parse_relation.h File Reference

#include "parser/parse_node.h"
#include "storage/lockdefs.h"

Include dependency graph for parse_relation.h:

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Go to the source code of this file.

Functions
ParseNamespaceItem *	refnameNamespaceItem (ParseState *pstate, const char *schemaname, const char *refname, int location, int *sublevels_up)
CommonTableExpr *	scanNameSpaceForCTE (ParseState *pstate, const char *refname, Index *ctelevelsup)
bool	scanNameSpaceForENR (ParseState *pstate, const char *refname)
void	checkNameSpaceConflicts (ParseState *pstate, List *namespace1, List *namespace2)
ParseNamespaceItem *	GetNSItemByRangeTablePosn (ParseState *pstate, int varno, int sublevels_up)
ParseNamespaceItem *	GetNSItemByVar (ParseState *pstate, Var *var)
RangeTblEntry *	GetRTEByRangeTablePosn (ParseState *pstate, int varno, int sublevels_up)
CommonTableExpr *	GetCTEForRTE (ParseState *pstate, RangeTblEntry *rte, int rtelevelsup)
Node *	scanNSItemForColumn (ParseState *pstate, ParseNamespaceItem *nsitem, int sublevels_up, const char *colname, int location)
Node *	colNameToVar (ParseState *pstate, const char *colname, bool localonly, int location)
void	markNullableIfNeeded (ParseState *pstate, Var *var)
void	markVarForSelectPriv (ParseState *pstate, Var *var)
Relation	parserOpenTable (ParseState *pstate, const RangeVar *relation, LOCKMODE lockmode)
ParseNamespaceItem *	addRangeTableEntry (ParseState *pstate, RangeVar *relation, Alias *alias, bool inh, bool inFromCl)
ParseNamespaceItem *	addRangeTableEntryForRelation (ParseState *pstate, Relation rel, LOCKMODE lockmode, Alias *alias, bool inh, bool inFromCl)
ParseNamespaceItem *	addRangeTableEntryForSubquery (ParseState *pstate, Query *subquery, Alias *alias, bool lateral, bool inFromCl)
ParseNamespaceItem *	addRangeTableEntryForFunction (ParseState *pstate, List *funcnames, List *funcexprs, List *coldeflists, RangeFunction *rangefunc, bool lateral, bool inFromCl)
ParseNamespaceItem *	addRangeTableEntryForValues (ParseState *pstate, List *exprs, List *coltypes, List *coltypmods, List *colcollations, Alias *alias, bool lateral, bool inFromCl)
ParseNamespaceItem *	addRangeTableEntryForTableFunc (ParseState *pstate, TableFunc *tf, Alias *alias, bool lateral, bool inFromCl)
ParseNamespaceItem *	addRangeTableEntryForGraphTable (ParseState *pstate, Oid graphid, GraphPattern *graph_pattern, List *columns, List *colnames, Alias *alias, bool lateral, bool inFromCl)
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)
ParseNamespaceItem *	addRangeTableEntryForCTE (ParseState *pstate, CommonTableExpr *cte, Index levelsup, RangeVar *rv, bool inFromCl)
ParseNamespaceItem *	addRangeTableEntryForENR (ParseState *pstate, RangeVar *rv, bool inFromCl)
ParseNamespaceItem *	addRangeTableEntryForGroup (ParseState *pstate, List *groupClauses)
RTEPermissionInfo *	addRTEPermissionInfo (List **rteperminfos, RangeTblEntry *rte)
RTEPermissionInfo *	getRTEPermissionInfo (List *rteperminfos, RangeTblEntry *rte)
bool	isLockedRefname (ParseState *pstate, const char *refname)
void	addNSItemToQuery (ParseState *pstate, ParseNamespaceItem *nsitem, bool addToJoinList, bool addToRelNameSpace, bool addToVarNameSpace)
pg_noreturn void	errorMissingRTE (ParseState *pstate, RangeVar *relation)
pg_noreturn void	errorMissingColumn (ParseState *pstate, const char *relname, const char *colname, int location)
void	expandRTE (RangeTblEntry *rte, int rtindex, int sublevels_up, VarReturningType returning_type, int location, bool include_dropped, List **colnames, List **colvars)
List *	expandNSItemVars (ParseState *pstate, ParseNamespaceItem *nsitem, int sublevels_up, int location, List **colnames)
List *	expandNSItemAttrs (ParseState *pstate, ParseNamespaceItem *nsitem, int sublevels_up, bool require_col_privs, int location)
int	attnameAttNum (Relation rd, const char *attname, bool sysColOK)
const NameData *	attnumAttName (Relation rd, int attid)
Oid	attnumTypeId (Relation rd, int attid)
Oid	attnumCollationId (Relation rd, int attid)

Function Documentation

addNSItemToQuery()

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

extern

Definition at line 2825 of file parse_relation.c.

{
    if (addToJoinList)
    {
        RangeTblRef *rtr = makeNode(RangeTblRef);
 
        rtr->rtindex = nsitem->p_rtindex;
        pstate->p_joinlist = lappend(pstate->p_joinlist, rtr);
    }
    if (addToRelNameSpace || addToVarNameSpace)
    {
        /* Set the new nsitem's visibility flags correctly */
        nsitem->p_rel_visible = addToRelNameSpace;
        nsitem->p_cols_visible = addToVarNameSpace;
        nsitem->p_lateral_only = false;
        nsitem->p_lateral_ok = true;
        pstate->p_namespace = lappend(pstate->p_namespace, nsitem);
    }
}

References fb(), lappend(), makeNode, ParseState::p_joinlist, and ParseState::p_namespace.

Referenced by addNSItemForReturning(), AddRelationNewConstraints(), AlterPolicy(), CreatePolicy(), CreateTriggerFiringOn(), DefineRelation(), DoCopy(), insert_property_records(), 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  )

extern

Definition at line 1511 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    RTEPermissionInfo *perminfo;
    char       *refname = alias ? alias->aliasname : relation->relname;
    LOCKMODE    lockmode;
    Relation    rel;
    ParseNamespaceItem *nsitem;
 
    Assert(pstate != NULL);
 
    rte->rtekind = RTE_RELATION;
    rte->alias = alias;
 
    /*
     * Identify the type of lock we'll need on this relation.  It's not the
     * query's target table (that case is handled elsewhere), so we need
     * either RowShareLock if it's locked by FOR UPDATE/SHARE, or plain
     * AccessShareLock otherwise.
     */
    lockmode = isLockedRefname(pstate, refname) ? RowShareLock : AccessShareLock;
 
    /*
     * Get the rel's OID.  This access also ensures that we have an up-to-date
     * relcache entry for the rel.  Since this is typically the first access
     * to a rel in a statement, we must open the rel with the proper lockmode.
     */
    rel = parserOpenTable(pstate, relation, lockmode);
    rte->relid = RelationGetRelid(rel);
    rte->inh = inh;
    rte->relkind = rel->rd_rel->relkind;
    rte->rellockmode = lockmode;
 
    /*
     * Build the list of effective column names using user-supplied aliases
     * and/or actual column names.
     */
    rte->eref = makeAlias(refname, NIL);
    buildRelationAliases(rel->rd_att, alias, rte->eref);
 
    /*
     * Set flags and initialize access permissions.
     *
     * The initial default on access checks is always check-for-READ-access,
     * which is the right thing for all except target tables.
     */
    rte->lateral = false;
    rte->inFromCl = inFromCl;
 
    perminfo = addRTEPermissionInfo(&pstate->p_rteperminfos, rte);
    perminfo->requiredPerms = ACL_SELECT;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    nsitem = buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable),
                                      perminfo, rel->rd_att);
 
    /*
     * Drop the rel refcount, but keep the access lock till end of transaction
     * so that the table can't be deleted or have its schema modified
     * underneath us.
     */
    table_close(rel, NoLock);
 
    return nsitem;
}

References AccessShareLock, ACL_SELECT, addRTEPermissionInfo(), Alias::aliasname, Assert, buildNSItemFromTupleDesc(), buildRelationAliases(), fb(), isLockedRefname(), lappend(), list_length(), makeAlias(), makeNode, NIL, NoLock, ParseState::p_rtable, ParseState::p_rteperminfos, parserOpenTable(), RelationData::rd_att, RelationData::rd_rel, RelationGetRelid, RangeVar::relname, RowShareLock, RTE_RELATION, and table_close().

