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 2619 of file parse_relation.c.

2622 {
2623  if (addToJoinList)
2624  {
2626 
2627  rtr->rtindex = nsitem->p_rtindex;
2628  pstate->p_joinlist = lappend(pstate->p_joinlist, rtr);
2629  }
2630  if (addToRelNameSpace || addToVarNameSpace)
2631  {
2632  /* Set the new nsitem's visibility flags correctly */
2633  nsitem->p_rel_visible = addToRelNameSpace;
2634  nsitem->p_cols_visible = addToVarNameSpace;
2635  nsitem->p_lateral_only = false;
2636  nsitem->p_lateral_ok = true;
2637  pstate->p_namespace = lappend(pstate->p_namespace, nsitem);
2638  }
2639 }
List * lappend(List *list, void *datum)
Definition: list.c:339
#define makeNode(_type_)
Definition: nodes.h:155
List * p_namespace
Definition: parse_node.h:201
List * p_joinlist
Definition: parse_node.h:199

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 1470 of file parse_relation.c.

1475 {
1477  RTEPermissionInfo *perminfo;
1478  char *refname = alias ? alias->aliasname : relation->relname;
1479  LOCKMODE lockmode;
1480  Relation rel;
1481  ParseNamespaceItem *nsitem;
1482 
1483  Assert(pstate != NULL);
1484 
1485  rte->rtekind = RTE_RELATION;
1486  rte->alias = alias;
1487 
1488  /*
1489  * Identify the type of lock we'll need on this relation. It's not the
1490  * query's target table (that case is handled elsewhere), so we need
1491  * either RowShareLock if it's locked by FOR UPDATE/SHARE, or plain
1492  * AccessShareLock otherwise.
1493  */
1494  lockmode = isLockedRefname(pstate, refname) ? RowShareLock : AccessShareLock;
1495 
1496  /*
1497  * Get the rel's OID. This access also ensures that we have an up-to-date
1498  * relcache entry for the rel. Since this is typically the first access
1499  * to a rel in a statement, we must open the rel with the proper lockmode.
1500  */
1501  rel = parserOpenTable(pstate, relation, lockmode);
1502  rte->relid = RelationGetRelid(rel);
1503  rte->inh = inh;
1504  rte->relkind = rel->rd_rel->relkind;
1505  rte->rellockmode = lockmode;
1506 
1507  /*
1508  * Build the list of effective column names using user-supplied aliases
1509  * and/or actual column names.
1510  */
1511  rte->eref = makeAlias(refname, NIL);
1512  buildRelationAliases(rel->rd_att, alias, rte->eref);
1513 
1514  /*
1515  * Set flags and initialize access permissions.
1516  *
1517  * The initial default on access checks is always check-for-READ-access,
1518  * which is the right thing for all except target tables.
1519  */
1520  rte->lateral = false;
1521  rte->inFromCl = inFromCl;
1522 
1523  perminfo = addRTEPermissionInfo(&pstate->p_rteperminfos, rte);
1524  perminfo->requiredPerms = ACL_SELECT;
1525 
1526  /*
1527  * Add completed RTE to pstate's range table list, so that we know its
1528  * index. But we don't add it to the join list --- caller must do that if
1529  * appropriate.
1530  */
1531  pstate->p_rtable = lappend(pstate->p_rtable, rte);
1532 
1533  /*
1534  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
1535  * list --- caller must do that if appropriate.
1536  */
1537  nsitem = buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable),
1538  perminfo, rel->rd_att);
1539 
1540  /*
1541  * Drop the rel refcount, but keep the access lock till end of transaction
1542  * so that the table can't be deleted or have its schema modified
1543  * underneath us.
1544  */
1545  table_close(rel, NoLock);
1546 
1547  return nsitem;
1548 }
#define Assert(condition)
Definition: c.h:858
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:389
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:1028
#define ACL_SELECT
Definition: parsenodes.h:77
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:505
char * aliasname
Definition: primnodes.h:50
List * p_rteperminfos
Definition: parse_node.h:195
List * p_rtable
Definition: parse_node.h:194
AclMode requiredPerms
Definition: parsenodes.h:1295
RTEKind rtekind
Definition: parsenodes.h:1057
char * relname
Definition: primnodes.h:82
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(), Alias::aliasname, Assert, buildNSItemFromTupleDesc(), buildRelationAliases(), RangeTblEntry::inh, isLockedRefname(), lappend(), list_length(), makeAlias(), makeNode, NIL, NoLock, ParseState::p_rtable, ParseState::p_rteperminfos, parserOpenTable(), RelationData::rd_att, RelationData::rd_rel, RelationGetRelid, RangeTblEntry::relid, 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 2314 of file parse_relation.c.

2319 {
2321  Alias *alias = rv->alias;
2322  char *refname = alias ? alias->aliasname : cte->ctename;
2323  Alias *eref;
2324  int numaliases;
2325  int varattno;
2326  ListCell *lc;
2327  int n_dontexpand_columns = 0;
2328  ParseNamespaceItem *psi;
2329 
2330  Assert(pstate != NULL);
2331 
2332  rte->rtekind = RTE_CTE;
2333  rte->ctename = cte->ctename;
2334  rte->ctelevelsup = levelsup;
2335 
2336  /* Self-reference if and only if CTE's parse analysis isn't completed */
2337  rte->self_reference = !IsA(cte->ctequery, Query);
2338  Assert(cte->cterecursive || !rte->self_reference);
2339  /* Bump the CTE's refcount if this isn't a self-reference */
2340  if (!rte->self_reference)
2341  cte->cterefcount++;
2342 
2343  /*
2344  * We throw error if the CTE is INSERT/UPDATE/DELETE/MERGE without
2345  * RETURNING. This won't get checked in case of a self-reference, but
2346  * that's OK because data-modifying CTEs aren't allowed to be recursive
2347  * anyhow.
2348  */
2349  if (IsA(cte->ctequery, Query))
2350  {
2351  Query *ctequery = (Query *) cte->ctequery;
2352 
2353  if (ctequery->commandType != CMD_SELECT &&
2354  ctequery->returningList == NIL)
2355  ereport(ERROR,
2356  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2357  errmsg("WITH query \"%s\" does not have a RETURNING clause",
2358  cte->ctename),
2359  parser_errposition(pstate, rv->location)));
2360  }
2361 
2362  rte->coltypes = list_copy(cte->ctecoltypes);
2363  rte->coltypmods = list_copy(cte->ctecoltypmods);
2364  rte->colcollations = list_copy(cte->ctecolcollations);
2365 
2366  rte->alias = alias;
2367  if (alias)
2368  eref = copyObject(alias);
2369  else
2370  eref = makeAlias(refname, NIL);
2371  numaliases = list_length(eref->colnames);
2372 
2373  /* fill in any unspecified alias columns */
2374  varattno = 0;
2375  foreach(lc, cte->ctecolnames)
2376  {
2377  varattno++;
2378  if (varattno > numaliases)
2379  eref->colnames = lappend(eref->colnames, lfirst(lc));
2380  }
2381  if (varattno < numaliases)
2382  ereport(ERROR,
2383  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2384  errmsg("table \"%s\" has %d columns available but %d columns specified",
2385  refname, varattno, numaliases)));
2386 
2387  rte->eref = eref;
2388 
2389  if (cte->search_clause)
2390  {
2391  rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->search_clause->search_seq_column));
2392  if (cte->search_clause->search_breadth_first)
2393  rte->coltypes = lappend_oid(rte->coltypes, RECORDOID);
2394  else
2395  rte->coltypes = lappend_oid(rte->coltypes, RECORDARRAYOID);
2396  rte->coltypmods = lappend_int(rte->coltypmods, -1);
2397  rte->colcollations = lappend_oid(rte->colcollations, InvalidOid);
2398 
2399  n_dontexpand_columns += 1;
2400  }
2401 
2402  if (cte->cycle_clause)
2403  {
2404  rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->cycle_clause->cycle_mark_column));
2405  rte->coltypes = lappend_oid(rte->coltypes, cte->cycle_clause->cycle_mark_type);
2406  rte->coltypmods = lappend_int(rte->coltypmods, cte->cycle_clause->cycle_mark_typmod);
2407  rte->colcollations = lappend_oid(rte->colcollations, cte->cycle_clause->cycle_mark_collation);
2408 
2409  rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->cycle_clause->cycle_path_column));
2410  rte->coltypes = lappend_oid(rte->coltypes, RECORDARRAYOID);
2411  rte->coltypmods = lappend_int(rte->coltypmods, -1);
2412  rte->colcollations = lappend_oid(rte->colcollations, InvalidOid);
2413 
2414  n_dontexpand_columns += 2;
2415  }
2416 
2417  /*
2418  * Set flags and access permissions.
2419  *
2420  * Subqueries are never checked for access rights, so no need to perform
2421  * addRTEPermissionInfo().
2422  */
2423  rte->lateral = false;
2424  rte->inFromCl = inFromCl;
2425 
2426  /*
2427  * Add completed RTE to pstate's range table list, so that we know its
2428  * index. But we don't add it to the join list --- caller must do that if
2429  * appropriate.
2430  */
2431  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2432 
2433  /*
2434  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2435  * list --- caller must do that if appropriate.
2436  */
2437  psi = buildNSItemFromLists(rte, list_length(pstate->p_rtable),
2438  rte->coltypes, rte->coltypmods,
2439  rte->colcollations);
2440 
2441  /*
2442  * The columns added by search and cycle clauses are not included in star
2443  * expansion in queries contained in the CTE.
2444  */
2445  if (rte->ctelevelsup > 0)
2446  for (int i = 0; i < n_dontexpand_columns; i++)
2447  psi->p_nscolumns[list_length(psi->p_names->colnames) - 1 - i].p_dontexpand = true;
2448 
2449  return psi;
2450 }
int errcode(int sqlerrcode)
Definition: elog.c:859
int errmsg(const char *fmt,...)
Definition: elog.c:1072
#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:357
List * lappend_oid(List *list, Oid datum)
Definition: list.c:375
List * list_copy(const List *oldlist)
Definition: list.c:1573
#define IsA(nodeptr, _type_)
Definition: nodes.h:158
#define copyObject(obj)
Definition: nodes.h:224
@ CMD_SELECT
Definition: nodes.h:265
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:106
static ParseNamespaceItem * buildNSItemFromLists(RangeTblEntry *rte, Index rtindex, List *coltypes, List *coltypmods, List *colcollations)
@ RTE_CTE
Definition: parsenodes.h:1034
#define lfirst(lc)
Definition: pg_list.h:172
#define InvalidOid
Definition: postgres_ext.h:36
List * colnames
Definition: primnodes.h:51
ParseNamespaceColumn * p_nscolumns
Definition: parse_node.h:291
List * returningList
Definition: parsenodes.h:198
CmdType commandType
Definition: parsenodes.h:121
char * ctename
Definition: parsenodes.h:1206
Index ctelevelsup
Definition: parsenodes.h:1208
Alias * alias
Definition: primnodes.h:91
ParseLoc location
Definition: primnodes.h:94
String * makeString(char *str)
Definition: value.c:63

