking_clause
Definition: parse_node.h:213

References lfirst, LockingClause::lockedRels, NIL, ParseState::p_locked_from_parent, ParseState::p_locking_clause, and RangeVar::relname.

Referenced by addRangeTableEntry(), and transformRangeSubselect().

◆ isQueryUsingTempRelation()

bool isQueryUsingTempRelation ( Query query)

Definition at line 3820 of file parse_relation.c.

3821 {
3822  return isQueryUsingTempRelation_walker((Node *) query, NULL);
3823 }
static bool isQueryUsingTempRelation_walker(Node *node, void *context)

References isQueryUsingTempRelation_walker().

Referenced by DefineView(), and transformCreateTableAsStmt().

◆ isQueryUsingTempRelation_walker()

static bool isQueryUsingTempRelation_walker ( Node node,
void *  context 
)
static

Definition at line 3826 of file parse_relation.c.

3827 {
3828  if (node == NULL)
3829  return false;
3830 
3831  if (IsA(node, Query))
3832  {
3833  Query *query = (Query *) node;
3834  ListCell *rtable;
3835 
3836  foreach(rtable, query->rtable)
3837  {
3838  RangeTblEntry *rte = lfirst(rtable);
3839 
3840  if (rte->rtekind == RTE_RELATION)
3841  {
3843  char relpersistence = rel->rd_rel->relpersistence;
3844 
3846  if (relpersistence == RELPERSISTENCE_TEMP)
3847  return true;
3848  }
3849  }
3850 
3851  return query_tree_walker(query,
3853  context,
3855  }
3856 
3857  return expression_tree_walker(node,
3859  context);
3860 }
#define query_tree_walker(q, w, c, f)
Definition: nodeFuncs.h:156
#define expression_tree_walker(n, w, c)
Definition: nodeFuncs.h:151
#define QTW_IGNORE_JOINALIASES
Definition: nodeFuncs.h:25
List * rtable
Definition: parsenodes.h:175
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:40

References AccessShareLock, expression_tree_walker, IsA, lfirst, QTW_IGNORE_JOINALIASES, query_tree_walker, RelationData::rd_rel, RangeTblEntry::relid, Query::rtable, RTE_RELATION, RangeTblEntry::rtekind, table_close(), and table_open().

Referenced by isQueryUsingTempRelation().

◆ markNullableIfNeeded()

void markNullableIfNeeded ( ParseState pstate,
Var var 
)

Definition at line 1035 of file parse_relation.c.

1036 {
1037  int rtindex = var->varno;
1038  Bitmapset *relids;
1039 
1040  /* Find the appropriate pstate */
1041  for (int lv = 0; lv < var->varlevelsup; lv++)
1042  pstate = pstate->parentParseState;
1043 
1044  /* Find currently-relevant join relids for the Var's rel */
1045  if (rtindex > 0 && rtindex <= list_length(pstate->p_nullingrels))
1046  relids = (Bitmapset *) list_nth(pstate->p_nullingrels, rtindex - 1);
1047  else
1048  relids = NULL;
1049 
1050  /*
1051  * Merge with any already-declared nulling rels. (Typically there won't
1052  * be any, but let's get it right if there are.)
1053  */
1054  if (relids != NULL)
1055  var->varnullingrels = bms_union(var->varnullingrels, relids);
1056 }
Bitmapset * bms_union(const Bitmapset *a, const Bitmapset *b)
Definition: bitmapset.c:226
List * p_nullingrels
Definition: parse_node.h:197
int varno
Definition: primnodes.h:233

References bms_union(), if(), list_length(), list_nth(), ParseState::p_nullingrels, ParseState::parentParseState, Var::varlevelsup, and Var::varno.

Referenced by buildVarFromNSColumn(), expandNSItemVars(), scanNSItemForColumn(), and transformWholeRowRef().

◆ markRTEForSelectPriv()

static void markRTEForSelectPriv ( ParseState pstate,
int  rtindex,
AttrNumber  col 
)
static

Definition at line 1066 of file parse_relation.c.