Referenced by transformTableEntry().

addRangeTableEntryForCTE()

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

extern

Definition at line 2447 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    Alias      *alias = rv->alias;
    char       *refname = alias ? alias->aliasname : cte->ctename;
    Alias      *eref;
    int         numaliases;
    int         varattno;
    ListCell   *lc;
    int         n_dontexpand_columns = 0;
    ParseNamespaceItem *psi;
 
    Assert(pstate != NULL);
 
    rte->rtekind = RTE_CTE;
    rte->ctename = cte->ctename;
    rte->ctelevelsup = levelsup;
 
    /* Self-reference if and only if CTE's parse analysis isn't completed */
    rte->self_reference = !IsA(cte->ctequery, Query);
    Assert(cte->cterecursive || !rte->self_reference);
    /* Bump the CTE's refcount if this isn't a self-reference */
    if (!rte->self_reference)
        cte->cterefcount++;
 
    /*
     * We throw error if the CTE is INSERT/UPDATE/DELETE/MERGE without
     * RETURNING.  This won't get checked in case of a self-reference, but
     * that's OK because data-modifying CTEs aren't allowed to be recursive
     * anyhow.
     */
    if (IsA(cte->ctequery, Query))
    {
        Query      *ctequery = (Query *) cte->ctequery;
 
        if (ctequery->commandType != CMD_SELECT &&
            ctequery->returningList == NIL)
            ereport(ERROR,
                    (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                     errmsg("WITH query \"%s\" does not have a RETURNING clause",
                            cte->ctename),
                     parser_errposition(pstate, rv->location)));
    }
 
    rte->coltypes = list_copy(cte->ctecoltypes);
    rte->coltypmods = list_copy(cte->ctecoltypmods);
    rte->colcollations = list_copy(cte->ctecolcollations);
 
    rte->alias = alias;
    if (alias)
        eref = copyObject(alias);
    else
        eref = makeAlias(refname, NIL);
    numaliases = list_length(eref->colnames);
 
    /* fill in any unspecified alias columns */
    varattno = 0;
    foreach(lc, cte->ctecolnames)
    {
        varattno++;
        if (varattno > numaliases)
            eref->colnames = lappend(eref->colnames, lfirst(lc));
    }
    if (varattno < numaliases)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("table \"%s\" has %d columns available but %d columns specified",
                        refname, varattno, numaliases)));
 
    rte->eref = eref;
 
    if (cte->search_clause)
    {
        rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->search_clause->search_seq_column));
        if (cte->search_clause->search_breadth_first)
            rte->coltypes = lappend_oid(rte->coltypes, RECORDOID);
        else
            rte->coltypes = lappend_oid(rte->coltypes, RECORDARRAYOID);
        rte->coltypmods = lappend_int(rte->coltypmods, -1);
        rte->colcollations = lappend_oid(rte->colcollations, InvalidOid);
 
        n_dontexpand_columns += 1;
    }
 
    if (cte->cycle_clause)
    {
        rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->cycle_clause->cycle_mark_column));
        rte->coltypes = lappend_oid(rte->coltypes, cte->cycle_clause->cycle_mark_type);
        rte->coltypmods = lappend_int(rte->coltypmods, cte->cycle_clause->cycle_mark_typmod);
        rte->colcollations = lappend_oid(rte->colcollations, cte->cycle_clause->cycle_mark_collation);
 
        rte->eref->colnames = lappend(rte->eref->colnames, makeString(cte->cycle_clause->cycle_path_column));
        rte->coltypes = lappend_oid(rte->coltypes, RECORDARRAYOID);
        rte->coltypmods = lappend_int(rte->coltypmods, -1);
        rte->colcollations = lappend_oid(rte->colcollations, InvalidOid);
 
        n_dontexpand_columns += 2;
    }
 
    /*
     * Set flags and access permissions.
     *
     * Subqueries are never checked for access rights, so no need to perform
     * addRTEPermissionInfo().
     */
    rte->lateral = false;
    rte->inFromCl = inFromCl;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    psi = buildNSItemFromLists(rte, list_length(pstate->p_rtable),
                               rte->coltypes, rte->coltypmods,
                               rte->colcollations);
 
    /*
     * The columns added by search and cycle clauses are not included in star
     * expansion in queries contained in the CTE.
     */
    if (rte->ctelevelsup > 0)
        for (int i = 0; i < n_dontexpand_columns; i++)
            psi->p_nscolumns[list_length(psi->p_names->colnames) - 1 - i].p_dontexpand = true;
 
    return psi;
}

References RangeVar::alias, Alias::aliasname, Assert, buildNSItemFromLists(), CMD_SELECT, Query::commandType, copyObject, CommonTableExpr::ctename, CommonTableExpr::ctequery, ereport, errcode(), errmsg, ERROR, fb(), i, InvalidOid, IsA, lappend(), lappend_int(), lappend_oid(), lfirst, list_copy(), list_length(), RangeVar::location, makeAlias(), makeNode, makeString(), NIL, ParseState::p_rtable, parser_errposition(), Query::returningList, and RTE_CTE.

Referenced by getNSItemForSpecialRelationTypes().

addRangeTableEntryForENR()

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

extern

Definition at line 2599 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    Alias      *alias = rv->alias;
    char       *refname = alias ? alias->aliasname : rv->relname;
    EphemeralNamedRelationMetadata enrmd;
    TupleDesc   tupdesc;
    int         attno;
 
    Assert(pstate != NULL);
    enrmd = get_visible_ENR(pstate, rv->relname);
    Assert(enrmd != NULL);
 
    switch (enrmd->enrtype)
    {
        case ENR_NAMED_TUPLESTORE:
            rte->rtekind = RTE_NAMEDTUPLESTORE;
            break;
 
        default:
            elog(ERROR, "unexpected enrtype: %d", enrmd->enrtype);
            return NULL;        /* for fussy compilers */
    }
 
    /*
     * Record dependency on a relation.  This allows plans to be invalidated
     * if they access transition tables linked to a table that is altered.
     */
    rte->relid = enrmd->reliddesc;
 
    /*
     * Build the list of effective column names using user-supplied aliases
     * and/or actual column names.
     */
    tupdesc = ENRMetadataGetTupDesc(enrmd);
    rte->eref = makeAlias(refname, NIL);
    buildRelationAliases(tupdesc, alias, rte->eref);
 
    /* Record additional data for ENR, including column type info */
    rte->enrname = enrmd->name;
    rte->enrtuples = enrmd->enrtuples;
    rte->coltypes = NIL;
    rte->coltypmods = NIL;
    rte->colcollations = NIL;
    for (attno = 1; attno <= tupdesc->natts; ++attno)
    {
        Form_pg_attribute att = TupleDescAttr(tupdesc, attno - 1);
 
        if (att->attisdropped)
        {
            /* Record zeroes for a dropped column */
            rte->coltypes = lappend_oid(rte->coltypes, InvalidOid);
            rte->coltypmods = lappend_int(rte->coltypmods, 0);
            rte->colcollations = lappend_oid(rte->colcollations, InvalidOid);
        }
        else
        {
            /* Let's just make sure we can tell this isn't dropped */
            if (att->atttypid == InvalidOid)
                elog(ERROR, "atttypid is invalid for non-dropped column in \"%s\"",
                     rv->relname);
            rte->coltypes = lappend_oid(rte->coltypes, att->atttypid);
            rte->coltypmods = lappend_int(rte->coltypmods, att->atttypmod);
            rte->colcollations = lappend_oid(rte->colcollations,
                                             att->attcollation);
        }
    }
 
    /*
     * Set flags and access permissions.
     *
     * ENRs are never checked for access rights, so no need to perform
     * addRTEPermissionInfo().
     */
    rte->lateral = false;
    rte->inFromCl = inFromCl;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    return buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable), NULL,
                                    tupdesc);
}

References RangeVar::alias, Alias::aliasname, Assert, buildNSItemFromTupleDesc(), buildRelationAliases(), elog, ENR_NAMED_TUPLESTORE, ENRMetadataGetTupDesc(), ERROR, fb(), get_visible_ENR(), InvalidOid, lappend(), lappend_int(), lappend_oid(), list_length(), makeAlias(), makeNode, TupleDescData::natts, NIL, ParseState::p_rtable, RangeVar::relname, RTE_NAMEDTUPLESTORE, and TupleDescAttr().

Referenced by getNSItemForSpecialRelationTypes().

addRangeTableEntryForFunction()

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

extern

Definition at line 1771 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    Alias      *alias = rangefunc->alias;
    Alias      *eref;
    char       *aliasname;
    int         nfuncs = list_length(funcexprs);
    TupleDesc  *functupdescs;
    TupleDesc   tupdesc;
    ListCell   *lc1,
               *lc2,
               *lc3;
    int         i;
    int         j;
    int         funcno;
    int         natts,
                totalatts;
 
    Assert(pstate != NULL);
 
    rte->rtekind = RTE_FUNCTION;
    rte->relid = InvalidOid;
    rte->subquery = NULL;
    rte->functions = NIL;       /* we'll fill this list below */
    rte->funcordinality = rangefunc->ordinality;
    rte->alias = alias;
 
    /*
     * Choose the RTE alias name.  We default to using the first function's
     * name even when there's more than one; which is maybe arguable but beats
     * using something constant like "table".
     */
    if (alias)
        aliasname = alias->aliasname;
    else
        aliasname = linitial(funcnames);
 
    eref = makeAlias(aliasname, NIL);
    rte->eref = eref;
 
    /* Process each function ... */
    functupdescs = palloc_array(TupleDesc, nfuncs);
 
    totalatts = 0;
    funcno = 0;
    forthree(lc1, funcexprs, lc2, funcnames, lc3, coldeflists)
    {
        Node       *funcexpr = (Node *) lfirst(lc1);
        char       *funcname = (char *) lfirst(lc2);
        List       *coldeflist = (List *) lfirst(lc3);
        RangeTblFunction *rtfunc = makeNode(RangeTblFunction);
        TypeFuncClass functypclass;
        Oid         funcrettype;
 
        /* Initialize RangeTblFunction node */
        rtfunc->funcexpr = funcexpr;
        rtfunc->funccolnames = NIL;
        rtfunc->funccoltypes = NIL;
        rtfunc->funccoltypmods = NIL;
        rtfunc->funccolcollations = NIL;
        rtfunc->funcparams = NULL;  /* not set until planning */
 
        /*
         * Now determine if the function returns a simple or composite type.
         */
        functypclass = get_expr_result_type(funcexpr,
                                            &funcrettype,
                                            &tupdesc);
 
        /*
         * A coldeflist is required if the function returns RECORD and hasn't
         * got a predetermined record type, and is prohibited otherwise.  This
         * can be a bit confusing, so we expend some effort on delivering a
         * relevant error message.
         */
        if (coldeflist != NIL)
        {
            switch (functypclass)
            {
                case TYPEFUNC_RECORD:
                    /* ok */
                    break;
                case TYPEFUNC_COMPOSITE:
                case TYPEFUNC_COMPOSITE_DOMAIN:
 