References RangeVar::alias, Alias::aliasname, Assert, buildNSItemFromLists(), CMD_SELECT, Alias::colnames, Query::commandType, copyObject, RangeTblEntry::ctelevelsup, RangeTblEntry::ctename, CommonTableExpr::ctename, CommonTableExpr::ctequery, ereport, errcode(), errmsg(), ERROR, i, if(), InvalidOid, IsA, lappend(), lappend_int(), lappend_oid(), 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, and RangeTblEntry::rtekind.

Referenced by getNSItemForSpecialRelationTypes().

◆ addRangeTableEntryForENR()

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

Definition at line 2466 of file parse_relation.c.

2469 {
2471  Alias *alias = rv->alias;
2472  char *refname = alias ? alias->aliasname : rv->relname;
2474  TupleDesc tupdesc;
2475  int attno;
2476 
2477  Assert(pstate != NULL);
2478  enrmd = get_visible_ENR(pstate, rv->relname);
2479  Assert(enrmd != NULL);
2480 
2481  switch (enrmd->enrtype)
2482  {
2483  case ENR_NAMED_TUPLESTORE:
2485  break;
2486 
2487  default:
2488  elog(ERROR, "unexpected enrtype: %d", enrmd->enrtype);
2489  return NULL; /* for fussy compilers */
2490  }
2491 
2492  /*
2493  * Record dependency on a relation. This allows plans to be invalidated
2494  * if they access transition tables linked to a table that is altered.
2495  */
2496  rte->relid = enrmd->reliddesc;
2497 
2498  /*
2499  * Build the list of effective column names using user-supplied aliases
2500  * and/or actual column names.
2501  */
2502  tupdesc = ENRMetadataGetTupDesc(enrmd);
2503  rte->eref = makeAlias(refname, NIL);
2504  buildRelationAliases(tupdesc, alias, rte->eref);
2505 
2506  /* Record additional data for ENR, including column type info */
2507  rte->enrname = enrmd->name;
2508  rte->enrtuples = enrmd->enrtuples;
2509  rte->coltypes = NIL;
2510  rte->coltypmods = NIL;
2511  rte->colcollations = NIL;
2512  for (attno = 1; attno <= tupdesc->natts; ++attno)
2513  {
2514  Form_pg_attribute att = TupleDescAttr(tupdesc, attno - 1);
2515 
2516  if (att->attisdropped)
2517  {
2518  /* Record zeroes for a dropped column */
2519  rte->coltypes = lappend_oid(rte->coltypes, InvalidOid);
2520  rte->coltypmods = lappend_int(rte->coltypmods, 0);
2521  rte->colcollations = lappend_oid(rte->colcollations, InvalidOid);
2522  }
2523  else
2524  {
2525  /* Let's just make sure we can tell this isn't dropped */
2526  if (att->atttypid == InvalidOid)
2527  elog(ERROR, "atttypid is invalid for non-dropped column in \"%s\"",
2528  rv->relname);
2529  rte->coltypes = lappend_oid(rte->coltypes, att->atttypid);
2530  rte->coltypmods = lappend_int(rte->coltypmods, att->atttypmod);
2531  rte->colcollations = lappend_oid(rte->colcollations,
2532  att->attcollation);
2533  }
2534  }
2535 
2536  /*
2537  * Set flags and access permissions.
2538  *
2539  * ENRs are never checked for access rights, so no need to perform
2540  * addRTEPermissionInfo().
2541  */
2542  rte->lateral = false;
2543  rte->inFromCl = inFromCl;
2544 
2545  /*
2546  * Add completed RTE to pstate's range table list, so that we know its
2547  * index. But we don't add it to the join list --- caller must do that if
2548  * appropriate.
2549  */
2550  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2551 
2552  /*
2553  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2554  * list --- caller must do that if appropriate.
2555  */
2556  return buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable), NULL,
2557  tupdesc);
2558 }
#define elog(elevel,...)
Definition: elog.h:224
EphemeralNamedRelationMetadata get_visible_ENR(ParseState *pstate, const char *refname)
Definition: parse_enr.c:26
@ RTE_NAMEDTUPLESTORE
Definition: parsenodes.h:1035
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:1241
#define TupleDescAttr(tupdesc, i)
Definition: tupdesc.h:92

References RangeVar::alias, Alias::aliasname, Assert, buildNSItemFromTupleDesc(), buildRelationAliases(), elog, ENR_NAMED_TUPLESTORE, ENRMetadataGetTupDesc(), RangeTblEntry::enrname, EphemeralNamedRelationMetadataData::enrtuples, EphemeralNamedRelationMetadataData::enrtype, ERROR, get_visible_ENR(), InvalidOid, lappend(), lappend_int(), lappend_oid(), 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->inFromCl = inFromCl;
2026 
2027  /*
2028  * Add completed RTE to pstate's range table list, so that we know its
2029  * index. But we don't add it to the join list --- caller must do that if
2030  * appropriate.
2031  */
2032  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2033 
2034  /*
2035  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2036  * list --- caller must do that if appropriate.
2037  */
2038  return buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable), NULL,
2039  tupdesc);
2040 }
int16 AttrNumber
Definition: attnum.h:21
signed int int32
Definition: c.h:494
char * format_type_be(Oid type_oid)
Definition: format_type.c:343
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:456
#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:1695
void * palloc(Size size)
Definition: mcxt.c:1316
Oid exprType(const Node *expr)
Definition: nodeFuncs.c:42
int32 exprTypmod(const Node *expr)
Definition: nodeFuncs.c:298
Oid exprCollation(const Node *expr)
Definition: nodeFuncs.c:816
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1386
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, const ColumnDef *coldef, Oid typeOid)
Definition: parse_type.c:540
@ RTE_FUNCTION
Definition: parsenodes.h:1031
#define forthree(cell1, list1, cell2, list2, cell3, list3)
Definition: pg_list.h:563
#define linitial(l)
Definition: pg_list.h:178
unsigned int Oid
Definition: postgres_ext.h:31
char * colname
Definition: parsenodes.h:726
TypeName * typeName
Definition: parsenodes.h:727
ParseLoc location
Definition: parsenodes.h:745
Definition: pg_list.h:54
Definition: nodes.h:129
Alias * alias
Definition: parsenodes.h:644
bool funcordinality
Definition: parsenodes.h:1189
Query * subquery
Definition: parsenodes.h:1114
List * functions
Definition: parsenodes.h:1187
bool setof
Definition: parsenodes.h:270
TupleDesc CreateTemplateTupleDesc(int natts)
Definition: tupdesc.c:67
void TupleDescInitEntryCollation(TupleDesc desc, AttrNumber attributeNumber, Oid collationid)
Definition: tupdesc.c:833
void TupleDescInitEntry(TupleDesc desc, AttrNumber attributeNumber, const char *attributeName, Oid oidtypeid, int32 typmod, int attdim)
Definition: tupdesc.c:651
void TupleDescCopyEntry(TupleDesc dst, AttrNumber dstAttno, TupleDesc src, AttrNumber srcAttno)
Definition: tupdesc.c:289

References RangeFunction::alias, Alias::aliasname, Assert, buildNSItemFromTupleDesc(), buildRelationAliases(), CheckAttributeNamesTypes(), CHKATYPE_ANYRECORD, chooseScalarFunctionAlias(), ColumnDef::colname, CreateTemplateTupleDesc(), 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, InvalidOid, j, lappend(), lappend_int(), lappend_oid(), 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 2216 of file parse_relation.c.