1067 {
1068  RangeTblEntry *rte = rt_fetch(rtindex, pstate->p_rtable);
1069 
1070  if (rte->rtekind == RTE_RELATION)
1071  {
1072  RTEPermissionInfo *perminfo;
1073 
1074  /* Make sure the rel as a whole is marked for SELECT access */
1075  perminfo = getRTEPermissionInfo(pstate->p_rteperminfos, rte);
1076  perminfo->requiredPerms |= ACL_SELECT;
1077  /* Must offset the attnum to fit in a bitmapset */
1078  perminfo->selectedCols =
1079  bms_add_member(perminfo->selectedCols,
1081  }
1082  else if (rte->rtekind == RTE_JOIN)
1083  {
1084  if (col == InvalidAttrNumber)
1085  {
1086  /*
1087  * A whole-row reference to a join has to be treated as whole-row
1088  * references to the two inputs.
1089  */
1090  JoinExpr *j;
1091 
1092  if (rtindex > 0 && rtindex <= list_length(pstate->p_joinexprs))
1093  j = list_nth_node(JoinExpr, pstate->p_joinexprs, rtindex - 1);
1094  else
1095  j = NULL;
1096  if (j == NULL)
1097  elog(ERROR, "could not find JoinExpr for whole-row reference");
1098 
1099  /* Note: we can't see FromExpr here */
1100  if (IsA(j->larg, RangeTblRef))
1101  {
1102  int varno = ((RangeTblRef *) j->larg)->rtindex;
1103 
1104  markRTEForSelectPriv(pstate, varno, InvalidAttrNumber);
1105  }
1106  else if (IsA(j->larg, JoinExpr))
1107  {
1108  int varno = ((JoinExpr *) j->larg)->rtindex;
1109 
1110  markRTEForSelectPriv(pstate, varno, InvalidAttrNumber);
1111  }
1112  else
1113  elog(ERROR, "unrecognized node type: %d",
1114  (int) nodeTag(j->larg));
1115  if (IsA(j->rarg, RangeTblRef))
1116  {
1117  int varno = ((RangeTblRef *) j->rarg)->rtindex;
1118 
1119  markRTEForSelectPriv(pstate, varno, InvalidAttrNumber);
1120  }
1121  else if (IsA(j->rarg, JoinExpr))
1122  {
1123  int varno = ((JoinExpr *) j->rarg)->rtindex;
1124 
1125  markRTEForSelectPriv(pstate, varno, InvalidAttrNumber);
1126  }
1127  else
1128  elog(ERROR, "unrecognized node type: %d",
1129  (int) nodeTag(j->rarg));
1130  }
1131  else
1132  {
1133  /*
1134  * Join alias Vars for ordinary columns must refer to merged JOIN
1135  * USING columns. We don't need to do anything here, because the
1136  * join input columns will also be referenced in the join's qual
1137  * clause, and will get marked for select privilege there.
1138  */
1139  }
1140  }
1141  /* other RTE types don't require privilege marking */
1142 }
Bitmapset * bms_add_member(Bitmapset *a, int x)
Definition: bitmapset.c:755
#define nodeTag(nodeptr)
Definition: nodes.h:133
RTEPermissionInfo * getRTEPermissionInfo(List *rteperminfos, RangeTblEntry *rte)
static void markRTEForSelectPriv(ParseState *pstate, int rtindex, AttrNumber col)
List * p_joinexprs
Definition: parse_node.h:196
Bitmapset * selectedCols
Definition: parsenodes.h:1248
#define FirstLowInvalidHeapAttributeNumber
Definition: sysattr.h:27

References ACL_SELECT, bms_add_member(), elog(), ERROR, FirstLowInvalidHeapAttributeNumber, getRTEPermissionInfo(), InvalidAttrNumber, IsA, j, list_length(), list_nth_node, nodeTag, ParseState::p_joinexprs, ParseState::p_rtable, ParseState::p_rteperminfos, RTEPermissionInfo::requiredPerms, rt_fetch, RTE_JOIN, RTE_RELATION, RangeTblEntry::rtekind, and RTEPermissionInfo::selectedCols.

Referenced by markVarForSelectPriv().

◆ markVarForSelectPriv()

void markVarForSelectPriv ( ParseState pstate,
Var var 
)

Definition at line 1150 of file parse_relation.c.

1151 {
1152  Index lv;
1153 
1154  Assert(IsA(var, Var));
1155  /* Find the appropriate pstate if it's an uplevel Var */
1156  for (lv = 0; lv < var->varlevelsup; lv++)
1157  pstate = pstate->parentParseState;
1158  markRTEForSelectPriv(pstate, var->varno, var->varattno);
1159 }
AttrNumber varattno
Definition: primnodes.h:238

References Assert(), IsA, markRTEForSelectPriv(), ParseState::parentParseState, Var::varattno, Var::varlevelsup, and Var::varno.

Referenced by expandNSItemAttrs(), ExpandSingleTable(), scanNSItemForColumn(), transformJoinUsingClause(), and transformWholeRowRef().

◆ parserOpenTable()

Relation parserOpenTable ( ParseState pstate,
const RangeVar relation,
int  lockmode 
)

Definition at line 1417 of file parse_relation.c.