                    /*
                     * If the function's raw result type is RECORD, we must
                     * have resolved it using its OUT parameters.  Otherwise,
                     * it must have a named composite type.
                     */
                    if (exprType(funcexpr) == RECORDOID)
                        ereport(ERROR,
                                (errcode(ERRCODE_SYNTAX_ERROR),
                                 errmsg("a column definition list is redundant for a function with OUT parameters"),
                                 parser_errposition(pstate,
                                                    exprLocation((Node *) coldeflist))));
                    else
                        ereport(ERROR,
                                (errcode(ERRCODE_SYNTAX_ERROR),
                                 errmsg("a column definition list is redundant for a function returning a named composite type"),
                                 parser_errposition(pstate,
                                                    exprLocation((Node *) coldeflist))));
                    break;
                default:
                    ereport(ERROR,
                            (errcode(ERRCODE_SYNTAX_ERROR),
                             errmsg("a column definition list is only allowed for functions returning \"record\""),
                             parser_errposition(pstate,
                                                exprLocation((Node *) coldeflist))));
                    break;
            }
        }
        else
        {
            if (functypclass == TYPEFUNC_RECORD)
                ereport(ERROR,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("a column definition list is required for functions returning \"record\""),
                         parser_errposition(pstate, exprLocation(funcexpr))));
        }
 
        if (functypclass == TYPEFUNC_COMPOSITE ||
            functypclass == TYPEFUNC_COMPOSITE_DOMAIN)
        {
            /* Composite data type, e.g. a table's row type */
            Assert(tupdesc);
        }
        else if (functypclass == TYPEFUNC_SCALAR)
        {
            /* Base data type, i.e. scalar */
            tupdesc = CreateTemplateTupleDesc(1);
            TupleDescInitEntry(tupdesc,
                               (AttrNumber) 1,
                               chooseScalarFunctionAlias(funcexpr, funcname,
                                                         alias, nfuncs),
                               funcrettype,
                               exprTypmod(funcexpr),
                               0);
            TupleDescInitEntryCollation(tupdesc,
                                        (AttrNumber) 1,
                                        exprCollation(funcexpr));
            TupleDescFinalize(tupdesc);
        }
        else if (functypclass == TYPEFUNC_RECORD)
        {
            ListCell   *col;
 
            /*
             * Use the column definition list to construct a tupdesc and fill
             * in the RangeTblFunction's lists.  Limit number of columns to
             * MaxHeapAttributeNumber, because CheckAttributeNamesTypes will.
             */
            if (list_length(coldeflist) > MaxHeapAttributeNumber)
                ereport(ERROR,
                        (errcode(ERRCODE_TOO_MANY_COLUMNS),
                         errmsg("column definition lists can have at most %d entries",
                                MaxHeapAttributeNumber),
                         parser_errposition(pstate,
                                            exprLocation((Node *) coldeflist))));
            tupdesc = CreateTemplateTupleDesc(list_length(coldeflist));
            i = 1;
            foreach(col, coldeflist)
            {
                ColumnDef  *n = (ColumnDef *) lfirst(col);
                char       *attrname;
                Oid         attrtype;
                int32       attrtypmod;
                Oid         attrcollation;
 
                attrname = n->colname;
                if (n->typeName->setof)
                    ereport(ERROR,
                            (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
                             errmsg("column \"%s\" cannot be declared SETOF",
                                    attrname),
                             parser_errposition(pstate, n->location)));
                typenameTypeIdAndMod(pstate, n->typeName,
                                     &attrtype, &attrtypmod);
                attrcollation = GetColumnDefCollation(pstate, n, attrtype);
                TupleDescInitEntry(tupdesc,
                                   (AttrNumber) i,
                                   attrname,
                                   attrtype,
                                   attrtypmod,
                                   0);
                TupleDescInitEntryCollation(tupdesc,
                                            (AttrNumber) i,
                                            attrcollation);
                rtfunc->funccolnames = lappend(rtfunc->funccolnames,
                                               makeString(pstrdup(attrname)));
                rtfunc->funccoltypes = lappend_oid(rtfunc->funccoltypes,
                                                   attrtype);
                rtfunc->funccoltypmods = lappend_int(rtfunc->funccoltypmods,
                                                     attrtypmod);
                rtfunc->funccolcollations = lappend_oid(rtfunc->funccolcollations,
                                                        attrcollation);
 
                i++;
            }
            TupleDescFinalize(tupdesc);
 
            /*
             * Ensure that the coldeflist defines a legal set of names (no
             * duplicates, but we needn't worry about system column names) and
             * datatypes.  Although we mostly can't allow pseudo-types, it
             * seems safe to allow RECORD and RECORD[], since values within
             * those type classes are self-identifying at runtime, and the
             * coldeflist doesn't represent anything that will be visible to
             * other sessions.
             */
            CheckAttributeNamesTypes(tupdesc, RELKIND_COMPOSITE_TYPE,
                                     CHKATYPE_ANYRECORD);
        }
        else
            ereport(ERROR,
                    (errcode(ERRCODE_DATATYPE_MISMATCH),
                     errmsg("function \"%s\" in FROM has unsupported return type %s",
                            funcname, format_type_be(funcrettype)),
                     parser_errposition(pstate, exprLocation(funcexpr))));
 
        /* Finish off the RangeTblFunction and add it to the RTE's list */
        rtfunc->funccolcount = tupdesc->natts;
        rte->functions = lappend(rte->functions, rtfunc);
 
        /* Save the tupdesc for use below */
        functupdescs[funcno] = tupdesc;
        totalatts += tupdesc->natts;
        funcno++;
    }
 
    /*
     * If there's more than one function, or we want an ordinality column, we
     * have to produce a merged tupdesc.
     */
    if (nfuncs > 1 || rangefunc->ordinality)
    {
        if (rangefunc->ordinality)
            totalatts++;
 
        /* Disallow more columns than will fit in a tuple */
        if (totalatts > MaxTupleAttributeNumber)
            ereport(ERROR,
                    (errcode(ERRCODE_TOO_MANY_COLUMNS),
                     errmsg("functions in FROM can return at most %d columns",
                            MaxTupleAttributeNumber),
                     parser_errposition(pstate,
                                        exprLocation((Node *) funcexprs))));
 
        /* Merge the tuple descs of each function into a composite one */
        tupdesc = CreateTemplateTupleDesc(totalatts);
        natts = 0;
        for (i = 0; i < nfuncs; i++)
        {
            for (j = 1; j <= functupdescs[i]->natts; j++)
                TupleDescCopyEntry(tupdesc, ++natts, functupdescs[i], j);
        }
 
        /* Add the ordinality column if needed */
        if (rangefunc->ordinality)
        {
            TupleDescInitEntry(tupdesc,
                               (AttrNumber) ++natts,
                               "ordinality",
                               INT8OID,
                               -1,
                               0);
            /* no need to set collation */
        }
        TupleDescFinalize(tupdesc);
        Assert(natts == totalatts);
    }
    else
    {
        /* We can just use the single function's tupdesc as-is */
        tupdesc = functupdescs[0];
    }
 
    /* Use the tupdesc while assigning column aliases for the RTE */
    buildRelationAliases(tupdesc, alias, eref);
 
    /*
     * Set flags and access permissions.
     *
     * Functions are never checked for access rights (at least, not by
     * ExecCheckPermissions()), so no need to perform addRTEPermissionInfo().
     */
    rte->lateral = lateral;
    rte->inFromCl = inFromCl;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    return buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable), NULL,
                                    tupdesc);
}

References Alias::aliasname, Assert, buildNSItemFromTupleDesc(), buildRelationAliases(), CheckAttributeNamesTypes(), CHKATYPE_ANYRECORD, chooseScalarFunctionAlias(), ColumnDef::colname, CreateTemplateTupleDesc(), ereport, errcode(), errmsg, ERROR, exprCollation(), exprLocation(), exprType(), exprTypmod(), fb(), format_type_be(), forthree, RangeTblFunction::funcexpr, funcname, 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, ParseState::p_rtable, palloc_array, parser_errposition(), pstrdup(), RTE_FUNCTION, TypeName::setof, TupleDescCopyEntry(), TupleDescFinalize(), TupleDescInitEntry(), TupleDescInitEntryCollation(), TYPEFUNC_COMPOSITE, TYPEFUNC_COMPOSITE_DOMAIN, TYPEFUNC_RECORD, TYPEFUNC_SCALAR, ColumnDef::typeName, and typenameTypeIdAndMod().