2227 {
2229  Alias *eref;
2230  int numaliases;
2231  ParseNamespaceItem *nsitem;
2232 
2233  Assert(pstate != NULL);
2234 
2235  /*
2236  * Fail if join has too many columns --- we must be able to reference any
2237  * of the columns with an AttrNumber.
2238  */
2239  if (list_length(aliasvars) > MaxAttrNumber)
2240  ereport(ERROR,
2241  (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
2242  errmsg("joins can have at most %d columns",
2243  MaxAttrNumber)));
2244 
2245  rte->rtekind = RTE_JOIN;
2246  rte->relid = InvalidOid;
2247  rte->subquery = NULL;
2248  rte->jointype = jointype;
2249  rte->joinmergedcols = nummergedcols;
2250  rte->joinaliasvars = aliasvars;
2251  rte->joinleftcols = leftcols;
2252  rte->joinrightcols = rightcols;
2253  rte->join_using_alias = join_using_alias;
2254  rte->alias = alias;
2255 
2256  eref = alias ? copyObject(alias) : makeAlias("unnamed_join", NIL);
2257  numaliases = list_length(eref->colnames);
2258 
2259  /* fill in any unspecified alias columns */
2260  if (numaliases < list_length(colnames))
2261  eref->colnames = list_concat(eref->colnames,
2262  list_copy_tail(colnames, numaliases));
2263 
2264  if (numaliases > list_length(colnames))
2265  ereport(ERROR,
2266  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2267  errmsg("join expression \"%s\" has %d columns available but %d columns specified",
2268  eref->aliasname, list_length(colnames), numaliases)));
2269 
2270  rte->eref = eref;
2271 
2272  /*
2273  * Set flags and access permissions.
2274  *
2275  * Joins are never checked for access rights, so no need to perform
2276  * addRTEPermissionInfo().
2277  */
2278  rte->lateral = false;
2279  rte->inFromCl = inFromCl;
2280 
2281  /*
2282  * Add completed RTE to pstate's range table list, so that we know its
2283  * index. But we don't add it to the join list --- caller must do that if
2284  * appropriate.
2285  */
2286  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2287 
2288  /*
2289  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2290  * list --- caller must do that if appropriate.
2291  */
2292  nsitem = (ParseNamespaceItem *) palloc(sizeof(ParseNamespaceItem));
2293  nsitem->p_names = rte->eref;
2294  nsitem->p_rte = rte;
2295  nsitem->p_perminfo = NULL;
2296  nsitem->p_rtindex = list_length(pstate->p_rtable);
2297  nsitem->p_nscolumns = nscolumns;
2298  /* set default visibility flags; might get changed later */
2299  nsitem->p_rel_visible = true;
2300  nsitem->p_cols_visible = true;
2301  nsitem->p_lateral_only = false;
2302  nsitem->p_lateral_ok = true;
2303 
2304  return nsitem;
2305 }
#define MaxAttrNumber
Definition: attnum.h:24
List * list_copy_tail(const List *oldlist, int nskip)
Definition: list.c:1613
List * list_concat(List *list1, const List *list2)
Definition: list.c:561
@ RTE_JOIN
Definition: parsenodes.h:1030
RangeTblEntry * p_rte
Definition: parse_node.h:287
RTEPermissionInfo * p_perminfo
Definition: parse_node.h:289
JoinType jointype
Definition: parsenodes.h:1161

References Alias::aliasname, Assert, Alias::colnames, copyObject, ereport, errcode(), errmsg(), ERROR, InvalidOid, RangeTblEntry::jointype, lappend(), 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 1567 of file parse_relation.c.

1573 {
1575  RTEPermissionInfo *perminfo;
1576  char *refname = alias ? alias->aliasname : RelationGetRelationName(rel);
1577 
1578  Assert(pstate != NULL);
1579 
1580  Assert(lockmode == AccessShareLock ||
1581  lockmode == RowShareLock ||
1582  lockmode == RowExclusiveLock);
1583  Assert(CheckRelationLockedByMe(rel, lockmode, true));
1584 
1585  rte->rtekind = RTE_RELATION;
1586  rte->alias = alias;
1587  rte->relid = RelationGetRelid(rel);
1588  rte->inh = inh;
1589  rte->relkind = rel->rd_rel->relkind;
1590  rte->rellockmode = lockmode;
1591 
1592  /*
1593  * Build the list of effective column names using user-supplied aliases
1594  * and/or actual column names.
1595  */
1596  rte->eref = makeAlias(refname, NIL);
1597  buildRelationAliases(rel->rd_att, alias, rte->eref);
1598 
1599  /*
1600  * Set flags and initialize access permissions.
1601  *
1602  * The initial default on access checks is always check-for-READ-access,
1603  * which is the right thing for all except target tables.
1604  */
1605  rte->lateral = false;
1606  rte->inFromCl = inFromCl;
1607 
1608  perminfo = addRTEPermissionInfo(&pstate->p_rteperminfos, rte);
1609  perminfo->requiredPerms = ACL_SELECT;
1610 
1611  /*
1612  * Add completed RTE to pstate's range table list, so that we know its
1613  * index. But we don't add it to the join list --- caller must do that if
1614  * appropriate.
1615  */
1616  pstate->p_rtable = lappend(pstate->p_rtable, rte);
1617 
1618  /*
1619  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
1620  * list --- caller must do that if appropriate.
1621  */
1622  return buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable),
1623  perminfo, rel->rd_att);
1624 }
bool CheckRelationLockedByMe(Relation relation, LOCKMODE lockmode, bool orstronger)
Definition: lmgr.c:330
#define RowExclusiveLock
Definition: lockdefs.h:38
#define RelationGetRelationName(relation)
Definition: rel.h:539

References AccessShareLock, ACL_SELECT, addRTEPermissionInfo(), Alias::aliasname, Assert, buildNSItemFromTupleDesc(), buildRelationAliases(), CheckRelationLockedByMe(), RangeTblEntry::inh, lappend(), list_length(), makeAlias(), makeNode, NIL, ParseState::p_rtable, ParseState::p_rteperminfos, RelationData::rd_att, RelationData::rd_rel, RelationGetRelationName, RelationGetRelid, RangeTblEntry::relid, 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 1638 of file parse_relation.c.

1643 {
1645  Alias *eref;
1646  int numaliases;
1647  List *coltypes,
1648  *coltypmods,
1649  *colcollations;
1650  int varattno;
1651  ListCell *tlistitem;
1652  ParseNamespaceItem *nsitem;
1653 
1654  Assert(pstate != NULL);
1655 
1656  rte->rtekind = RTE_SUBQUERY;
1657  rte->subquery = subquery;
1658  rte->alias = alias;
1659 
1660  eref = alias ? copyObject(alias) : makeAlias("unnamed_subquery", NIL);
1661  numaliases = list_length(eref->colnames);
1662 
1663  /* fill in any unspecified alias columns, and extract column type info */
1664  coltypes = coltypmods = colcollations = NIL;
1665  varattno = 0;
1666  foreach(tlistitem, subquery->targetList)
1667  {
1668  TargetEntry *te = (TargetEntry *) lfirst(tlistitem);
1669 
1670  if (te->resjunk)
1671  continue;
1672  varattno++;
1673  Assert(varattno == te->resno);
1674  if (varattno > numaliases)
1675  {
1676  char *attrname;
1677 
1678  attrname = pstrdup(te->resname);
1679  eref->colnames = lappend(eref->colnames, makeString(attrname));
1680  }
1681  coltypes = lappend_oid(coltypes,
1682  exprType((Node *) te->expr));
1683  coltypmods = lappend_int(coltypmods,
1684  exprTypmod((Node *) te->expr));
1685  colcollations = lappend_oid(colcollations,
1686  exprCollation((Node *) te->expr));
1687  }
1688  if (varattno < numaliases)
1689  ereport(ERROR,
1690  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
1691  errmsg("table \"%s\" has %d columns available but %d columns specified",
1692  eref->aliasname, varattno, numaliases)));
1693 
1694  rte->eref = eref;
1695 
1696  /*
1697  * Set flags.
1698  *
1699  * Subqueries are never checked for access rights, so no need to perform
1700  * addRTEPermissionInfo().
1701  */
1702  rte->lateral = lateral;
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:1029
List * targetList
Definition: parsenodes.h:191
Expr * expr
Definition: primnodes.h:2157
AttrNumber resno
Definition: primnodes.h:2159

References Alias::aliasname, Assert, buildNSItemFromLists(), Alias::colnames, copyObject, ereport, errcode(), errmsg(), ERROR, TargetEntry::expr, exprCollation(), exprType(), exprTypmod(), lappend(), lappend_int(), lappend_oid(), 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 2049 of file parse_relation.c.