1418 {
1419  Relation rel;
1420  ParseCallbackState pcbstate;
1421 
1422  setup_parser_errposition_callback(&pcbstate, pstate, relation->location);
1423  rel = table_openrv_extended(relation, lockmode, true);
1424  if (rel == NULL)
1425  {
1426  if (relation->schemaname)
1427  ereport(ERROR,
1429  errmsg("relation \"%s.%s\" does not exist",
1430  relation->schemaname, relation->relname)));
1431  else
1432  {
1433  /*
1434  * An unqualified name might have been meant as a reference to
1435  * some not-yet-in-scope CTE. The bare "does not exist" message
1436  * has proven remarkably unhelpful for figuring out such problems,
1437  * so we take pains to offer a specific hint.
1438  */
1439  if (isFutureCTE(pstate, relation->relname))
1440  ereport(ERROR,
1442  errmsg("relation \"%s\" does not exist",
1443  relation->relname),
1444  errdetail("There is a WITH item named \"%s\", but it cannot be referenced from this part of the query.",
1445  relation->relname),
1446  errhint("Use WITH RECURSIVE, or re-order the WITH items to remove forward references.")));
1447  else
1448  ereport(ERROR,
1450  errmsg("relation \"%s\" does not exist",
1451  relation->relname)));
1452  }
1453  }
1455  return rel;
1456 }
void cancel_parser_errposition_callback(ParseCallbackState *pcbstate)
Definition: parse_node.c:161
void setup_parser_errposition_callback(ParseCallbackState *pcbstate, ParseState *pstate, int location)
Definition: parse_node.c:145
static bool isFutureCTE(ParseState *pstate, const char *refname)
char * schemaname
Definition: primnodes.h:71
Relation table_openrv_extended(const RangeVar *relation, LOCKMODE lockmode, bool missing_ok)
Definition: table.c:103

References cancel_parser_errposition_callback(), ereport, errcode(), ERRCODE_UNDEFINED_TABLE, errdetail(), errhint(), errmsg(), ERROR, isFutureCTE(), RangeVar::location, RangeVar::relname, RangeVar::schemaname, setup_parser_errposition_callback(), and table_openrv_extended().

Referenced by addRangeTableEntry(), and setTargetTable().

◆ refnameNamespaceItem()

ParseNamespaceItem* refnameNamespaceItem ( ParseState pstate,
const char *  schemaname,
const char *  refname,
int  location,
int *  sublevels_up 
)

Definition at line 129 of file parse_relation.c.

134 {
135  Oid relId = InvalidOid;
136 
137  if (sublevels_up)
138  *sublevels_up = 0;
139 
140  if (schemaname != NULL)
141  {
142  Oid namespaceId;
143 
144  /*
145  * We can use LookupNamespaceNoError() here because we are only
146  * interested in finding existing RTEs. Checking USAGE permission on
147  * the schema is unnecessary since it would have already been checked
148  * when the RTE was made. Furthermore, we want to report "RTE not
149  * found", not "no permissions for schema", if the name happens to
150  * match a schema name the user hasn't got access to.
151  */
152  namespaceId = LookupNamespaceNoError(schemaname);
153  if (!OidIsValid(namespaceId))
154  return NULL;
155  relId = get_relname_relid(refname, namespaceId);
156  if (!OidIsValid(relId))
157  return NULL;
158  }
159 
160  while (pstate != NULL)
161  {
162  ParseNamespaceItem *result;
163 
164  if (OidIsValid(relId))
165  result = scanNameSpaceForRelid(pstate, relId, location);
166  else
167  result = scanNameSpaceForRefname(pstate, refname, location);
168 
169  if (result)
170  return result;
171 
172  if (sublevels_up)
173  (*sublevels_up)++;
174  else
175  break;
176 
177  pstate = pstate->parentParseState;
178  }
179  return NULL;
180 }
Oid get_relname_relid(const char *relname, Oid relnamespace)
Definition: lsyscache.c:1867
Oid LookupNamespaceNoError(const char *nspname)
Definition: namespace.c:2906
static ParseNamespaceItem * scanNameSpaceForRelid(ParseState *pstate, Oid relid, int location)
static ParseNamespaceItem * scanNameSpaceForRefname(ParseState *pstate, const char *refname, int location)

References get_relname_relid(), InvalidOid, LookupNamespaceNoError(), OidIsValid, ParseState::parentParseState, scanNameSpaceForRefname(), and scanNameSpaceForRelid().

Referenced by errorMissingRTE(), ExpandColumnRefStar(), and transformColumnRef().

◆ rte_visible_if_lateral()

static bool rte_visible_if_lateral ( ParseState pstate,
RangeTblEntry rte 
)
static

Definition at line 3782 of file parse_relation.c.

3783 {
3784  ParseNamespaceItem *nsitem;
3785 
3786  /* If LATERAL *is* active, we're clearly barking up the wrong tree */
3787  if (pstate->p_lateral_active)
3788  return false;
3789  nsitem = findNSItemForRTE(pstate, rte);
3790  if (nsitem)
3791  {
3792  /* Found it, report whether it's LATERAL-only */
3793  return nsitem->p_lateral_only && nsitem->p_lateral_ok;
3794  }
3795  return false;
3796 }
static ParseNamespaceItem * findNSItemForRTE(ParseState *pstate, RangeTblEntry *rte)

References findNSItemForRTE(), ParseState::p_lateral_active, ParseNamespaceItem::p_lateral_ok, and ParseNamespaceItem::p_lateral_only.

Referenced by errorMissingColumn(), and errorMissingRTE().