Referenced by transformRangeFunction().

addRangeTableEntryForGraphTable()

ParseNamespaceItem * addRangeTableEntryForGraphTable ( ParseState *  pstate, Oid  graphid, GraphPattern *  graph_pattern, List *  columns, List *  colnames, Alias *  alias, bool  lateral, bool  inFromCl  )

extern

Definition at line 2167 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    char       *refname = alias ? alias->aliasname : pstrdup("graph_table");
    Alias      *eref;
    int         numaliases;
    int         varattno;
    ListCell   *lc;
    List       *coltypes = NIL;
    List       *coltypmods = NIL;
    List       *colcollations = NIL;
    RTEPermissionInfo *perminfo;
    ParseNamespaceItem *nsitem;
 
    Assert(pstate != NULL);
 
    rte->rtekind = RTE_GRAPH_TABLE;
    rte->relid = graphid;
    rte->relkind = RELKIND_PROPGRAPH;
    rte->graph_pattern = graph_pattern;
    rte->graph_table_columns = columns;
    rte->alias = alias;
    rte->rellockmode = AccessShareLock;
 
    eref = alias ? copyObject(alias) : makeAlias(refname, NIL);
 
    if (!eref->colnames)
        eref->colnames = colnames;
 
    numaliases = list_length(eref->colnames);
 
    /* fill in any unspecified alias columns */
    varattno = 0;
    foreach(lc, colnames)
    {
        varattno++;
        if (varattno > numaliases)
            eref->colnames = lappend(eref->colnames, lfirst(lc));
    }
    if (varattno < numaliases)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("GRAPH_TABLE \"%s\" has %d columns available but %d columns specified",
                        refname, varattno, numaliases)));
 
    rte->eref = eref;
 
    foreach(lc, columns)
    {
        TargetEntry *te = lfirst_node(TargetEntry, lc);
        Node       *colexpr = (Node *) te->expr;
 
        coltypes = lappend_oid(coltypes, exprType(colexpr));
        coltypmods = lappend_int(coltypmods, exprTypmod(colexpr));
        colcollations = lappend_oid(colcollations, exprCollation(colexpr));
    }
 
    /*
     * Set flags and access permissions.
     */
    rte->lateral = lateral;
    rte->inFromCl = inFromCl;
 
    perminfo = addRTEPermissionInfo(&pstate->p_rteperminfos, rte);
    perminfo->requiredPerms = ACL_SELECT;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    nsitem = buildNSItemFromLists(rte, list_length(pstate->p_rtable),
                                  coltypes, coltypmods, colcollations);
 
    nsitem->p_perminfo = perminfo;
 
    return nsitem;
}

References AccessShareLock, ACL_SELECT, addRTEPermissionInfo(), Alias::aliasname, Assert, buildNSItemFromLists(), copyObject, ereport, errcode(), errmsg, ERROR, TargetEntry::expr, exprCollation(), exprType(), exprTypmod(), fb(), lappend(), lappend_int(), lappend_oid(), lfirst, lfirst_node, list_length(), makeAlias(), makeNode, NIL, ParseState::p_rtable, ParseState::p_rteperminfos, pstrdup(), and RTE_GRAPH_TABLE.

Referenced by transformRangeGraphTable().

addRangeTableEntryForGroup()

ParseNamespaceItem * addRangeTableEntryForGroup ( ParseState *  pstate, List *  groupClauses  )

extern

Definition at line 2698 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    Alias      *eref;
    List       *groupexprs;
    List       *coltypes,
               *coltypmods,
               *colcollations;
    ListCell   *lc;
    ParseNamespaceItem *nsitem;
 
    Assert(pstate != NULL);
 
    rte->rtekind = RTE_GROUP;
    rte->alias = NULL;
 
    eref = makeAlias("*GROUP*", NIL);
 
    /* fill in any unspecified alias columns, and extract column type info */
    groupexprs = NIL;
    coltypes = coltypmods = colcollations = NIL;
    foreach(lc, groupClauses)
    {
        TargetEntry *te = (TargetEntry *) lfirst(lc);
        char       *colname = te->resname ? pstrdup(te->resname) : "?column?";
 
        eref->colnames = lappend(eref->colnames, makeString(colname));
 
        groupexprs = lappend(groupexprs, copyObject(te->expr));
 
        coltypes = lappend_oid(coltypes,
                               exprType((Node *) te->expr));
        coltypmods = lappend_int(coltypmods,
                                 exprTypmod((Node *) te->expr));
        colcollations = lappend_oid(colcollations,
                                    exprCollation((Node *) te->expr));
    }
 
    rte->eref = eref;
    rte->groupexprs = groupexprs;
 
    /*
     * Set flags.
     *
     * The grouping step is never checked for access rights, so no need to
     * perform addRTEPermissionInfo().
     */
    rte->lateral = false;
    rte->inFromCl = false;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    nsitem = buildNSItemFromLists(rte, list_length(pstate->p_rtable),
                                  coltypes, coltypmods, colcollations);
 
    return nsitem;
}

References Assert, buildNSItemFromLists(), copyObject, TargetEntry::expr, exprCollation(), exprType(), exprTypmod(), fb(), lappend(), lappend_int(), lappend_oid(), lfirst, list_length(), makeAlias(), makeNode, makeString(), NIL, ParseState::p_rtable, pstrdup(), and RTE_GROUP.

Referenced by parseCheckAggregates().

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  )

extern

Definition at line 2348 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    Alias      *eref;
    int         numaliases;
    ParseNamespaceItem *nsitem;
 
    Assert(pstate != NULL);
 
    /*
     * Fail if join has too many columns --- we must be able to reference any
     * of the columns with an AttrNumber.
     */
    if (list_length(aliasvars) > MaxAttrNumber)
        ereport(ERROR,
                (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
                 errmsg("joins can have at most %d columns",
                        MaxAttrNumber)));
 
    rte->rtekind = RTE_JOIN;
    rte->relid = InvalidOid;
    rte->subquery = NULL;
    rte->jointype = jointype;
    rte->joinmergedcols = nummergedcols;
    rte->joinaliasvars = aliasvars;
    rte->joinleftcols = leftcols;
    rte->joinrightcols = rightcols;
    rte->join_using_alias = join_using_alias;
    rte->alias = alias;
 
    eref = alias ? copyObject(alias) : makeAlias("unnamed_join", NIL);
    numaliases = list_length(eref->colnames);
 
    /* fill in any unspecified alias columns */
    if (numaliases < list_length(colnames))
        eref->colnames = list_concat(eref->colnames,
                                     list_copy_tail(colnames, numaliases));
 
    if (numaliases > list_length(colnames))
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("join expression \"%s\" has %d columns available but %d columns specified",
                        eref->aliasname, list_length(colnames), numaliases)));
 
    rte->eref = eref;
 
    /*
     * Set flags and access permissions.
     *
     * Joins are never checked for access rights, so no need to perform
     * addRTEPermissionInfo().
     */
    rte->lateral = false;
    rte->inFromCl = inFromCl;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    nsitem = palloc_object(ParseNamespaceItem);
    nsitem->p_names = rte->eref;
    nsitem->p_rte = rte;
    nsitem->p_perminfo = NULL;
    nsitem->p_rtindex = list_length(pstate->p_rtable);
    nsitem->p_nscolumns = nscolumns;
    /* set default visibility flags; might get changed later */
    nsitem->p_rel_visible = true;
    nsitem->p_cols_visible = true;
    nsitem->p_lateral_only = false;
    nsitem->p_lateral_ok = true;
    nsitem->p_returning_type = VAR_RETURNING_DEFAULT;
 
    return nsitem;
}

References Assert, copyObject, ereport, errcode(), errmsg, ERROR, fb(), InvalidOid, lappend(), list_concat(), list_copy_tail(), list_length(), makeAlias(), makeNode, MaxAttrNumber, NIL, ParseState::p_rtable, palloc_object, RTE_JOIN, and VAR_RETURNING_DEFAULT.

Referenced by transformFromClauseItem(), and transformSetOperationStmt().

addRangeTableEntryForRelation()

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

extern

Definition at line 1604 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    RTEPermissionInfo *perminfo;
    char       *refname = alias ? alias->aliasname : RelationGetRelationName(rel);
 
    Assert(pstate != NULL);
 
    Assert(lockmode == AccessShareLock ||
           lockmode == RowShareLock ||
           lockmode == RowExclusiveLock);
    Assert(CheckRelationLockedByMe(rel, lockmode, true));
 
    rte->rtekind = RTE_RELATION;
    rte->alias = alias;
    rte->relid = RelationGetRelid(rel);
    rte->inh = inh;
    rte->relkind = rel->rd_rel->relkind;
    rte->rellockmode = lockmode;
 
    /*
     * Build the list of effective column names using user-supplied aliases
     * and/or actual column names.
     */
    rte->eref = makeAlias(refname, NIL);
    buildRelationAliases(rel->rd_att, alias, rte->eref);
 
    /*
     * Set flags and initialize access permissions.
     *
     * The initial default on access checks is always check-for-READ-access,
     * which is the right thing for all except target tables.
     */
    rte->lateral = false;
    rte->inFromCl = inFromCl;
 
    perminfo = addRTEPermissionInfo(&pstate->p_rteperminfos, rte);
    perminfo->requiredPerms = ACL_SELECT;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    return buildNSItemFromTupleDesc(rte, list_length(pstate->p_rtable),
                                    perminfo, rel->rd_att);
}

References AccessShareLock, ACL_SELECT, addRTEPermissionInfo(), Alias::aliasname, Assert, buildNSItemFromTupleDesc(), buildRelationAliases(), CheckRelationLockedByMe(), fb(), lappend(), list_length(), makeAlias(), makeNode, NIL, ParseState::p_rtable, ParseState::p_rteperminfos, RelationData::rd_att, RelationData::rd_rel, RelationGetRelationName, RelationGetRelid, RowExclusiveLock, RowShareLock, and RTE_RELATION.