2054 {
2056  char *refname;
2057  Alias *eref;
2058  int numaliases;
2059 
2060  Assert(pstate != NULL);
2061 
2062  /* Disallow more columns than will fit in a tuple */
2063  if (list_length(tf->colnames) > MaxTupleAttributeNumber)
2064  ereport(ERROR,
2065  (errcode(ERRCODE_TOO_MANY_COLUMNS),
2066  errmsg("functions in FROM can return at most %d columns",
2068  parser_errposition(pstate,
2069  exprLocation((Node *) tf))));
2070  Assert(list_length(tf->coltypes) == list_length(tf->colnames));
2071  Assert(list_length(tf->coltypmods) == list_length(tf->colnames));
2072  Assert(list_length(tf->colcollations) == list_length(tf->colnames));
2073 
2074  rte->rtekind = RTE_TABLEFUNC;
2075  rte->relid = InvalidOid;
2076  rte->subquery = NULL;
2077  rte->tablefunc = tf;
2078  rte->coltypes = tf->coltypes;
2079  rte->coltypmods = tf->coltypmods;
2080  rte->colcollations = tf->colcollations;
2081  rte->alias = alias;
2082 
2083  refname = alias ? alias->aliasname :
2084  pstrdup(tf->functype == TFT_XMLTABLE ? "xmltable" : "json_table");
2085  eref = alias ? copyObject(alias) : makeAlias(refname, NIL);
2086  numaliases = list_length(eref->colnames);
2087 
2088  /* fill in any unspecified alias columns */
2089  if (numaliases < list_length(tf->colnames))
2090  eref->colnames = list_concat(eref->colnames,
2091  list_copy_tail(tf->colnames, numaliases));
2092 
2093  if (numaliases > list_length(tf->colnames))
2094  ereport(ERROR,
2095  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2096  errmsg("%s function has %d columns available but %d columns specified",
2097  tf->functype == TFT_XMLTABLE ? "XMLTABLE" : "JSON_TABLE",
2098  list_length(tf->colnames), numaliases)));
2099 
2100  rte->eref = eref;
2101 
2102  /*
2103  * Set flags and access permissions.
2104  *
2105  * Tablefuncs are never checked for access rights (at least, not by
2106  * ExecCheckPermissions()), so no need to perform addRTEPermissionInfo().
2107  */
2108  rte->lateral = lateral;
2109  rte->inFromCl = inFromCl;
2110 
2111  /*
2112  * Add completed RTE to pstate's range table list, so that we know its
2113  * index. But we don't add it to the join list --- caller must do that if
2114  * appropriate.
2115  */
2116  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2117 
2118  /*
2119  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2120  * list --- caller must do that if appropriate.
2121  */
2122  return buildNSItemFromLists(rte, list_length(pstate->p_rtable),
2123  rte->coltypes, rte->coltypmods,
2124  rte->colcollations);
2125 }
@ RTE_TABLEFUNC
Definition: parsenodes.h:1032
@ TFT_XMLTABLE
Definition: primnodes.h:99
TableFunc * tablefunc
Definition: parsenodes.h:1194
TableFuncType functype
Definition: primnodes.h:113

References Alias::aliasname, Assert, buildNSItemFromLists(), Alias::colnames, copyObject, ereport, errcode(), errmsg(), ERROR, exprLocation(), TableFunc::functype, InvalidOid, lappend(), 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, RangeTblEntry::tablefunc, and TFT_XMLTABLE.

Referenced by transformJsonTable(), and transformRangeTableFunc().

◆ addRangeTableEntryForValues()

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

Definition at line 2134 of file parse_relation.c.

2142 {
2144  char *refname = alias ? alias->aliasname : pstrdup("*VALUES*");
2145  Alias *eref;
2146  int numaliases;
2147  int numcolumns;
2148 
2149  Assert(pstate != NULL);
2150 
2151  rte->rtekind = RTE_VALUES;
2152  rte->relid = InvalidOid;
2153  rte->subquery = NULL;
2154  rte->values_lists = exprs;
2155  rte->coltypes = coltypes;
2156  rte->coltypmods = coltypmods;
2157  rte->colcollations = colcollations;
2158  rte->alias = alias;
2159 
2160  eref = alias ? copyObject(alias) : makeAlias(refname, NIL);
2161 
2162  /* fill in any unspecified alias columns */
2163  numcolumns = list_length((List *) linitial(exprs));
2164  numaliases = list_length(eref->colnames);
2165  while (numaliases < numcolumns)
2166  {
2167  char attrname[64];
2168 
2169  numaliases++;
2170  snprintf(attrname, sizeof(attrname), "column%d", numaliases);
2171  eref->colnames = lappend(eref->colnames,
2172  makeString(pstrdup(attrname)));
2173  }
2174  if (numcolumns < numaliases)
2175  ereport(ERROR,
2176  (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
2177  errmsg("VALUES lists \"%s\" have %d columns available but %d columns specified",
2178  refname, numcolumns, numaliases)));
2179 
2180  rte->eref = eref;
2181 
2182  /*
2183  * Set flags and access permissions.
2184  *
2185  * Subqueries are never checked for access rights, so no need to perform
2186  * addRTEPermissionInfo().
2187  */
2188  rte->lateral = lateral;
2189  rte->inFromCl = inFromCl;
2190 
2191  /*
2192  * Add completed RTE to pstate's range table list, so that we know its
2193  * index. But we don't add it to the join list --- caller must do that if
2194  * appropriate.
2195  */
2196  pstate->p_rtable = lappend(pstate->p_rtable, rte);
2197 
2198  /*
2199  * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
2200  * list --- caller must do that if appropriate.
2201  */
2202  return buildNSItemFromLists(rte, list_length(pstate->p_rtable),
2203  rte->coltypes, rte->coltypmods,
2204  rte->colcollations);
2205 }
@ RTE_VALUES
Definition: parsenodes.h:1033
#define snprintf
Definition: port.h:238
List * values_lists
Definition: parsenodes.h:1200

References Alias::aliasname, Assert, buildNSItemFromLists(), Alias::colnames, copyObject, ereport, errcode(), errmsg(), ERROR, InvalidOid, lappend(), 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 3865 of file parse_relation.c.

3866 {
3867  RTEPermissionInfo *perminfo;
3868 
3869  Assert(OidIsValid(rte->relid));
3870  Assert(rte->perminfoindex == 0);
3871 
3872  /* Nope, so make one and add to the list. */
3873  perminfo = makeNode(RTEPermissionInfo);
3874  perminfo->relid = rte->relid;
3875  perminfo->inh = rte->inh;
3876  /* Other information is set by fetching the node as and where needed. */
3877 
3878  *rteperminfos = lappend(*rteperminfos, perminfo);
3879 
3880  /* Note its index (1-based!) */
3881  rte->perminfoindex = list_length(*rteperminfos);
3882 
3883  return perminfo;
3884 }
#define OidIsValid(objectId)
Definition: c.h:775

References Assert, RangeTblEntry::inh, RTEPermissionInfo::inh, lappend(), list_length(), makeNode, OidIsValid, 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 3474 of file parse_relation.c.

3475 {
3476  int i;
3477 
3478  for (i = 0; i < RelationGetNumberOfAttributes(rd); i++)
3479  {
3481 
3482  if (namestrcmp(&(att->attname), attname) == 0 && !att->attisdropped)
3483  return i + 1;
3484  }
3485 
3486  if (sysColOK)
3487  {
3489  return i;
3490  }
3491 
3492  /* on failure */
3493  return InvalidAttrNumber;
3494 }
#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:511

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 3524 of file parse_relation.c.

3525 {
3526  if (attid <= 0)
3527  {
3528  const FormData_pg_attribute *sysatt;
3529 
3530  sysatt = SystemAttributeDefinition(attid);
3531  return &sysatt->attname;
3532  }
3533  if (attid > rd->rd_att->natts)
3534  elog(ERROR, "invalid attribute number %d", attid);
3535  return &TupleDescAttr(rd->rd_att, attid - 1)->attname;
3536 }
const FormData_pg_attribute * SystemAttributeDefinition(AttrNumber attno)
Definition: heap.c:240
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 3566 of file parse_relation.c.

3567 {
3568  if (attid <= 0)
3569  {
3570  /* All system attributes are of noncollatable types. */
3571  return InvalidOid;
3572  }
3573  if (attid > rd->rd_att->natts)
3574  elog(ERROR, "invalid attribute number %d", attid);
3575  return TupleDescAttr(rd->rd_att, attid - 1)->attcollation;
3576 }

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

◆ attnumTypeId()

Oid attnumTypeId ( Relation  rd,
int  attid 
)

Definition at line 3546 of file parse_relation.c.

3547 {
3548  if (attid <= 0)
3549  {
3550  const FormData_pg_attribute *sysatt;
3551 
3552  sysatt = SystemAttributeDefinition(attid);
3553  return sysatt->atttypid;
3554  }
3555  if (attid > rd->rd_att->natts)
3556  elog(ERROR, "invalid attribute number %d", attid);
3557  return TupleDescAttr(rd->rd_att, attid - 1)->atttypid;
3558 }

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_perminfo = NULL;
1396  nsitem->p_nscolumns = nscolumns;
1397  /* set default visibility flags; might get changed later */
1398  nsitem->p_rel_visible = true;
1399  nsitem->p_cols_visible = true;
1400  nsitem->p_lateral_only = false;
1401  nsitem->p_lateral_ok = true;
1402 
1403  return nsitem;
1404 }
void * palloc0(Size size)
Definition: mcxt.c:1346
#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:322
AttrNumber p_varattnosyn
Definition: parse_node.h:327

References Assert, 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_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(), 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, 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:746
#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:1205
int errhint(const char *fmt,...)
Definition: elog.c:1319
ParseNamespaceItem * p_target_nsitem
Definition: parse_node.h:208

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 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:192
bool p_lateral_active
Definition: parse_node.h:203

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 3656 of file parse_relation.c.