◆ rte_visible_if_qualified()

static bool rte_visible_if_qualified ( ParseState pstate,
RangeTblEntry rte 
)
static

Definition at line 3802 of file parse_relation.c.

3803 {
3804  ParseNamespaceItem *nsitem = findNSItemForRTE(pstate, rte);
3805 
3806  if (nsitem)
3807  {
3808  /* Found it, report whether it's relation-only */
3809  return nsitem->p_rel_visible && !nsitem->p_cols_visible;
3810  }
3811  return false;
3812 }

References findNSItemForRTE(), ParseNamespaceItem::p_cols_visible, and ParseNamespaceItem::p_rel_visible.

Referenced by errorMissingColumn().

◆ scanNameSpaceForCTE()

CommonTableExpr* scanNameSpaceForCTE ( ParseState pstate,
const char *  refname,
Index ctelevelsup 
)

Definition at line 282 of file parse_relation.c.

284 {
285  Index levelsup;
286 
287  for (levelsup = 0;
288  pstate != NULL;
289  pstate = pstate->parentParseState, levelsup++)
290  {
291  ListCell *lc;
292 
293  foreach(lc, pstate->p_ctenamespace)
294  {
295  CommonTableExpr *cte = (CommonTableExpr *) lfirst(lc);
296 
297  if (strcmp(cte->ctename, refname) == 0)
298  {
299  *ctelevelsup = levelsup;
300  return cte;
301  }
302  }
303  }
304  return NULL;
305 }

References CommonTableExpr::ctename, lfirst, ParseState::p_ctenamespace, and ParseState::parentParseState.

Referenced by getNSItemForSpecialRelationTypes(), and searchRangeTableForRel().

◆ scanNameSpaceForENR()

bool scanNameSpaceForENR ( ParseState pstate,
const char *  refname 
)

Definition at line 335 of file parse_relation.c.

336 {
337  return name_matches_visible_ENR(pstate, refname);
338 }
bool name_matches_visible_ENR(ParseState *pstate, const char *refname)
Definition: parse_enr.c:20

References name_matches_visible_ENR().

Referenced by getNSItemForSpecialRelationTypes(), searchRangeTableForRel(), and setTargetTable().

◆ scanNameSpaceForRefname()

static ParseNamespaceItem * scanNameSpaceForRefname ( ParseState pstate,
const char *  refname,
int  location 
)
static

Definition at line 200 of file parse_relation.c.

201 {
202  ParseNamespaceItem *result = NULL;
203  ListCell *l;
204 
205  foreach(l, pstate->p_namespace)
206  {
208 
209  /* Ignore columns-only items */
210  if (!nsitem->p_rel_visible)
211  continue;
212  /* If not inside LATERAL, ignore lateral-only items */
213  if (nsitem->p_lateral_only && !pstate->p_lateral_active)
214  continue;
215 
216  if (strcmp(nsitem->p_names->aliasname, refname) == 0)
217  {
218  if (result)
219  ereport(ERROR,
220  (errcode(ERRCODE_AMBIGUOUS_ALIAS),
221  errmsg("table reference \"%s\" is ambiguous",
222  refname),
223  parser_errposition(pstate, location)));
224  check_lateral_ref_ok(pstate, nsitem, location);
225  result = nsitem;
226  }
227  }
228  return result;
229 }

References Alias::aliasname, check_lateral_ref_ok(), ereport, errcode(), errmsg(), ERROR, lfirst, ParseState::p_lateral_active, ParseNamespaceItem::p_lateral_only, ParseNamespaceItem::p_names, ParseState::p_namespace, ParseNamespaceItem::p_rel_visible, and parser_errposition().

Referenced by refnameNamespaceItem().

◆ scanNameSpaceForRelid()

static ParseNamespaceItem * scanNameSpaceForRelid ( ParseState pstate,
Oid  relid,
int  location 
)
static

Definition at line 240 of file parse_relation.c.

241 {
242  ParseNamespaceItem *result = NULL;
243  ListCell *l;
244 
245  foreach(l, pstate->p_namespace)
246  {
248  RangeTblEntry *rte = nsitem->p_rte;
249 
250  /* Ignore columns-only items */
251  if (!nsitem->p_rel_visible)
252  continue;
253  /* If not inside LATERAL, ignore lateral-only items */
254  if (nsitem->p_lateral_only && !pstate->p_lateral_active)
255  continue;
256 
257  /* yes, the test for alias == NULL should be there... */
258  if (rte->rtekind == RTE_RELATION &&
259  rte->relid == relid &&
260  rte->alias == NULL)
261  {
262  if (result)
263  ereport(ERROR,
264  (errcode(ERRCODE_AMBIGUOUS_ALIAS),
265  errmsg("table reference %u is ambiguous",
266  relid),
267  parser_errposition(pstate, location)));
268  check_lateral_ref_ok(pstate, nsitem, location);
269  result = nsitem;
270  }
271  }
272  return result;
273 }

References RangeTblEntry::alias, check_lateral_ref_ok(), ereport, errcode(), errmsg(), ERROR, lfirst, ParseState::p_lateral_active, ParseNamespaceItem::p_lateral_only, ParseState::p_namespace, ParseNamespaceItem::p_rel_visible, ParseNamespaceItem::p_rte, parser_errposition(), RangeTblEntry::relid, RTE_RELATION, and RangeTblEntry::rtekind.