Referenced by AddRelationNewConstraints(), AlterPolicy(), copy_table(), CreatePolicy(), CreateTriggerFiringOn(), DefineRelation(), DoCopy(), generate_query_for_graph_path(), insert_property_records(), 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  )

extern

Definition at line 1675 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    Alias      *eref;
    int         numaliases;
    List       *coltypes,
               *coltypmods,
               *colcollations;
    int         varattno;
    ListCell   *tlistitem;
    ParseNamespaceItem *nsitem;
 
    Assert(pstate != NULL);
 
    rte->rtekind = RTE_SUBQUERY;
    rte->subquery = subquery;
    rte->alias = alias;
 
    eref = alias ? copyObject(alias) : makeAlias("unnamed_subquery", NIL);
    numaliases = list_length(eref->colnames);
 
    /* fill in any unspecified alias columns, and extract column type info */
    coltypes = coltypmods = colcollations = NIL;
    varattno = 0;
    foreach(tlistitem, subquery->targetList)
    {
        TargetEntry *te = (TargetEntry *) lfirst(tlistitem);
 
        if (te->resjunk)
            continue;
        varattno++;
        Assert(varattno == te->resno);
        if (varattno > numaliases)
        {
            char       *attrname;
 
            attrname = pstrdup(te->resname);
            eref->colnames = lappend(eref->colnames, makeString(attrname));
        }
        coltypes = lappend_oid(coltypes,
                               exprType((Node *) te->expr));
        coltypmods = lappend_int(coltypmods,
                                 exprTypmod((Node *) te->expr));
        colcollations = lappend_oid(colcollations,
                                    exprCollation((Node *) te->expr));
    }
    if (varattno < numaliases)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("table \"%s\" has %d columns available but %d columns specified",
                        eref->aliasname, varattno, numaliases)));
 
    rte->eref = eref;
 
    /*
     * Set flags.
     *
     * Subqueries are never checked for access rights, so no need to perform
     * addRTEPermissionInfo().
     */
    rte->lateral = lateral;
    rte->inFromCl = inFromCl;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    nsitem = buildNSItemFromLists(rte, list_length(pstate->p_rtable),
                                  coltypes, coltypmods, colcollations);
 
    /*
     * Mark it visible as a relation name only if it had a user-written alias.
     */
    nsitem->p_rel_visible = (alias != NULL);
 
    return nsitem;
}

References Assert, buildNSItemFromLists(), copyObject, ereport, errcode(), errmsg, ERROR, TargetEntry::expr, exprCollation(), exprType(), exprTypmod(), fb(), lappend(), lappend_int(), lappend_oid(), lfirst, list_length(), makeAlias(), makeNode, makeString(), NIL, ParseState::p_rtable, pstrdup(), TargetEntry::resno, RTE_SUBQUERY, and Query::targetList.

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

addRangeTableEntryForTableFunc()

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

extern

Definition at line 2088 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    char       *refname;
    Alias      *eref;
    int         numaliases;
 
    Assert(pstate != NULL);
 
    /* Disallow more columns than will fit in a tuple */
    if (list_length(tf->colnames) > MaxTupleAttributeNumber)
        ereport(ERROR,
                (errcode(ERRCODE_TOO_MANY_COLUMNS),
                 errmsg("functions in FROM can return at most %d columns",
                        MaxTupleAttributeNumber),
                 parser_errposition(pstate,
                                    exprLocation((Node *) tf))));
    Assert(list_length(tf->coltypes) == list_length(tf->colnames));
    Assert(list_length(tf->coltypmods) == list_length(tf->colnames));
    Assert(list_length(tf->colcollations) == list_length(tf->colnames));
 
    rte->rtekind = RTE_TABLEFUNC;
    rte->relid = InvalidOid;
    rte->subquery = NULL;
    rte->tablefunc = tf;
    rte->coltypes = tf->coltypes;
    rte->coltypmods = tf->coltypmods;
    rte->colcollations = tf->colcollations;
    rte->alias = alias;
 
    refname = alias ? alias->aliasname :
        pstrdup(tf->functype == TFT_XMLTABLE ? "xmltable" : "json_table");
    eref = alias ? copyObject(alias) : makeAlias(refname, NIL);
    numaliases = list_length(eref->colnames);
 
    /* fill in any unspecified alias columns */
    if (numaliases < list_length(tf->colnames))
        eref->colnames = list_concat(eref->colnames,
                                     list_copy_tail(tf->colnames, numaliases));
 
    if (numaliases > list_length(tf->colnames))
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("%s function has %d columns available but %d columns specified",
                        tf->functype == TFT_XMLTABLE ? "XMLTABLE" : "JSON_TABLE",
                        list_length(tf->colnames), numaliases)));
 
    rte->eref = eref;
 
    /*
     * Set flags and access permissions.
     *
     * Tablefuncs are never checked for access rights (at least, not by
     * ExecCheckPermissions()), so no need to perform addRTEPermissionInfo().
     */
    rte->lateral = lateral;
    rte->inFromCl = inFromCl;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    return buildNSItemFromLists(rte, list_length(pstate->p_rtable),
                                rte->coltypes, rte->coltypmods,
                                rte->colcollations);
}

References Alias::aliasname, Assert, buildNSItemFromLists(), copyObject, ereport, errcode(), errmsg, ERROR, exprLocation(), fb(), TableFunc::functype, InvalidOid, lappend(), list_concat(), list_copy_tail(), list_length(), makeAlias(), makeNode, MaxTupleAttributeNumber, NIL, ParseState::p_rtable, parser_errposition(), pstrdup(), RTE_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  )

extern

Definition at line 2266 of file parse_relation.c.

{
    RangeTblEntry *rte = makeNode(RangeTblEntry);
    char       *refname = alias ? alias->aliasname : pstrdup("*VALUES*");
    Alias      *eref;
    int         numaliases;
    int         numcolumns;
 
    Assert(pstate != NULL);
 
    rte->rtekind = RTE_VALUES;
    rte->relid = InvalidOid;
    rte->subquery = NULL;
    rte->values_lists = exprs;
    rte->coltypes = coltypes;
    rte->coltypmods = coltypmods;
    rte->colcollations = colcollations;
    rte->alias = alias;
 
    eref = alias ? copyObject(alias) : makeAlias(refname, NIL);
 
    /* fill in any unspecified alias columns */
    numcolumns = list_length((List *) linitial(exprs));
    numaliases = list_length(eref->colnames);
    while (numaliases < numcolumns)
    {
        char        attrname[64];
 
        numaliases++;
        snprintf(attrname, sizeof(attrname), "column%d", numaliases);
        eref->colnames = lappend(eref->colnames,
                                 makeString(pstrdup(attrname)));
    }
    if (numcolumns < numaliases)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("VALUES lists \"%s\" have %d columns available but %d columns specified",
                        refname, numcolumns, numaliases)));
 
    rte->eref = eref;
 
    /*
     * Set flags and access permissions.
     *
     * Subqueries are never checked for access rights, so no need to perform
     * addRTEPermissionInfo().
     */
    rte->lateral = lateral;
    rte->inFromCl = inFromCl;
 
    /*
     * Add completed RTE to pstate's range table list, so that we know its
     * index.  But we don't add it to the join list --- caller must do that if
     * appropriate.
     */
    pstate->p_rtable = lappend(pstate->p_rtable, rte);
 
    /*
     * Build a ParseNamespaceItem, but don't add it to the pstate's namespace
     * list --- caller must do that if appropriate.
     */
    return buildNSItemFromLists(rte, list_length(pstate->p_rtable),
                                rte->coltypes, rte->coltypmods,
                                rte->colcollations);
}

References Alias::aliasname, Assert, buildNSItemFromLists(), copyObject, ereport, errcode(), errmsg, ERROR, fb(), InvalidOid, lappend(), linitial, list_length(), makeAlias(), makeNode, makeString(), NIL, ParseState::p_rtable, pstrdup(), RTE_VALUES, and snprintf.

Referenced by transformInsertStmt(), and transformValuesClause().

addRTEPermissionInfo()

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

extern

Definition at line 4051 of file parse_relation.c.

{
    RTEPermissionInfo *perminfo;
 
    Assert(OidIsValid(rte->relid));
    Assert(rte->perminfoindex == 0);
 
    /* Nope, so make one and add to the list. */
    perminfo = makeNode(RTEPermissionInfo);
    perminfo->relid = rte->relid;
    perminfo->inh = rte->inh;
    /* Other information is set by fetching the node as and where needed. */
 
    *rteperminfos = lappend(*rteperminfos, perminfo);
 
    /* Note its index (1-based!) */
    rte->perminfoindex = list_length(*rteperminfos);
 
    return perminfo;
}

References Assert, fb(), lappend(), list_length(), makeNode, and OidIsValid.

Referenced by add_rte_to_flat_rtable(), addRangeTableEntry(), addRangeTableEntryForGraphTable(), 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  )

extern

Definition at line 3706 of file parse_relation.c.

{
    int         i;
 
    for (i = 0; i < RelationGetNumberOfAttributes(rd); i++)
    {
        Form_pg_attribute att = TupleDescAttr(rd->rd_att, i);
 
        if (namestrcmp(&(att->attname), attname) == 0 && !att->attisdropped)
            return i + 1;
    }
 
    if (sysColOK)
    {
        if ((i = specialAttNum(attname)) != InvalidAttrNumber)
            return i;
    }
 
    /* on failure */
    return InvalidAttrNumber;
}

References attname, fb(), i, InvalidAttrNumber, namestrcmp(), RelationGetNumberOfAttributes, specialAttNum(), and TupleDescAttr().

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

attnumAttName()

const NameData * attnumAttName ( Relation  rd, int  attid  )

extern

Definition at line 3757 of file parse_relation.c.

{
    if (attid <= 0)
    {
        const FormData_pg_attribute *sysatt;
 
        sysatt = SystemAttributeDefinition(attid);
        return &sysatt->attname;
    }
    if (attid > rd->rd_att->natts)
        elog(ERROR, "invalid attribute number %d", attid);
    return &TupleDescAttr(rd->rd_att, attid - 1)->attname;
}

References elog, ERROR, fb(), FormData_pg_attribute, SystemAttributeDefinition(), and TupleDescAttr().

Referenced by transformFkeyGetPrimaryKey().

attnumCollationId()

Oid attnumCollationId ( Relation  rd, int  attid  )

extern

Definition at line 3799 of file parse_relation.c.

{
    if (attid <= 0)
    {
        /* All system attributes are of noncollatable types. */
        return InvalidOid;
    }
    if (attid > rd->rd_att->natts)
        elog(ERROR, "invalid attribute number %d", attid);
    return TupleDescAttr(rd->rd_att, attid - 1)->attcollation;
}

References elog, ERROR, fb(), InvalidOid, and TupleDescAttr().