3658 {
3660 
3661  /*
3662  * Search the entire rtable looking for possible matches. If we find one,
3663  * emit a hint about it.
3664  */
3665  state = searchRangeTableForCol(pstate, relname, colname, location);
3666 
3667  /*
3668  * If there are exact match(es), they must be inaccessible for some
3669  * reason.
3670  */
3671  if (state->rexact1)
3672  {
3673  /*
3674  * We don't try too hard when there's multiple inaccessible exact
3675  * matches, but at least be sure that we don't misleadingly suggest
3676  * that there's only one.
3677  */
3678  if (state->rexact2)
3679  ereport(ERROR,
3680  (errcode(ERRCODE_UNDEFINED_COLUMN),
3681  relname ?
3682  errmsg("column %s.%s does not exist", relname, colname) :
3683  errmsg("column \"%s\" does not exist", colname),
3684  errdetail("There are columns named \"%s\", but they are in tables that cannot be referenced from this part of the query.",
3685  colname),
3686  !relname ? errhint("Try using a table-qualified name.") : 0,
3687  parser_errposition(pstate, location)));
3688  /* Single exact match, so try to determine why it's inaccessible. */
3689  ereport(ERROR,
3690  (errcode(ERRCODE_UNDEFINED_COLUMN),
3691  relname ?
3692  errmsg("column %s.%s does not exist", relname, colname) :
3693  errmsg("column \"%s\" does not exist", colname),
3694  errdetail("There is a column named \"%s\" in table \"%s\", but it cannot be referenced from this part of the query.",
3695  colname, state->rexact1->eref->aliasname),
3696  rte_visible_if_lateral(pstate, state->rexact1) ?
3697  errhint("To reference that column, you must mark this subquery with LATERAL.") :
3698  (!relname && rte_visible_if_qualified(pstate, state->rexact1)) ?
3699  errhint("To reference that column, you must use a table-qualified name.") : 0,
3700  parser_errposition(pstate, location)));
3701  }
3702 
3703  if (!state->rsecond)
3704  {
3705  /* If we found no match at all, we have little to report */
3706  if (!state->rfirst)
3707  ereport(ERROR,
3708  (errcode(ERRCODE_UNDEFINED_COLUMN),
3709  relname ?
3710  errmsg("column %s.%s does not exist", relname, colname) :
3711  errmsg("column \"%s\" does not exist", colname),
3712  parser_errposition(pstate, location)));
3713  /* Handle case where we have a single alternative spelling to offer */
3714  ereport(ERROR,
3715  (errcode(ERRCODE_UNDEFINED_COLUMN),
3716  relname ?
3717  errmsg("column %s.%s does not exist", relname, colname) :
3718  errmsg("column \"%s\" does not exist", colname),
3719  errhint("Perhaps you meant to reference the column \"%s.%s\".",
3720  state->rfirst->eref->aliasname,
3721  strVal(list_nth(state->rfirst->eref->colnames,
3722  state->first - 1))),
3723  parser_errposition(pstate, location)));
3724  }
3725  else
3726  {
3727  /* Handle case where there are two equally useful column hints */
3728  ereport(ERROR,
3729  (errcode(ERRCODE_UNDEFINED_COLUMN),
3730  relname ?
3731  errmsg("column %s.%s does not exist", relname, colname) :
3732  errmsg("column \"%s\" does not exist", colname),
3733  errhint("Perhaps you meant to reference the column \"%s.%s\" or the column \"%s.%s\".",
3734  state->rfirst->eref->aliasname,
3735  strVal(list_nth(state->rfirst->eref->colnames,
3736  state->first - 1)),
3737  state->rsecond->eref->aliasname,
3738  strVal(list_nth(state->rsecond->eref->colnames,
3739  state->second - 1))),
3740  parser_errposition(pstate, location)));
3741  }
3742 }
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 3585 of file parse_relation.c.

3586 {
3587  RangeTblEntry *rte;
3588  const char *badAlias = NULL;
3589 
3590  /*
3591  * Check to see if there are any potential matches in the query's
3592  * rangetable. (Note: cases involving a bad schema name in the RangeVar
3593  * will throw error immediately here. That seems OK.)
3594  */
3595  rte = searchRangeTableForRel(pstate, relation);
3596 
3597  /*
3598  * If we found a match that has an alias and the alias is visible in the
3599  * namespace, then the problem is probably use of the relation's real name
3600  * instead of its alias, ie "SELECT foo.* FROM foo f". This mistake is
3601  * common enough to justify a specific hint.
3602  *
3603  * If we found a match that doesn't meet those criteria, assume the
3604  * problem is illegal use of a relation outside its scope, as in the
3605  * MySQL-ism "SELECT ... FROM a, b LEFT JOIN c ON (a.x = c.y)".
3606  */
3607  if (rte && rte->alias &&
3608  strcmp(rte->eref->aliasname, relation->relname) != 0)
3609  {
3610  ParseNamespaceItem *nsitem;
3611  int sublevels_up;
3612 
3613  nsitem = refnameNamespaceItem(pstate, NULL, rte->eref->aliasname,
3614  relation->location,
3615  &sublevels_up);
3616  if (nsitem && nsitem->p_rte == rte)
3617  badAlias = rte->eref->aliasname;
3618  }
3619 
3620  /* If it looks like the user forgot to use an alias, hint about that */
3621  if (badAlias)
3622  ereport(ERROR,
3624  errmsg("invalid reference to FROM-clause entry for table \"%s\"",
3625  relation->relname),
3626  errhint("Perhaps you meant to reference the table alias \"%s\".",
3627  badAlias),
3628  parser_errposition(pstate, relation->location)));
3629  /* Hint about case where we found an (inaccessible) exact match */
3630  else if (rte)
3631  ereport(ERROR,
3633  errmsg("invalid reference to FROM-clause entry for table \"%s\"",
3634  relation->relname),
3635  errdetail("There is an entry for table \"%s\", but it cannot be referenced from this part of the query.",
3636  rte->eref->aliasname),
3637  rte_visible_if_lateral(pstate, rte) ?
3638  errhint("To reference that table, you must mark this subquery with LATERAL.") : 0,
3639  parser_errposition(pstate, relation->location)));
3640  /* Else, we have nothing to offer but the bald statement of error */
3641  else
3642  ereport(ERROR,
3644  errmsg("missing FROM-clause entry for table \"%s\"",
3645  relation->relname),
3646  parser_errposition(pstate, relation->location)));
3647 }
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 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 3182 of file parse_relation.c.

3184 {
3185  RangeTblEntry *rte = nsitem->p_rte;
3186  RTEPermissionInfo *perminfo = nsitem->p_perminfo;
3187  List *names,
3188  *vars;
3189  ListCell *name,
3190  *var;
3191  List *te_list = NIL;
3192 
3193  vars = expandNSItemVars(pstate, nsitem, sublevels_up, location, &names);
3194 
3195  /*
3196  * Require read access to the table. This is normally redundant with the
3197  * markVarForSelectPriv calls below, but not if the table has zero
3198  * columns. We need not do anything if the nsitem is for a join: its
3199  * component tables will have been marked ACL_SELECT when they were added
3200  * to the rangetable. (This step changes things only for the target
3201  * relation of UPDATE/DELETE, which cannot be under a join.)
3202  */
3203  if (rte->rtekind == RTE_RELATION)
3204  {
3205  Assert(perminfo != NULL);
3206  perminfo->requiredPerms |= ACL_SELECT;
3207  }
3208 
3209  forboth(name, names, var, vars)
3210  {
3211  char *label = strVal(lfirst(name));
3212  Var *varnode = (Var *) lfirst(var);
3213  TargetEntry *te;
3214 
3215  te = makeTargetEntry((Expr *) varnode,
3216  (AttrNumber) pstate->p_next_resno++,
3217  label,
3218  false);
3219  te_list = lappend(te_list, te);
3220 
3221  if (require_col_privs)
3222  {
3223  /* Require read access to each column */
3224  markVarForSelectPriv(pstate, varnode);
3225  }
3226  }
3227 
3228  Assert(name == NULL && var == NULL); /* lists not the same length? */
3229 
3230  return te_list;
3231 }
TargetEntry * makeTargetEntry(Expr *expr, AttrNumber resno, char *resname, bool resjunk)
Definition: makefuncs.c:240
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:518
int p_next_resno
Definition: parse_node.h:212
Definition: primnodes.h:248
Definition: regcomp.c:281
const char * name

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 3118 of file parse_relation.c.

3121 {
3122  List *result = NIL;
3123  int colindex;
3124  ListCell *lc;
3125 
3126  if (colnames)
3127  *colnames = NIL;
3128  colindex = 0;
3129  foreach(lc, nsitem->p_names->colnames)
3130  {
3131  String *colnameval = lfirst(lc);
3132  const char *colname = strVal(colnameval);
3133  ParseNamespaceColumn *nscol = nsitem->p_nscolumns + colindex;
3134 
3135  if (nscol->p_dontexpand)
3136  {
3137  /* skip */
3138  }
3139  else if (colname[0])
3140  {
3141  Var *var;
3142 
3143  Assert(nscol->p_varno > 0);
3144  var = makeVar(nscol->p_varno,
3145  nscol->p_varattno,
3146  nscol->p_vartype,
3147  nscol->p_vartypmod,
3148  nscol->p_varcollid,
3149  sublevels_up);
3150  /* makeVar doesn't offer parameters for these, so set by hand: */
3151  var->varnosyn = nscol->p_varnosyn;
3152  var->varattnosyn = nscol->p_varattnosyn;
3153  var->location = location;
3154 
3155  /* ... and update varnullingrels */
3156  markNullableIfNeeded(pstate, var);
3157 
3158  result = lappend(result, var);
3159  if (colnames)
3160  *colnames = lappend(*colnames, colnameval);
3161  }
3162  else
3163  {
3164  /* dropped column, ignore */
3165  Assert(nscol->p_varno == 0);
3166  }
3167  colindex++;
3168  }
3169  return result;
3170 }
Var * makeVar(int varno, AttrNumber varattno, Oid vartype, int32 vartypmod, Oid varcollid, Index varlevelsup)
Definition: makefuncs.c:66
void markNullableIfNeeded(ParseState *pstate, Var *var)
ParseLoc location
Definition: primnodes.h:293

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 3012 of file parse_relation.c.