Referenced by refnameNamespaceItem().

◆ scanNSItemForColumn()

Node* scanNSItemForColumn ( ParseState pstate,
ParseNamespaceItem nsitem,
int  sublevels_up,
const char *  colname,
int  location 
)

Definition at line 680 of file parse_relation.c.

682 {
683  RangeTblEntry *rte = nsitem->p_rte;
684  int attnum;
685  Var *var;
686 
687  /*
688  * Scan the nsitem's column names (or aliases) for a match. Complain if
689  * multiple matches.
690  */
691  attnum = scanRTEForColumn(pstate, rte, nsitem->p_names,
692  colname, location,
693  0, NULL);
694 
695  if (attnum == InvalidAttrNumber)
696  return NULL; /* Return NULL if no match */
697 
698  /* In constraint check, no system column is allowed except tableOid */
699  if (pstate->p_expr_kind == EXPR_KIND_CHECK_CONSTRAINT &&
701  ereport(ERROR,
702  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
703  errmsg("system column \"%s\" reference in check constraint is invalid",
704  colname),
705  parser_errposition(pstate, location)));
706 
707  /* In generated column, no system column is allowed except tableOid */
708  if (pstate->p_expr_kind == EXPR_KIND_GENERATED_COLUMN &&
710  ereport(ERROR,
711  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
712  errmsg("cannot use system column \"%s\" in column generation expression",
713  colname),
714  parser_errposition(pstate, location)));
715 
716  /*
717  * In a MERGE WHEN condition, no system column is allowed except tableOid
718  */
719  if (pstate->p_expr_kind == EXPR_KIND_MERGE_WHEN &&
721  ereport(ERROR,
722  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
723  errmsg("cannot use system column \"%s\" in MERGE WHEN condition",
724  colname),
725  parser_errposition(pstate, location)));
726 
727  /* Found a valid match, so build a Var */
729  {
730  /* Get attribute data from the ParseNamespaceColumn array */
731  ParseNamespaceColumn *nscol = &nsitem->p_nscolumns[attnum - 1];
732 
733  /* Complain if dropped column. See notes in scanRTEForColumn. */
734  if (nscol->p_varno == 0)
735  ereport(ERROR,
736  (errcode(ERRCODE_UNDEFINED_COLUMN),
737  errmsg("column \"%s\" of relation \"%s\" does not exist",
738  colname,
739  nsitem->p_names->aliasname)));
740 
741  var = makeVar(nscol->p_varno,
742  nscol->p_varattno,
743  nscol->p_vartype,
744  nscol->p_vartypmod,
745  nscol->p_varcollid,
746  sublevels_up);
747  /* makeVar doesn't offer parameters for these, so set them by hand: */
748  var->varnosyn = nscol->p_varnosyn;
749  var->varattnosyn = nscol->p_varattnosyn;
750  }
751  else
752  {
753  /* System column, so use predetermined type data */
754  const FormData_pg_attribute *sysatt;
755 
757  var = makeVar(nsitem->p_rtindex,
758  attnum,
759  sysatt->atttypid,
760  sysatt->atttypmod,
761  sysatt->attcollation,
762  sublevels_up);
763  }
764  var->location = location;
765 
766  /* Mark Var if it's nulled by any outer joins */
767  markNullableIfNeeded(pstate, var);
768 
769  /* Require read access to the column */
770  markVarForSelectPriv(pstate, var);
771 
772  return (Node *) var;
773 }
@ EXPR_KIND_MERGE_WHEN
Definition: parse_node.h:58
@ EXPR_KIND_GENERATED_COLUMN
Definition: parse_node.h:82
@ EXPR_KIND_CHECK_CONSTRAINT
Definition: parse_node.h:67
static int scanRTEForColumn(ParseState *pstate, RangeTblEntry *rte, Alias *eref, const char *colname, int location, int fuzzy_rte_penalty, FuzzyAttrMatchState *fuzzystate)
ParseExprKind p_expr_kind
Definition: parse_node.h:210
#define TableOidAttributeNumber
Definition: sysattr.h:26

References Alias::aliasname, attnum, ereport, errcode(), errmsg(), ERROR, EXPR_KIND_CHECK_CONSTRAINT, EXPR_KIND_GENERATED_COLUMN, EXPR_KIND_MERGE_WHEN, FormData_pg_attribute, InvalidAttrNumber, Var::location, makeVar(), markNullableIfNeeded(), markVarForSelectPriv(), ParseState::p_expr_kind, ParseNamespaceItem::p_names, ParseNamespaceItem::p_nscolumns, ParseNamespaceItem::p_rte, ParseNamespaceItem::p_rtindex, ParseNamespaceColumn::p_varattno, ParseNamespaceColumn::p_varattnosyn, ParseNamespaceColumn::p_varcollid, ParseNamespaceColumn::p_varno, ParseNamespaceColumn::p_varnosyn, ParseNamespaceColumn::p_vartype, ParseNamespaceColumn::p_vartypmod, parser_errposition(), scanRTEForColumn(), SystemAttributeDefinition(), and TableOidAttributeNumber.