Referenced by transformFkeyGetPrimaryKey().

attnumTypeId()

Oid attnumTypeId ( Relation  rd, int  attid  )

extern

Definition at line 3779 of file parse_relation.c.

{
    if (attid <= 0)
    {
        const FormData_pg_attribute *sysatt;
 
        sysatt = SystemAttributeDefinition(attid);
        return sysatt->atttypid;
    }
    if (attid > rd->rd_att->natts)
        elog(ERROR, "invalid attribute number %d", attid);
    return TupleDescAttr(rd->rd_att, attid - 1)->atttypid;
}

References elog, ERROR, fb(), FormData_pg_attribute, SystemAttributeDefinition(), and TupleDescAttr().

Referenced by transformAssignedExpr(), and transformFkeyGetPrimaryKey().

checkNameSpaceConflicts()

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

extern

Definition at line 438 of file parse_relation.c.

{
    ListCell   *l1;
 
    foreach(l1, namespace1)
    {
        ParseNamespaceItem *nsitem1 = (ParseNamespaceItem *) lfirst(l1);
        RangeTblEntry *rte1 = nsitem1->p_rte;
        const char *aliasname1 = nsitem1->p_names->aliasname;
        ListCell   *l2;
 
        if (!nsitem1->p_rel_visible)
            continue;
 
        foreach(l2, namespace2)
        {
            ParseNamespaceItem *nsitem2 = (ParseNamespaceItem *) lfirst(l2);
            RangeTblEntry *rte2 = nsitem2->p_rte;
            const char *aliasname2 = nsitem2->p_names->aliasname;
 
            if (!nsitem2->p_rel_visible)
                continue;
            if (strcmp(aliasname2, aliasname1) != 0)
                continue;       /* definitely no conflict */
            if (rte1->rtekind == RTE_RELATION && rte1->alias == NULL &&
                rte2->rtekind == RTE_RELATION && rte2->alias == NULL &&
                rte1->relid != rte2->relid)
                continue;       /* no conflict per SQL rule */
            ereport(ERROR,
                    (errcode(ERRCODE_DUPLICATE_ALIAS),
                     errmsg("table name \"%s\" specified more than once",
                            aliasname1)));
        }
    }
}

References ereport, errcode(), errmsg, ERROR, fb(), lfirst, and RTE_RELATION.

Referenced by transformFromClause(), and transformFromClauseItem().

colNameToVar()

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

extern

Definition at line 926 of file parse_relation.c.

{
    Node       *result = NULL;
    int         sublevels_up = 0;
    ParseState *orig_pstate = pstate;
 
    while (pstate != NULL)
    {
        ListCell   *l;
 
        foreach(l, pstate->p_namespace)
        {
            ParseNamespaceItem *nsitem = (ParseNamespaceItem *) lfirst(l);
            Node       *newresult;
 
            /* Ignore table-only items */
            if (!nsitem->p_cols_visible)
                continue;
            /* If not inside LATERAL, ignore lateral-only items */
            if (nsitem->p_lateral_only && !pstate->p_lateral_active)
                continue;
 
            /* use orig_pstate here for consistency with other callers */
            newresult = scanNSItemForColumn(orig_pstate, nsitem, sublevels_up,
                                            colname, location);
 
            if (newresult)
            {
                if (result)
                    ereport(ERROR,
                            (errcode(ERRCODE_AMBIGUOUS_COLUMN),
                             errmsg("column reference \"%s\" is ambiguous",
                                    colname),
                             parser_errposition(pstate, location)));
                check_lateral_ref_ok(pstate, nsitem, location);
                result = newresult;
            }
        }
 
        if (result != NULL || localonly)
            break;              /* found, or don't want to look at parent */
 
        pstate = pstate->parentParseState;
        sublevels_up++;
    }
 
    return result;
}

References check_lateral_ref_ok(), ereport, errcode(), errmsg, ERROR, fb(), lfirst, ParseState::p_lateral_active, ParseState::p_namespace, ParseState::parentParseState, parser_errposition(), result, and scanNSItemForColumn().

Referenced by findTargetlistEntrySQL92(), and transformColumnRef().

errorMissingColumn()

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

extern

Definition at line 3889 of file parse_relation.c.

{
    FuzzyAttrMatchState *state;
 
    /*
     * Search the entire rtable looking for possible matches.  If we find one,
     * emit a hint about it.
     */
    state = searchRangeTableForCol(pstate, relname, colname, location);
 
    /*
     * If there are exact match(es), they must be inaccessible for some
     * reason.
     */
    if (state->rexact1)
    {
        /*
         * We don't try too hard when there's multiple inaccessible exact
         * matches, but at least be sure that we don't misleadingly suggest
         * that there's only one.
         */
        if (state->rexact2)
            ereport(ERROR,
                    (errcode(ERRCODE_UNDEFINED_COLUMN),
                     relname ?
                     errmsg("column %s.%s does not exist", relname, colname) :
                     errmsg("column \"%s\" does not exist", colname),
                     errdetail("There are columns named \"%s\", but they are in tables that cannot be referenced from this part of the query.",
                               colname),
                     !relname ? errhint("Try using a table-qualified name.") : 0,
                     parser_errposition(pstate, location)));
        /* Single exact match, so try to determine why it's inaccessible. */
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_COLUMN),
                 relname ?
                 errmsg("column %s.%s does not exist", relname, colname) :
                 errmsg("column \"%s\" does not exist", colname),
                 errdetail("There is a column named \"%s\" in table \"%s\", but it cannot be referenced from this part of the query.",
                           colname, state->rexact1->eref->aliasname),
                 rte_visible_if_lateral(pstate, state->rexact1) ?
                 errhint("To reference that column, you must mark this subquery with LATERAL.") :
                 (!relname && rte_visible_if_qualified(pstate, state->rexact1)) ?
                 errhint("To reference that column, you must use a table-qualified name.") : 0,
                 parser_errposition(pstate, location)));
    }
 
    if (!state->rsecond)
    {
        /* If we found no match at all, we have little to report */
        if (!state->rfirst)
            ereport(ERROR,
                    (errcode(ERRCODE_UNDEFINED_COLUMN),
                     relname ?
                     errmsg("column %s.%s does not exist", relname, colname) :
                     errmsg("column \"%s\" does not exist", colname),
                     parser_errposition(pstate, location)));
        /* Handle case where we have a single alternative spelling to offer */
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_COLUMN),
                 relname ?
                 errmsg("column %s.%s does not exist", relname, colname) :
                 errmsg("column \"%s\" does not exist", colname),
                 errhint("Perhaps you meant to reference the column \"%s.%s\".",
                         state->rfirst->eref->aliasname,
                         strVal(list_nth(state->rfirst->eref->colnames,
                                         state->first - 1))),
                 parser_errposition(pstate, location)));
    }
    else
    {
        /* Handle case where there are two equally useful column hints */
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_COLUMN),
                 relname ?
                 errmsg("column %s.%s does not exist", relname, colname) :
                 errmsg("column \"%s\" does not exist", colname),
                 errhint("Perhaps you meant to reference the column \"%s.%s\" or the column \"%s.%s\".",
                         state->rfirst->eref->aliasname,
                         strVal(list_nth(state->rfirst->eref->colnames,
                                         state->first - 1)),
                         state->rsecond->eref->aliasname,
                         strVal(list_nth(state->rsecond->eref->colnames,
                                         state->second - 1))),
                 parser_errposition(pstate, location)));
    }
}

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

Referenced by transformColumnRef().

errorMissingRTE()

pg_noreturn void errorMissingRTE ( ParseState *  pstate, RangeVar *  relation  )

extern

Definition at line 3818 of file parse_relation.c.

{
    RangeTblEntry *rte;
    const char *badAlias = NULL;
 
    /*
     * Check to see if there are any potential matches in the query's
     * rangetable.  (Note: cases involving a bad schema name in the RangeVar
     * will throw error immediately here.  That seems OK.)
     */
    rte = searchRangeTableForRel(pstate, relation);
 
    /*
     * If we found a match that has an alias and the alias is visible in the
     * namespace, then the problem is probably use of the relation's real name
     * instead of its alias, ie "SELECT foo.* FROM foo f". This mistake is
     * common enough to justify a specific hint.
     *
     * If we found a match that doesn't meet those criteria, assume the
     * problem is illegal use of a relation outside its scope, as in the
     * MySQL-ism "SELECT ... FROM a, b LEFT JOIN c ON (a.x = c.y)".
     */
    if (rte && rte->alias &&
        strcmp(rte->eref->aliasname, relation->relname) != 0)
    {
        ParseNamespaceItem *nsitem;
        int         sublevels_up;
 
        nsitem = refnameNamespaceItem(pstate, NULL, rte->eref->aliasname,
                                      relation->location,
                                      &sublevels_up);
        if (nsitem && nsitem->p_rte == rte)
            badAlias = rte->eref->aliasname;
    }
 
    /* If it looks like the user forgot to use an alias, hint about that */
    if (badAlias)
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_TABLE),
                 errmsg("invalid reference to FROM-clause entry for table \"%s\"",
                        relation->relname),
                 errhint("Perhaps you meant to reference the table alias \"%s\".",
                         badAlias),
                 parser_errposition(pstate, relation->location)));
    /* Hint about case where we found an (inaccessible) exact match */
    else if (rte)
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_TABLE),
                 errmsg("invalid reference to FROM-clause entry for table \"%s\"",
                        relation->relname),
                 errdetail("There is an entry for table \"%s\", but it cannot be referenced from this part of the query.",
                           rte->eref->aliasname),
                 rte_visible_if_lateral(pstate, rte) ?
                 errhint("To reference that table, you must mark this subquery with LATERAL.") : 0,
                 parser_errposition(pstate, relation->location)));
    /* Else, we have nothing to offer but the bald statement of error */
    else
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_TABLE),
                 errmsg("missing FROM-clause entry for table \"%s\"",
                        relation->relname),
                 parser_errposition(pstate, relation->location)));
}

References ereport, errcode(), ERRCODE_UNDEFINED_TABLE, errdetail(), errhint(), errmsg, ERROR, fb(), RangeVar::location, 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  )

extern

Definition at line 3408 of file parse_relation.c.