3015 {
3016  Relation rel;
3017 
3018  /* Get the tupledesc and turn it over to expandTupleDesc */
3019  rel = relation_open(relid, AccessShareLock);
3020  expandTupleDesc(rel->rd_att, eref, rel->rd_att->natts, 0,
3021  rtindex, sublevels_up,
3022  location, include_dropped,
3023  colnames, colvars);
3025 }
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:205
Relation relation_open(Oid relationId, LOCKMODE lockmode)
Definition: relation.c:47

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 2659 of file parse_relation.c.

2662 {
2663  int varattno;
2664 
2665  if (colnames)
2666  *colnames = NIL;
2667  if (colvars)
2668  *colvars = NIL;
2669 
2670  switch (rte->rtekind)
2671  {
2672  case RTE_RELATION:
2673  /* Ordinary relation RTE */
2674  expandRelation(rte->relid, rte->eref,
2675  rtindex, sublevels_up, location,
2676  include_dropped, colnames, colvars);
2677  break;
2678  case RTE_SUBQUERY:
2679  {
2680  /* Subquery RTE */
2681  ListCell *aliasp_item = list_head(rte->eref->colnames);
2682  ListCell *tlistitem;
2683 
2684  varattno = 0;
2685  foreach(tlistitem, rte->subquery->targetList)
2686  {
2687  TargetEntry *te = (TargetEntry *) lfirst(tlistitem);
2688 
2689  if (te->resjunk)
2690  continue;
2691  varattno++;
2692  Assert(varattno == te->resno);
2693 
2694  /*
2695  * Formerly it was possible for the subquery tlist to have
2696  * more non-junk entries than the colnames list does (if
2697  * this RTE has been expanded from a view that has more
2698  * columns than it did when the current query was parsed).
2699  * Now that ApplyRetrieveRule cleans up such cases, we
2700  * shouldn't see that anymore, but let's just check.
2701  */
2702  if (!aliasp_item)
2703  elog(ERROR, "too few column names for subquery %s",
2704  rte->eref->aliasname);
2705 
2706  if (colnames)
2707  {
2708  char *label = strVal(lfirst(aliasp_item));
2709 
2710  *colnames = lappend(*colnames, makeString(pstrdup(label)));
2711  }
2712 
2713  if (colvars)
2714  {
2715  Var *varnode;
2716 
2717  varnode = makeVar(rtindex, varattno,
2718  exprType((Node *) te->expr),
2719  exprTypmod((Node *) te->expr),
2720  exprCollation((Node *) te->expr),
2721  sublevels_up);
2722  varnode->location = location;
2723 
2724  *colvars = lappend(*colvars, varnode);
2725  }
2726 
2727  aliasp_item = lnext(rte->eref->colnames, aliasp_item);
2728  }
2729  }
2730  break;
2731  case RTE_FUNCTION:
2732  {
2733  /* Function RTE */
2734  int atts_done = 0;
2735  ListCell *lc;
2736 
2737  foreach(lc, rte->functions)
2738  {
2739  RangeTblFunction *rtfunc = (RangeTblFunction *) lfirst(lc);
2740  TypeFuncClass functypclass;
2741  Oid funcrettype;
2742  TupleDesc tupdesc;
2743 
2744  functypclass = get_expr_result_type(rtfunc->funcexpr,
2745  &funcrettype,
2746  &tupdesc);
2747  if (functypclass == TYPEFUNC_COMPOSITE ||
2748  functypclass == TYPEFUNC_COMPOSITE_DOMAIN)
2749  {
2750  /* Composite data type, e.g. a table's row type */
2751  Assert(tupdesc);
2752  expandTupleDesc(tupdesc, rte->eref,
2753  rtfunc->funccolcount, atts_done,
2754  rtindex, sublevels_up, location,
2755  include_dropped, colnames, colvars);
2756  }
2757  else if (functypclass == TYPEFUNC_SCALAR)
2758  {
2759  /* Base data type, i.e. scalar */
2760  if (colnames)
2761  *colnames = lappend(*colnames,
2762  list_nth(rte->eref->colnames,
2763  atts_done));
2764 
2765  if (colvars)
2766  {
2767  Var *varnode;
2768 
2769  varnode = makeVar(rtindex, atts_done + 1,
2770  funcrettype,
2771  exprTypmod(rtfunc->funcexpr),
2772  exprCollation(rtfunc->funcexpr),
2773  sublevels_up);
2774  varnode->location = location;
2775 
2776  *colvars = lappend(*colvars, varnode);
2777  }
2778  }
2779  else if (functypclass == TYPEFUNC_RECORD)
2780  {
2781  if (colnames)
2782  {
2783  List *namelist;
2784 
2785  /* extract appropriate subset of column list */
2786  namelist = list_copy_tail(rte->eref->colnames,
2787  atts_done);
2788  namelist = list_truncate(namelist,
2789  rtfunc->funccolcount);
2790  *colnames = list_concat(*colnames, namelist);
2791  }
2792 
2793  if (colvars)
2794  {
2795  ListCell *l1;
2796  ListCell *l2;
2797  ListCell *l3;
2798  int attnum = atts_done;
2799 
2800  forthree(l1, rtfunc->funccoltypes,
2801  l2, rtfunc->funccoltypmods,
2802  l3, rtfunc->funccolcollations)
2803  {
2804  Oid attrtype = lfirst_oid(l1);
2805  int32 attrtypmod = lfirst_int(l2);
2806  Oid attrcollation = lfirst_oid(l3);
2807  Var *varnode;
2808 
2809  attnum++;
2810  varnode = makeVar(rtindex,
2811  attnum,
2812  attrtype,
2813  attrtypmod,
2814  attrcollation,
2815  sublevels_up);
2816  varnode->location = location;
2817  *colvars = lappend(*colvars, varnode);
2818  }
2819  }
2820  }
2821  else
2822  {
2823  /* addRangeTableEntryForFunction should've caught this */
2824  elog(ERROR, "function in FROM has unsupported return type");
2825  }
2826  atts_done += rtfunc->funccolcount;
2827  }
2828 
2829  /* Append the ordinality column if any */
2830  if (rte->funcordinality)
2831  {
2832  if (colnames)
2833  *colnames = lappend(*colnames,
2834  llast(rte->eref->colnames));
2835 
2836  if (colvars)
2837  {
2838  Var *varnode = makeVar(rtindex,
2839  atts_done + 1,
2840  INT8OID,
2841  -1,
2842  InvalidOid,
2843  sublevels_up);
2844 
2845  *colvars = lappend(*colvars, varnode);
2846  }
2847  }
2848  }
2849  break;
2850  case RTE_JOIN:
2851  {
2852  /* Join RTE */
2853  ListCell *colname;
2854  ListCell *aliasvar;
2855 
2856  Assert(list_length(rte->eref->colnames) == list_length(rte->joinaliasvars));
2857 
2858  varattno = 0;
2859  forboth(colname, rte->eref->colnames, aliasvar, rte->joinaliasvars)
2860  {
2861  Node *avar = (Node *) lfirst(aliasvar);
2862 
2863  varattno++;
2864 
2865  /*
2866  * During ordinary parsing, there will never be any
2867  * deleted columns in the join. While this function is
2868  * also used by the rewriter and planner, they do not
2869  * currently call it on any JOIN RTEs. Therefore, this
2870  * next bit is dead code, but it seems prudent to handle
2871  * the case correctly anyway.
2872  */
2873  if (avar == NULL)
2874  {
2875  if (include_dropped)
2876  {
2877  if (colnames)
2878  *colnames = lappend(*colnames,
2879  makeString(pstrdup("")));
2880  if (colvars)
2881  {
2882  /*
2883  * Can't use join's column type here (it might
2884  * be dropped!); but it doesn't really matter
2885  * what type the Const claims to be.
2886  */
2887  *colvars = lappend(*colvars,
2888  makeNullConst(INT4OID, -1,
2889  InvalidOid));
2890  }
2891  }
2892  continue;
2893  }
2894 
2895  if (colnames)
2896  {
2897  char *label = strVal(lfirst(colname));
2898 
2899  *colnames = lappend(*colnames,
2901  }
2902 
2903  if (colvars)
2904  {
2905  Var *varnode;
2906 
2907  /*
2908  * If the joinaliasvars entry is a simple Var, just
2909  * copy it (with adjustment of varlevelsup and
2910  * location); otherwise it is a JOIN USING column and
2911  * we must generate a join alias Var. This matches
2912  * the results that expansion of "join.*" by
2913  * expandNSItemVars would have produced, if we had
2914  * access to the ParseNamespaceItem for the join.
2915  */
2916  if (IsA(avar, Var))
2917  {
2918  varnode = copyObject((Var *) avar);
2919  varnode->varlevelsup = sublevels_up;
2920  }
2921  else
2922  varnode = makeVar(rtindex, varattno,
2923  exprType(avar),
2924  exprTypmod(avar),
2925  exprCollation(avar),
2926  sublevels_up);
2927  varnode->location = location;
2928 
2929  *colvars = lappend(*colvars, varnode);
2930  }
2931  }
2932  }
2933  break;
2934  case RTE_TABLEFUNC:
2935  case RTE_VALUES:
2936  case RTE_CTE:
2937  case RTE_NAMEDTUPLESTORE:
2938  {
2939  /* Tablefunc, Values, CTE, or ENR RTE */
2940  ListCell *aliasp_item = list_head(rte->eref->colnames);
2941  ListCell *lct;
2942  ListCell *lcm;
2943  ListCell *lcc;
2944 
2945  varattno = 0;
2946  forthree(lct, rte->coltypes,
2947  lcm, rte->coltypmods,
2948  lcc, rte->colcollations)
2949  {
2950  Oid coltype = lfirst_oid(lct);
2951  int32 coltypmod = lfirst_int(lcm);
2952  Oid colcoll = lfirst_oid(lcc);
2953 
2954  varattno++;
2955 
2956  if (colnames)
2957  {
2958  /* Assume there is one alias per output column */
2959  if (OidIsValid(coltype))
2960  {
2961  char *label = strVal(lfirst(aliasp_item));
2962 
2963  *colnames = lappend(*colnames,
2965  }
2966  else if (include_dropped)
2967  *colnames = lappend(*colnames,
2968  makeString(pstrdup("")));
2969 
2970  aliasp_item = lnext(rte->eref->colnames, aliasp_item);
2971  }
2972 
2973  if (colvars)
2974  {
2975  if (OidIsValid(coltype))
2976  {
2977  Var *varnode;
2978 
2979  varnode = makeVar(rtindex, varattno,
2980  coltype, coltypmod, colcoll,
2981  sublevels_up);
2982  varnode->location = location;
2983 
2984  *colvars = lappend(*colvars, varnode);
2985  }
2986  else if (include_dropped)
2987  {
2988  /*
2989  * It doesn't really matter what type the Const
2990  * claims to be.
2991  */
2992  *colvars = lappend(*colvars,
2993  makeNullConst(INT4OID, -1,
2994  InvalidOid));
2995  }
2996  }
2997  }
2998  }
2999  break;
3000  case RTE_RESULT:
3001  /* These expose no columns, so nothing to do */
3002  break;
3003  default:
3004  elog(ERROR, "unrecognized RTE kind: %d", (int) rte->rtekind);
3005  }
3006 }
List * list_truncate(List *list, int new_size)
Definition: list.c:631
Const * makeNullConst(Oid consttype, int32 consttypmod, Oid constcollid)
Definition: makefuncs.c:339
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:1036
int16 attnum
Definition: pg_attribute.h:74
#define llast(l)
Definition: pg_list.h:198
Index varlevelsup
Definition: primnodes.h:280