Referenced by colNameToVar(), ParseComplexProjection(), and transformColumnRef().

◆ scanRTEForColumn()

static int scanRTEForColumn ( ParseState pstate,
RangeTblEntry rte,
Alias eref,
const char *  colname,
int  location,
int  fuzzy_rte_penalty,
FuzzyAttrMatchState fuzzystate 
)
static

Definition at line 800 of file parse_relation.c.

805 {
806  int result = InvalidAttrNumber;
807  int attnum = 0;
808  ListCell *c;
809 
810  /*
811  * Scan the user column names (or aliases) for a match. Complain if
812  * multiple matches.
813  *
814  * Note: eref->colnames may include entries for dropped columns, but those
815  * will be empty strings that cannot match any legal SQL identifier, so we
816  * don't bother to test for that case here.
817  *
818  * Should this somehow go wrong and we try to access a dropped column,
819  * we'll still catch it by virtue of the check in scanNSItemForColumn().
820  * Callers interested in finding match with shortest distance need to
821  * defend against this directly, though.
822  */
823  foreach(c, eref->colnames)
824  {
825  const char *attcolname = strVal(lfirst(c));
826 
827  attnum++;
828  if (strcmp(attcolname, colname) == 0)
829  {
830  if (result)
831  ereport(ERROR,
832  (errcode(ERRCODE_AMBIGUOUS_COLUMN),
833  errmsg("column reference \"%s\" is ambiguous",
834  colname),
835  parser_errposition(pstate, location)));
836  result = attnum;
837  }
838 
839  /* Update fuzzy match state, if provided. */
840  if (fuzzystate != NULL)
841  updateFuzzyAttrMatchState(fuzzy_rte_penalty, fuzzystate,
842  rte, attcolname, colname, attnum);
843  }
844 
845  /*
846  * If we have a unique match, return it. Note that this allows a user
847  * alias to override a system column name (such as OID) without error.
848  */
849  if (result)
850  return result;
851 
852  /*
853  * If the RTE represents a real relation, consider system column names.
854  * Composites are only used for pseudo-relations like ON CONFLICT's
855  * excluded.
856  */
857  if (rte->rtekind == RTE_RELATION &&
858  rte->relkind != RELKIND_COMPOSITE_TYPE)
859  {
860  /* quick check to see if name could be a system column */
861  attnum = specialAttNum(colname);
862  if (attnum != InvalidAttrNumber)
863  {
864  /* now check to see if column actually is defined */
866  ObjectIdGetDatum(rte->relid),
868  result = attnum;
869  }
870  }
871 
872  return result;
873 }
static void updateFuzzyAttrMatchState(int fuzzy_rte_penalty, FuzzyAttrMatchState *fuzzystate, RangeTblEntry *rte, const char *actual, const char *match, int attnum)
char * c
#define SearchSysCacheExists2(cacheId, key1, key2)
Definition: syscache.h:193

References attnum, ATTNUM, Alias::colnames, ereport, errcode(), errmsg(), ERROR, Int16GetDatum(), InvalidAttrNumber, lfirst, ObjectIdGetDatum(), parser_errposition(), RangeTblEntry::relid, RangeTblEntry::relkind, RTE_RELATION, RangeTblEntry::rtekind, SearchSysCacheExists2, specialAttNum(), strVal, and updateFuzzyAttrMatchState().

Referenced by scanNSItemForColumn(), and searchRangeTableForCol().

◆ searchRangeTableForCol()

static FuzzyAttrMatchState* searchRangeTableForCol ( ParseState pstate,
const char *  alias,
const char *  colname,
int  location 
)
static

Definition at line 952 of file parse_relation.c.