{
    RangeTblEntry *rte = nsitem->p_rte;
    RTEPermissionInfo *perminfo = nsitem->p_perminfo;
    List       *names,
               *vars;
    ListCell   *name,
               *var;
    List       *te_list = NIL;
 
    vars = expandNSItemVars(pstate, nsitem, sublevels_up, location, &names);
 
    /*
     * Require read access to the table.  This is normally redundant with the
     * markVarForSelectPriv calls below, but not if the table has zero
     * columns.  We need not do anything if the nsitem is for a join: its
     * component tables will have been marked ACL_SELECT when they were added
     * to the rangetable.  (This step changes things only for the target
     * relation of UPDATE/DELETE, which cannot be under a join.)
     */
    if (rte->rtekind == RTE_RELATION)
    {
        Assert(perminfo != NULL);
        perminfo->requiredPerms |= ACL_SELECT;
    }
 
    forboth(name, names, var, vars)
    {
        char       *label = strVal(lfirst(name));
        Var        *varnode = (Var *) lfirst(var);
        TargetEntry *te;
 
        te = makeTargetEntry((Expr *) varnode,
                             (AttrNumber) pstate->p_next_resno++,
                             label,
                             false);
        te_list = lappend(te_list, te);
 
        if (require_col_privs)
        {
            /* Require read access to each column */
            markVarForSelectPriv(pstate, varnode);
        }
    }
 
    Assert(name == NULL && var == NULL);    /* lists not the same length? */
 
    return te_list;
}

References ACL_SELECT, Assert, expandNSItemVars(), fb(), forboth, label, lappend(), lfirst, makeTargetEntry(), markVarForSelectPriv(), name, NIL, ParseState::p_next_resno, RTE_RELATION, and strVal.

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

expandNSItemVars()

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

extern

Definition at line 3343 of file parse_relation.c.

{
    List       *result = NIL;
    int         colindex;
    ListCell   *lc;
 
    if (colnames)
        *colnames = NIL;
    colindex = 0;
    foreach(lc, nsitem->p_names->colnames)
    {
        String     *colnameval = lfirst(lc);
        const char *colname = strVal(colnameval);
        ParseNamespaceColumn *nscol = nsitem->p_nscolumns + colindex;
 
        if (nscol->p_dontexpand)
        {
            /* skip */
        }
        else if (colname[0])
        {
            Var        *var;
 
            Assert(nscol->p_varno > 0);
            var = makeVar(nscol->p_varno,
                          nscol->p_varattno,
                          nscol->p_vartype,
                          nscol->p_vartypmod,
                          nscol->p_varcollid,
                          sublevels_up);
            /* makeVar doesn't offer parameters for these, so set by hand: */
            var->varreturningtype = nscol->p_varreturningtype;
            var->varnosyn = nscol->p_varnosyn;
            var->varattnosyn = nscol->p_varattnosyn;
            var->location = location;
 
            /* ... and update varnullingrels */
            markNullableIfNeeded(pstate, var);
 
            result = lappend(result, var);
            if (colnames)
                *colnames = lappend(*colnames, colnameval);
        }
        else
        {
            /* dropped column, ignore */
            Assert(nscol->p_varno == 0);
        }
        colindex++;
    }
    return result;
}

References Assert, fb(), lappend(), lfirst, Var::location, makeVar(), markNullableIfNeeded(), NIL, result, strVal, and Var::varreturningtype.

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

expandRTE()

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

extern

Definition at line 2866 of file parse_relation.c.

{
    int         varattno;
 
    if (colnames)
        *colnames = NIL;
    if (colvars)
        *colvars = NIL;
 
    switch (rte->rtekind)
    {
        case RTE_RELATION:
            /* Ordinary relation RTE */
            expandRelation(rte->relid, rte->eref,
                           rtindex, sublevels_up, returning_type, location,
                           include_dropped, colnames, colvars);
            break;
        case RTE_SUBQUERY:
            {
                /* Subquery RTE */
                ListCell   *aliasp_item = list_head(rte->eref->colnames);
                ListCell   *tlistitem;
 
                varattno = 0;
                foreach(tlistitem, rte->subquery->targetList)
                {
                    TargetEntry *te = (TargetEntry *) lfirst(tlistitem);
 
                    if (te->resjunk)
                        continue;
                    varattno++;
                    Assert(varattno == te->resno);
 
                    /*
                     * Formerly it was possible for the subquery tlist to have
                     * more non-junk entries than the colnames list does (if
                     * this RTE has been expanded from a view that has more
                     * columns than it did when the current query was parsed).
                     * Now that ApplyRetrieveRule cleans up such cases, we
                     * shouldn't see that anymore, but let's just check.
                     */
                    if (!aliasp_item)
                        elog(ERROR, "too few column names for subquery %s",
                             rte->eref->aliasname);
 
                    if (colnames)
                    {
                        char       *label = strVal(lfirst(aliasp_item));
 
                        *colnames = lappend(*colnames, makeString(pstrdup(label)));
                    }
 
                    if (colvars)
                    {
                        Var        *varnode;
 
                        varnode = makeVar(rtindex, varattno,
                                          exprType((Node *) te->expr),
                                          exprTypmod((Node *) te->expr),
                                          exprCollation((Node *) te->expr),
                                          sublevels_up);
                        varnode->varreturningtype = returning_type;
                        varnode->location = location;
 
                        *colvars = lappend(*colvars, varnode);
                    }
 
                    aliasp_item = lnext(rte->eref->colnames, aliasp_item);
                }
            }
            break;
        case RTE_FUNCTION:
            {
                /* Function RTE */
                int         atts_done = 0;
                ListCell   *lc;
 
                foreach(lc, rte->functions)
                {
                    RangeTblFunction *rtfunc = (RangeTblFunction *) lfirst(lc);
                    TypeFuncClass functypclass;
                    Oid         funcrettype = InvalidOid;
                    TupleDesc   tupdesc = NULL;
 
                    /* If it has a coldeflist, it returns RECORD */
                    if (rtfunc->funccolnames != NIL)
                        functypclass = TYPEFUNC_RECORD;
                    else
                        functypclass = get_expr_result_type(rtfunc->funcexpr,
                                                            &funcrettype,
                                                            &tupdesc);
 
                    if (functypclass == TYPEFUNC_COMPOSITE ||
                        functypclass == TYPEFUNC_COMPOSITE_DOMAIN)
                    {
                        /* Composite data type, e.g. a table's row type */
                        Assert(tupdesc);
                        expandTupleDesc(tupdesc, rte->eref,
                                        rtfunc->funccolcount, atts_done,
                                        rtindex, sublevels_up,
                                        returning_type, location,
                                        include_dropped, colnames, colvars);
                    }
                    else if (functypclass == TYPEFUNC_SCALAR)
                    {
                        /* Base data type, i.e. scalar */
                        if (colnames)
                            *colnames = lappend(*colnames,
                                                list_nth(rte->eref->colnames,
                                                         atts_done));
 
                        if (colvars)
                        {
                            Var        *varnode;
 
                            varnode = makeVar(rtindex, atts_done + 1,
                                              funcrettype,
                                              exprTypmod(rtfunc->funcexpr),
                                              exprCollation(rtfunc->funcexpr),
                                              sublevels_up);
                            varnode->varreturningtype = returning_type;
                            varnode->location = location;
 
                            *colvars = lappend(*colvars, varnode);
                        }
                    }
                    else if (functypclass == TYPEFUNC_RECORD)
                    {
                        if (colnames)
                        {
                            List       *namelist;
 
                            /* extract appropriate subset of column list */
                            namelist = list_copy_tail(rte->eref->colnames,
                                                      atts_done);
                            namelist = list_truncate(namelist,
                                                     rtfunc->funccolcount);
                            *colnames = list_concat(*colnames, namelist);
                        }
 
                        if (colvars)
                        {
                            ListCell   *l1;
                            ListCell   *l2;
                            ListCell   *l3;
                            int         attnum = atts_done;
 
                            forthree(l1, rtfunc->funccoltypes,
                                     l2, rtfunc->funccoltypmods,
                                     l3, rtfunc->funccolcollations)
                            {
                                Oid         attrtype = lfirst_oid(l1);
                                int32       attrtypmod = lfirst_int(l2);
                                Oid         attrcollation = lfirst_oid(l3);
                                Var        *varnode;
 
                                attnum++;
                                varnode = makeVar(rtindex,
                                                  attnum,
                                                  attrtype,
                                                  attrtypmod,
                                                  attrcollation,
                                                  sublevels_up);
                                varnode->varreturningtype = returning_type;
                                varnode->location = location;
                                *colvars = lappend(*colvars, varnode);
                            }
                        }
                    }
                    else
                    {
                        /* addRangeTableEntryForFunction should've caught this */
                        elog(ERROR, "function in FROM has unsupported return type");
                    }
                    atts_done += rtfunc->funccolcount;
                }
 
                /* Append the ordinality column if any */
                if (rte->funcordinality)
                {
                    if (colnames)
                        *colnames = lappend(*colnames,
                                            llast(rte->eref->colnames));
 
                    if (colvars)
                    {
                        Var        *varnode = makeVar(rtindex,
                                                      atts_done + 1,
                                                      INT8OID,
                                                      -1,
                                                      InvalidOid,
                                                      sublevels_up);
 