References Assert, attnum, copyObject, elog, ERROR, expandRelation(), expandTupleDesc(), TargetEntry::expr, exprCollation(), exprType(), exprTypmod(), forboth, forthree, RangeTblFunction::funcexpr, RangeTblEntry::funcordinality, RangeTblEntry::functions, get_expr_result_type(), InvalidOid, IsA, 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 3037 of file parse_relation.c.

3041 {
3042  ListCell *aliascell;
3043  int varattno;
3044 
3045  aliascell = (offset < list_length(eref->colnames)) ?
3046  list_nth_cell(eref->colnames, offset) : NULL;
3047 
3048  Assert(count <= tupdesc->natts);
3049  for (varattno = 0; varattno < count; varattno++)
3050  {
3051  Form_pg_attribute attr = TupleDescAttr(tupdesc, varattno);
3052 
3053  if (attr->attisdropped)
3054  {
3055  if (include_dropped)
3056  {
3057  if (colnames)
3058  *colnames = lappend(*colnames, makeString(pstrdup("")));
3059  if (colvars)
3060  {
3061  /*
3062  * can't use atttypid here, but it doesn't really matter
3063  * what type the Const claims to be.
3064  */
3065  *colvars = lappend(*colvars,
3066  makeNullConst(INT4OID, -1, InvalidOid));
3067  }
3068  }
3069  if (aliascell)
3070  aliascell = lnext(eref->colnames, aliascell);
3071  continue;
3072  }
3073 
3074  if (colnames)
3075  {
3076  char *label;
3077 
3078  if (aliascell)
3079  {
3080  label = strVal(lfirst(aliascell));
3081  aliascell = lnext(eref->colnames, aliascell);
3082  }
3083  else
3084  {
3085  /* If we run out of aliases, use the underlying name */
3086  label = NameStr(attr->attname);
3087  }
3088  *colnames = lappend(*colnames, makeString(pstrdup(label)));
3089  }
3090 
3091  if (colvars)
3092  {
3093  Var *varnode;
3094 
3095  varnode = makeVar(rtindex, varattno + offset + 1,
3096  attr->atttypid, attr->atttypmod,
3097  attr->attcollation,
3098  sublevels_up);
3099  varnode->location = location;
3100 
3101  *colvars = lappend(*colvars, varnode);
3102  }
3103  }
3104 }
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 3749 of file parse_relation.c.

3750 {
3751  while (pstate != NULL)
3752  {
3753  ListCell *l;
3754 
3755  foreach(l, pstate->p_namespace)
3756  {
3757  ParseNamespaceItem *nsitem = (ParseNamespaceItem *) lfirst(l);
3758 
3759  if (nsitem->p_rte == rte)
3760  return nsitem;
3761  }
3762  pstate = pstate->parentParseState;
3763  }
3764  return NULL;
3765 }

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 3450 of file parse_relation.c.

3451 {
3452  ListCell *l;
3453 
3454  foreach(l, qry->rowMarks)
3455  {
3456  RowMarkClause *rc = (RowMarkClause *) lfirst(l);
3457 
3458  if (rc->rti == rtindex)
3459  return rc;
3460  }
3461  return NULL;
3462 }
List * rowMarks
Definition: parsenodes.h:217

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 3286 of file parse_relation.c.

3287 {
3288  bool result;
3289 
3290  switch (rte->rtekind)
3291  {
3292  case RTE_RELATION:
3293  {
3294  /*
3295  * Plain relation RTE --- get the attribute's catalog entry
3296  */
3297  HeapTuple tp;
3298  Form_pg_attribute att_tup;
3299 
3300  tp = SearchSysCache2(ATTNUM,
3301  ObjectIdGetDatum(rte->relid),
3303  if (!HeapTupleIsValid(tp)) /* shouldn't happen */
3304  elog(ERROR, "cache lookup failed for attribute %d of relation %u",
3305  attnum, rte->relid);
3306  att_tup = (Form_pg_attribute) GETSTRUCT(tp);
3307  result = att_tup->attisdropped;
3308  ReleaseSysCache(tp);
3309  }
3310  break;
3311  case RTE_SUBQUERY:
3312  case RTE_TABLEFUNC:
3313  case RTE_VALUES:
3314  case RTE_CTE:
3315 
3316  /*
3317  * Subselect, Table Functions, Values, CTE RTEs never have dropped
3318  * columns
3319  */
3320  result = false;
3321  break;
3322  case RTE_NAMEDTUPLESTORE:
3323  {
3324  /* Check dropped-ness by testing for valid coltype */
3325  if (attnum <= 0 ||
3326  attnum > list_length(rte->coltypes))
3327  elog(ERROR, "invalid varattno %d", attnum);
3328  result = !OidIsValid((list_nth_oid(rte->coltypes, attnum - 1)));
3329  }
3330  break;
3331  case RTE_JOIN:
3332  {
3333  /*
3334  * A join RTE would not have dropped columns when constructed,
3335  * but one in a stored rule might contain columns that were
3336  * dropped from the underlying tables, if said columns are
3337  * nowhere explicitly referenced in the rule. This will be
3338  * signaled to us by a null pointer in the joinaliasvars list.
3339  */
3340  Var *aliasvar;
3341 
3342  if (attnum <= 0 ||
3343  attnum > list_length(rte->joinaliasvars))
3344  elog(ERROR, "invalid varattno %d", attnum);
3345  aliasvar = (Var *) list_nth(rte->joinaliasvars, attnum - 1);
3346 
3347  result = (aliasvar == NULL);
3348  }
3349  break;
3350  case RTE_FUNCTION:
3351  {
3352  /* Function RTE */
3353  ListCell *lc;
3354  int atts_done = 0;
3355 
3356  /*
3357  * Dropped attributes are only possible with functions that
3358  * return named composite types. In such a case we have to
3359  * look up the result type to see if it currently has this
3360  * column dropped. So first, loop over the funcs until we
3361  * find the one that covers the requested column.
3362  */
3363  foreach(lc, rte->functions)
3364  {
3365  RangeTblFunction *rtfunc = (RangeTblFunction *) lfirst(lc);
3366 
3367  if (attnum > atts_done &&
3368  attnum <= atts_done + rtfunc->funccolcount)
3369  {
3370  TupleDesc tupdesc;
3371 
3372  tupdesc = get_expr_result_tupdesc(rtfunc->funcexpr,
3373  true);
3374  if (tupdesc)
3375  {
3376  /* Composite data type, e.g. a table's row type */
3377  Form_pg_attribute att_tup;
3378 
3379  Assert(tupdesc);
3380  Assert(attnum - atts_done <= tupdesc->natts);
3381  att_tup = TupleDescAttr(tupdesc,
3382  attnum - atts_done - 1);
3383  return att_tup->attisdropped;
3384  }
3385  /* Otherwise, it can't have any dropped columns */
3386  return false;
3387  }
3388  atts_done += rtfunc->funccolcount;
3389  }
3390 
3391  /* If we get here, must be looking for the ordinality column */
3392  if (rte->funcordinality && attnum == atts_done + 1)
3393  return false;
3394 
3395  /* this probably can't happen ... */
3396  ereport(ERROR,
3397  (errcode(ERRCODE_UNDEFINED_COLUMN),
3398  errmsg("column %d of relation \"%s\" does not exist",
3399  attnum,
3400  rte->eref->aliasname)));
3401  result = false; /* keep compiler quiet */
3402  }
3403  break;
3404  case RTE_RESULT:
3405  /* this probably can't happen ... */
3406  ereport(ERROR,
3407  (errcode(ERRCODE_UNDEFINED_COLUMN),
3408  errmsg("column %d of relation \"%s\" does not exist",
3409  attnum,
3410  rte->eref->aliasname)));
3411  result = false; /* keep compiler quiet */
3412  break;
3413  default:
3414  elog(ERROR, "unrecognized RTE kind: %d", (int) rte->rtekind);
3415  result = false; /* keep compiler quiet */
3416  }
3417 
3418  return result;
3419 }
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:266
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:229

References Assert, attnum, elog, ereport, errcode(), errmsg(), ERROR, RangeTblFunction::funcexpr, RangeTblEntry::funcordinality, RangeTblEntry::functions, get_expr_result_tupdesc(), GETSTRUCT, HeapTupleIsValid, Int16GetDatum(), 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 3248 of file parse_relation.c.