954 {
955  ParseState *orig_pstate = pstate;
956  FuzzyAttrMatchState *fuzzystate = palloc(sizeof(FuzzyAttrMatchState));
957 
958  fuzzystate->distance = MAX_FUZZY_DISTANCE + 1;
959  fuzzystate->rfirst = NULL;
960  fuzzystate->rsecond = NULL;
961  fuzzystate->rexact1 = NULL;
962  fuzzystate->rexact2 = NULL;
963 
964  while (pstate != NULL)
965  {
966  ListCell *l;
967 
968  foreach(l, pstate->p_rtable)
969  {
970  RangeTblEntry *rte = (RangeTblEntry *) lfirst(l);
971  int fuzzy_rte_penalty = 0;
972  int attnum;
973 
974  /*
975  * Typically, it is not useful to look for matches within join
976  * RTEs; they effectively duplicate other RTEs for our purposes,
977  * and if a match is chosen from a join RTE, an unhelpful alias is
978  * displayed in the final diagnostic message.
979  */
980  if (rte->rtekind == RTE_JOIN)
981  continue;
982 
983  /*
984  * If the user didn't specify an alias, then matches against one
985  * RTE are as good as another. But if the user did specify an
986  * alias, then we want at least a fuzzy - and preferably an exact
987  * - match for the range table entry.
988  */
989  if (alias != NULL)
990  fuzzy_rte_penalty =
991  varstr_levenshtein_less_equal(alias, strlen(alias),
992  rte->eref->aliasname,
993  strlen(rte->eref->aliasname),
994  1, 1, 1,
995  MAX_FUZZY_DISTANCE + 1,
996  true);
997 
998  /*
999  * Scan for a matching column, and update fuzzystate. Non-exact
1000  * matches are dealt with inside scanRTEForColumn, but exact
1001  * matches are handled here. (There won't be more than one exact
1002  * match in the same RTE, else we'd have thrown error earlier.)
1003  */
1004  attnum = scanRTEForColumn(orig_pstate, rte, rte->eref,
1005  colname, location,
1006  fuzzy_rte_penalty, fuzzystate);
1007  if (attnum != InvalidAttrNumber && fuzzy_rte_penalty == 0)
1008  {
1009  if (fuzzystate->rexact1 == NULL)
1010  {
1011  fuzzystate->rexact1 = rte;
1012  fuzzystate->exact1 = attnum;
1013  }
1014  else
1015  {
1016  /* Needn't worry about overwriting previous rexact2 */
1017  fuzzystate->rexact2 = rte;
1018  fuzzystate->exact2 = attnum;
1019  }
1020  }
1021  }
1022 
1023  pstate = pstate->parentParseState;
1024  }
1025 
1026  return fuzzystate;
1027 }
#define MAX_FUZZY_DISTANCE
RangeTblEntry * rfirst
RangeTblEntry * rexact1
RangeTblEntry * rexact2
RangeTblEntry * rsecond
int varstr_levenshtein_less_equal(const char *source, int slen, const char *target, int tlen, int ins_c, int del_c, int sub_c, int max_d, bool trusted)

References Alias::aliasname, attnum, FuzzyAttrMatchState::distance, RangeTblEntry::eref, FuzzyAttrMatchState::exact1, FuzzyAttrMatchState::exact2, InvalidAttrNumber, lfirst, MAX_FUZZY_DISTANCE, ParseState::p_rtable, palloc(), ParseState::parentParseState, FuzzyAttrMatchState::rexact1, FuzzyAttrMatchState::rexact2, FuzzyAttrMatchState::rfirst, FuzzyAttrMatchState::rsecond, RTE_JOIN, RangeTblEntry::rtekind, scanRTEForColumn(), and varstr_levenshtein_less_equal().

Referenced by errorMissingColumn().

◆ searchRangeTableForRel()

static RangeTblEntry* searchRangeTableForRel ( ParseState pstate,
RangeVar relation 
)
static

Definition at line 356 of file parse_relation.c.

357 {
358  const char *refname = relation->relname;
359  Oid relId = InvalidOid;
360  CommonTableExpr *cte = NULL;
361  bool isenr = false;
362  Index ctelevelsup = 0;
363  Index levelsup;
364 
365  /*
366  * If it's an unqualified name, check for possible CTE matches. A CTE
367  * hides any real relation matches. If no CTE, look for a matching
368  * relation.
369  *
370  * NB: It's not critical that RangeVarGetRelid return the correct answer
371  * here in the face of concurrent DDL. If it doesn't, the worst case
372  * scenario is a less-clear error message. Also, the tables involved in
373  * the query are already locked, which reduces the number of cases in
374  * which surprising behavior can occur. So we do the name lookup
375  * unlocked.
376  */
377  if (!relation->schemaname)
378  {
379  cte = scanNameSpaceForCTE(pstate, refname, &ctelevelsup);
380  if (!cte)
381  isenr = scanNameSpaceForENR(pstate, refname);
382  }
383 
384  if (!cte && !isenr)
385  relId = RangeVarGetRelid(relation, NoLock, true);
386 
387  /* Now look for RTEs matching either the relation/CTE/ENR or the alias */
388  for (levelsup = 0;
389  pstate != NULL;
390  pstate = pstate->parentParseState, levelsup++)
391  {
392  ListCell *l;
393 
394  foreach(l, pstate->p_rtable)
395  {
396  RangeTblEntry *rte = (RangeTblEntry *) lfirst(l);
397 
398  if (rte->rtekind == RTE_RELATION &&
399  OidIsValid(relId) &&
400  rte->relid == relId)
401  return rte;
402  if (rte->rtekind == RTE_CTE &&
403  cte != NULL &&
404  rte->ctelevelsup + levelsup == ctelevelsup &&
405  strcmp(rte->ctename, refname) == 0)
406  return rte;
407  if (rte->rtekind == RTE_NAMEDTUPLESTORE &&
408  isenr &&
409  strcmp(rte->enrname, refname) == 0)
410  return rte;
411  if (strcmp(rte->eref->aliasname, refname) == 0)
412  return rte;
413  }
414  }
415  return NULL;
416 }
#define RangeVarGetRelid(relation, lockmode, missing_ok)
Definition: namespace.h:79
CommonTableExpr * scanNameSpaceForCTE(ParseState *pstate, const char *refname, Index *ctelevelsup)
bool scanNameSpaceForENR(ParseState *pstate, const char *refname)