3249 {
3250  if (attnum == InvalidAttrNumber)
3251  return "*";
3252 
3253  /*
3254  * If there is a user-written column alias, use it.
3255  */
3256  if (rte->alias &&
3257  attnum > 0 && attnum <= list_length(rte->alias->colnames))
3258  return strVal(list_nth(rte->alias->colnames, attnum - 1));
3259 
3260  /*
3261  * If the RTE is a relation, go to the system catalogs not the
3262  * eref->colnames list. This is a little slower but it will give the
3263  * right answer if the column has been renamed since the eref list was
3264  * built (which can easily happen for rules).
3265  */
3266  if (rte->rtekind == RTE_RELATION)
3267  return get_attname(rte->relid, attnum, false);
3268 
3269  /*
3270  * Otherwise use the column name from eref. There should always be one.
3271  */
3272  if (attnum > 0 && attnum <= list_length(rte->eref->colnames))
3273  return strVal(list_nth(rte->eref->colnames, attnum - 1));
3274 
3275  /* else caller gave us a bogus attnum */
3276  elog(ERROR, "invalid attnum %d for rangetable entry %s",
3277  attnum, rte->eref->aliasname);
3278  return NULL; /* keep compiler quiet */
3279 }
char * get_attname(Oid relid, AttrNumber attnum, bool missing_ok)
Definition: lsyscache.c:827

References attnum, elog, 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:614
List * p_ctenamespace
Definition: parse_node.h:204

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 3894 of file parse_relation.c.

3895 {
3896  RTEPermissionInfo *perminfo;
3897 
3898  if (rte->perminfoindex == 0 ||
3899  rte->perminfoindex > list_length(rteperminfos))
3900  elog(ERROR, "invalid perminfoindex %u in RTE with relid %u",
3901  rte->perminfoindex, rte->relid);
3902  perminfo = list_nth_node(RTEPermissionInfo, rteperminfos,
3903  rte->perminfoindex - 1);
3904  if (perminfo->relid != rte->relid)
3905  elog(ERROR, "permission info at index %u (with relid=%u) does not match provided RTE (with relid=%u)",
3906  rte->perminfoindex, perminfo->relid, rte->relid);
3907 
3908  return perminfo;
3909 }
#define list_nth_node(type, list, n)
Definition: pg_list.h:327

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

Referenced by add_rte_to_flat_rtable(), build_simple_rel(), examine_simple_variable(), 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:205

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 2575 of file parse_relation.c.

2576 {
2577  ListCell *l;
2578 
2579  /*
2580  * If we are in a subquery specified as locked FOR UPDATE/SHARE from
2581  * parent level, then act as though there's a generic FOR UPDATE here.
2582  */
2583  if (pstate->p_locked_from_parent)
2584  return true;
2585 
2586  foreach(l, pstate->p_locking_clause)
2587  {
2588  LockingClause *lc = (LockingClause *) lfirst(l);
2589 
2590  if (lc->lockedRels == NIL)
2591  {
2592  /* all tables used in query */
2593  return true;
2594  }
2595  else if (refname != NULL)
2596  {
2597  /* just the named tables */
2598  ListCell *l2;
2599 
2600  foreach(l2, lc->lockedRels)
2601  {
2602  RangeVar *thisrel = (RangeVar *) lfirst(l2);
2603 
2604  if (strcmp(refname, thisrel->relname) == 0)
2605  return true;
2606  }
2607  }
2608  }
2609  return false;
2610 }
List * lockedRels
Definition: parsenodes.h:834
bool p_locked_from_parent
Definition: parse_node.h:215
List * p_locking_clause
Definition: parse_node.h:214

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 3815 of file parse_relation.c.

3816 {
3817  return isQueryUsingTempRelation_walker((Node *) query, NULL);
3818 }
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 3821 of file parse_relation.c.

3822 {
3823  if (node == NULL)
3824  return false;
3825 
3826  if (IsA(node, Query))
3827  {
3828  Query *query = (Query *) node;
3829  ListCell *rtable;
3830 
3831  foreach(rtable, query->rtable)
3832  {
3833  RangeTblEntry *rte = lfirst(rtable);
3834 
3835  if (rte->rtekind == RTE_RELATION)
3836  {
3838  char relpersistence = rel->rd_rel->relpersistence;
3839 
3841  if (relpersistence == RELPERSISTENCE_TEMP)
3842  return true;
3843  }
3844  }
3845 
3846  return query_tree_walker(query,
3848  context,
3850  }
3851 
3852  return expression_tree_walker(node,
3854  context);
3855 }
#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
tree context
Definition: radixtree.h:1829
List * rtable
Definition: parsenodes.h:168
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:40

References AccessShareLock, context, 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:251
List * p_nullingrels
Definition: parse_node.h:198
int varno
Definition: primnodes.h:255

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:815
#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:197
Bitmapset * selectedCols
Definition: parsenodes.h:1297
#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:260

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 1418 of file parse_relation.c.

1419 {
1420  Relation rel;
1421  ParseCallbackState pcbstate;
1422 
1423  setup_parser_errposition_callback(&pcbstate, pstate, relation->location);
1424  rel = table_openrv_extended(relation, lockmode, true);
1425  if (rel == NULL)
1426  {
1427  if (relation->schemaname)
1428  ereport(ERROR,
1430  errmsg("relation \"%s.%s\" does not exist",
1431  relation->schemaname, relation->relname)));
1432  else
1433  {
1434  /*
1435  * An unqualified name might have been meant as a reference to
1436  * some not-yet-in-scope CTE. The bare "does not exist" message
1437  * has proven remarkably unhelpful for figuring out such problems,
1438  * so we take pains to offer a specific hint.
1439  */
1440  if (isFutureCTE(pstate, relation->relname))
1441  ereport(ERROR,
1443  errmsg("relation \"%s\" does not exist",
1444  relation->relname),
1445  errdetail("There is a WITH item named \"%s\", but it cannot be referenced from this part of the query.",
1446  relation->relname),
1447  errhint("Use WITH RECURSIVE, or re-order the WITH items to remove forward references.")));
1448  else
1449  ereport(ERROR,
1451  errmsg("relation \"%s\" does not exist",
1452  relation->relname)));
1453  }
1454  }
1456  return rel;
1457 }
void cancel_parser_errposition_callback(ParseCallbackState *pcbstate)
Definition: parse_node.c:156
void setup_parser_errposition_callback(ParseCallbackState *pcbstate, ParseState *pstate, int location)
Definition: parse_node.c:140
static bool isFutureCTE(ParseState *pstate, const char *refname)
char * schemaname
Definition: primnodes.h:79
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:1863
Oid LookupNamespaceNoError(const char *nspname)
Definition: namespace.c:3340
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 3777 of file parse_relation.c.

3778 {
3779  ParseNamespaceItem *nsitem;
3780 
3781  /* If LATERAL *is* active, we're clearly barking up the wrong tree */
3782  if (pstate->p_lateral_active)
3783  return false;
3784  nsitem = findNSItemForRTE(pstate, rte);
3785  if (nsitem)
3786  {
3787  /* Found it, report whether it's LATERAL-only */
3788  return nsitem->p_lateral_only && nsitem->p_lateral_ok;
3789  }
3790  return false;
3791 }
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 3797 of file parse_relation.c.

3798 {
3799  ParseNamespaceItem *nsitem = findNSItemForRTE(pstate, rte);
3800 
3801  if (nsitem)
3802  {
3803  /* Found it, report whether it's relation-only */
3804  return nsitem->p_rel_visible && !nsitem->p_cols_visible;
3805  }
3806  return false;
3807 }

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 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:83
@ EXPR_KIND_CHECK_CONSTRAINT
Definition: parse_node.h:68
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:211
#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 */
865  if (SearchSysCacheExists2(ATTNUM,
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:97

References attnum, Alias::colnames, ereport, errcode(), errmsg(), ERROR, Int16GetDatum(), InvalidAttrNumber, lfirst, ObjectIdGetDatum(), parser_errposition(), RangeTblEntry::relid, 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 attnum, FuzzyAttrMatchState::distance, 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:80
CommonTableExpr * scanNameSpaceForCTE(ParseState *pstate, const char *refname, Index *ctelevelsup)
bool scanNameSpaceForENR(ParseState *pstate, const char *refname)

References RangeTblEntry::ctelevelsup, RangeTblEntry::ctename, RangeTblEntry::enrname, 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 3505 of file parse_relation.c.

3506 {
3507  const FormData_pg_attribute *sysatt;
3508 
3509  sysatt = SystemAttributeByName(attname);
3510  if (sysatt != NULL)
3511  return sysatt->attnum;
3512  return InvalidAttrNumber;
3513 }
const FormData_pg_attribute * SystemAttributeByName(const char *attname)
Definition: heap.c:252

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().