References Alias::aliasname, RangeTblEntry::ctelevelsup, RangeTblEntry::ctename, RangeTblEntry::enrname, RangeTblEntry::eref, InvalidOid, lfirst, NoLock, OidIsValid, ParseState::p_rtable, ParseState::parentParseState, RangeVarGetRelid, RangeTblEntry::relid, RangeVar::relname, RTE_CTE, RTE_NAMEDTUPLESTORE, RTE_RELATION, RangeTblEntry::rtekind, scanNameSpaceForCTE(), scanNameSpaceForENR(), and RangeVar::schemaname.

Referenced by errorMissingRTE().

◆ specialAttNum()

static int specialAttNum ( const char *  attname)
static

Definition at line 3510 of file parse_relation.c.

3511 {
3512  const FormData_pg_attribute *sysatt;
3513 
3514  sysatt = SystemAttributeByName(attname);
3515  if (sysatt != NULL)
3516  return sysatt->attnum;
3517  return InvalidAttrNumber;
3518 }
const FormData_pg_attribute * SystemAttributeByName(const char *attname)
Definition: heap.c:251

References attname, FormData_pg_attribute, InvalidAttrNumber, and SystemAttributeByName().

Referenced by attnameAttNum(), and scanRTEForColumn().

◆ updateFuzzyAttrMatchState()

static void updateFuzzyAttrMatchState ( int  fuzzy_rte_penalty,
FuzzyAttrMatchState fuzzystate,
RangeTblEntry rte,
const char *  actual,
const char *  match,
int  attnum 
)
static

Definition at line 587 of file parse_relation.c.

590 {
591  int columndistance;
592  int matchlen;
593 
594  /* Bail before computing the Levenshtein distance if there's no hope. */
595  if (fuzzy_rte_penalty > fuzzystate->distance)
596  return;
597 
598  /*
599  * Outright reject dropped columns, which can appear here with apparent
600  * empty actual names, per remarks within scanRTEForColumn().
601  */
602  if (actual[0] == '\0')
603  return;
604 
605  /* Use Levenshtein to compute match distance. */
606  matchlen = strlen(match);
607  columndistance =
608  varstr_levenshtein_less_equal(actual, strlen(actual), match, matchlen,
609  1, 1, 1,
610  fuzzystate->distance + 1
611  - fuzzy_rte_penalty,
612  true);
613 
614  /*
615  * If more than half the characters are different, don't treat it as a
616  * match, to avoid making ridiculous suggestions.
617  */
618  if (columndistance > matchlen / 2)
619  return;
620 
621  /*
622  * From this point on, we can ignore the distinction between the RTE-name
623  * distance and the column-name distance.
624  */
625  columndistance += fuzzy_rte_penalty;
626 
627  /*
628  * If the new distance is less than or equal to that of the best match
629  * found so far, update fuzzystate.
630  */
631  if (columndistance < fuzzystate->distance)
632  {
633  /* Store new lowest observed distance as first/only match */
634  fuzzystate->distance = columndistance;
635  fuzzystate->rfirst = rte;
636  fuzzystate->first = attnum;
637  fuzzystate->rsecond = NULL;
638  }
639  else if (columndistance == fuzzystate->distance)
640  {
641  /* If we already have a match of this distance, update state */
642  if (fuzzystate->rsecond != NULL)
643  {
644  /*
645  * Too many matches at same distance. Clearly, this value of
646  * distance is too low a bar, so drop these entries while keeping
647  * the current distance value, so that only smaller distances will
648  * be considered interesting. Only if we find something of lower
649  * distance will we re-populate rfirst (via the stanza above).
650  */
651  fuzzystate->rfirst = NULL;
652  fuzzystate->rsecond = NULL;
653  }
654  else if (fuzzystate->rfirst != NULL)
655  {
656  /* Record as provisional second match */
657  fuzzystate->rsecond = rte;
658  fuzzystate->second = attnum;
659  }
660  else
661  {
662  /*
663  * Do nothing. When rfirst is NULL, distance is more than what we
664  * want to consider acceptable, so we should ignore this match.
665  */
666  }
667  }
668 }

References attnum, FuzzyAttrMatchState::distance, FuzzyAttrMatchState::first, FuzzyAttrMatchState::rfirst, FuzzyAttrMatchState::rsecond, FuzzyAttrMatchState::second, and varstr_levenshtein_less_equal().

Referenced by scanRTEForColumn().