                        varnode->varreturningtype = returning_type;
                        *colvars = lappend(*colvars, varnode);
                    }
                }
            }
            break;
        case RTE_JOIN:
            {
                /* Join RTE */
                ListCell   *colname;
                ListCell   *aliasvar;
 
                Assert(list_length(rte->eref->colnames) == list_length(rte->joinaliasvars));
 
                varattno = 0;
                forboth(colname, rte->eref->colnames, aliasvar, rte->joinaliasvars)
                {
                    Node       *avar = (Node *) lfirst(aliasvar);
 
                    varattno++;
 
                    /*
                     * During ordinary parsing, there will never be any
                     * deleted columns in the join.  While this function is
                     * also used by the rewriter and planner, they do not
                     * currently call it on any JOIN RTEs.  Therefore, this
                     * next bit is dead code, but it seems prudent to handle
                     * the case correctly anyway.
                     */
                    if (avar == NULL)
                    {
                        if (include_dropped)
                        {
                            if (colnames)
                                *colnames = lappend(*colnames,
                                                    makeString(pstrdup("")));
                            if (colvars)
                            {
                                /*
                                 * Can't use join's column type here (it might
                                 * be dropped!); but it doesn't really matter
                                 * what type the Const claims to be.
                                 */
                                *colvars = lappend(*colvars,
                                                   makeNullConst(INT4OID, -1,
                                                                 InvalidOid));
                            }
                        }
                        continue;
                    }
 
                    if (colnames)
                    {
                        char       *label = strVal(lfirst(colname));
 
                        *colnames = lappend(*colnames,
                                            makeString(pstrdup(label)));
                    }
 
                    if (colvars)
                    {
                        Var        *varnode;
 
                        /*
                         * If the joinaliasvars entry is a simple Var, just
                         * copy it (with adjustment of varlevelsup and
                         * location); otherwise it is a JOIN USING column and
                         * we must generate a join alias Var.  This matches
                         * the results that expansion of "join.*" by
                         * expandNSItemVars would have produced, if we had
                         * access to the ParseNamespaceItem for the join.
                         */
                        if (IsA(avar, Var))
                        {
                            varnode = copyObject((Var *) avar);
                            varnode->varlevelsup = sublevels_up;
                        }
                        else
                            varnode = makeVar(rtindex, varattno,
                                              exprType(avar),
                                              exprTypmod(avar),
                                              exprCollation(avar),
                                              sublevels_up);
                        varnode->varreturningtype = returning_type;
                        varnode->location = location;
 
                        *colvars = lappend(*colvars, varnode);
                    }
                }
            }
            break;
        case RTE_TABLEFUNC:
        case RTE_VALUES:
        case RTE_CTE:
        case RTE_NAMEDTUPLESTORE:
        case RTE_GRAPH_TABLE:
            {
                /* Tablefunc, Values, CTE, or ENR RTE */
                ListCell   *aliasp_item = list_head(rte->eref->colnames);
                ListCell   *lct;
                ListCell   *lcm;
                ListCell   *lcc;
 
                varattno = 0;
                forthree(lct, rte->coltypes,
                         lcm, rte->coltypmods,
                         lcc, rte->colcollations)
                {
                    Oid         coltype = lfirst_oid(lct);
                    int32       coltypmod = lfirst_int(lcm);
                    Oid         colcoll = lfirst_oid(lcc);
 
                    varattno++;
 
                    if (colnames)
                    {
                        /* Assume there is one alias per output column */
                        if (OidIsValid(coltype))
                        {
                            char       *label = strVal(lfirst(aliasp_item));
 
                            *colnames = lappend(*colnames,
                                                makeString(pstrdup(label)));
                        }
                        else if (include_dropped)
                            *colnames = lappend(*colnames,
                                                makeString(pstrdup("")));
 
                        aliasp_item = lnext(rte->eref->colnames, aliasp_item);
                    }
 
                    if (colvars)
                    {
                        if (OidIsValid(coltype))
                        {
                            Var        *varnode;
 
                            varnode = makeVar(rtindex, varattno,
                                              coltype, coltypmod, colcoll,
                                              sublevels_up);
                            varnode->varreturningtype = returning_type;
                            varnode->location = location;
 
                            *colvars = lappend(*colvars, varnode);
                        }
                        else if (include_dropped)
                        {
                            /*
                             * It doesn't really matter what type the Const
                             * claims to be.
                             */
                            *colvars = lappend(*colvars,
                                               makeNullConst(INT4OID, -1,
                                                             InvalidOid));
                        }
                    }
                }
            }
            break;
        case RTE_RESULT:
        case RTE_GROUP:
            /* These expose no columns, so nothing to do */
            break;
        default:
            elog(ERROR, "unrecognized RTE kind: %d", (int) rte->rtekind);
    }
}

References Assert, attnum, copyObject, elog, ERROR, expandRelation(), expandTupleDesc(), TargetEntry::expr, exprCollation(), exprType(), exprTypmod(), fb(), forboth, forthree, RangeTblFunction::funcexpr, 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(), makeNullConst(), makeString(), makeVar(), NIL, OidIsValid, pstrdup(), TargetEntry::resno, RTE_CTE, RTE_FUNCTION, RTE_GRAPH_TABLE, RTE_GROUP, RTE_JOIN, RTE_NAMEDTUPLESTORE, RTE_RELATION, RTE_RESULT, RTE_SUBQUERY, RTE_TABLEFUNC, RTE_VALUES, strVal, TYPEFUNC_COMPOSITE, TYPEFUNC_COMPOSITE_DOMAIN, TYPEFUNC_RECORD, and TYPEFUNC_SCALAR.

Referenced by build_physical_tlist(), expandRecordVariable(), ReplaceVarFromTargetList(), set_relation_column_names(), and transformWholeRowRef().

GetCTEForRTE()

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

extern

Definition at line 593 of file parse_relation.c.

{
    Index       levelsup;
    ListCell   *lc;
 
    Assert(rte->rtekind == RTE_CTE);
    levelsup = rte->ctelevelsup + rtelevelsup;
    while (levelsup-- > 0)
    {
        pstate = pstate->parentParseState;
        if (!pstate)            /* shouldn't happen */
            elog(ERROR, "bad levelsup for CTE \"%s\"", rte->ctename);
    }
    foreach(lc, pstate->p_ctenamespace)
    {
        CommonTableExpr *cte = (CommonTableExpr *) lfirst(lc);
 
        if (strcmp(cte->ctename, rte->ctename) == 0)
            return cte;
    }
    /* shouldn't happen */
    elog(ERROR, "could not find CTE \"%s\"", rte->ctename);
    return NULL;                /* keep compiler quiet */
}

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

Referenced by expandRecordVariable(), and markTargetListOrigin().

GetNSItemByRangeTablePosn()

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

extern

Definition at line 517 of file parse_relation.c.

{
    ListCell   *lc;
 
    while (sublevels_up-- > 0)
    {
        pstate = pstate->parentParseState;
        Assert(pstate != NULL);
    }
    foreach(lc, pstate->p_namespace)
    {
        ParseNamespaceItem *nsitem = (ParseNamespaceItem *) lfirst(lc);
 
        if (nsitem->p_rtindex == varno)
            return nsitem;
    }
    elog(ERROR, "nsitem not found (internal error)");
    return NULL;                /* keep compiler quiet */
}

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

Referenced by transformMergeStmt().

GetNSItemByVar()

ParseNamespaceItem * GetNSItemByVar ( ParseState *  pstate, Var *  var  )

extern

Definition at line 546 of file parse_relation.c.

{
    int         sublevels_up = var->varlevelsup;
    ListCell   *lc;
 
    while (sublevels_up-- > 0)
    {
        pstate = pstate->parentParseState;
        Assert(pstate != NULL);
    }
    foreach(lc, pstate->p_namespace)
    {
        ParseNamespaceItem *nsitem = (ParseNamespaceItem *) lfirst(lc);
 
        if (nsitem->p_rtindex == var->varno &&
            nsitem->p_returning_type == var->varreturningtype)
            return nsitem;
    }
    elog(ERROR, "nsitem not found (internal error)");
    return NULL;                /* keep compiler quiet */
}

References Assert, elog, ERROR, fb(), lfirst, ParseState::p_namespace, ParseState::parentParseState, Var::varlevelsup, Var::varno, and Var::varreturningtype.

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

GetRTEByRangeTablePosn()

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

extern

Definition at line 573 of file parse_relation.c.

{
    while (sublevels_up-- > 0)
    {
        pstate = pstate->parentParseState;
        Assert(pstate != NULL);
    }
    Assert(varno > 0 && varno <= list_length(pstate->p_rtable));
    return rt_fetch(varno, pstate->p_rtable);
}

References Assert, fb(), 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  )

extern

Definition at line 4080 of file parse_relation.c.

{
    RTEPermissionInfo *perminfo;
 
    if (rte->perminfoindex == 0 ||
        rte->perminfoindex > list_length(rteperminfos))
        elog(ERROR, "invalid perminfoindex %u in RTE with relid %u",
             rte->perminfoindex, rte->relid);
    perminfo = list_nth_node(RTEPermissionInfo, rteperminfos,
                             rte->perminfoindex - 1);
    if (perminfo->relid != rte->relid)
        elog(ERROR, "permission info at index %u (with relid=%u) does not match provided RTE (with relid=%u)",
             rte->perminfoindex, perminfo->relid, rte->relid);
 
    return perminfo;
}

References elog, ERROR, fb(), list_length(), and list_nth_node.

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

isLockedRefname()

bool isLockedRefname ( ParseState *  pstate, const char *  refname  )

extern

Definition at line 2781 of file parse_relation.c.

{
    ListCell   *l;
 
    /*
     * If we are in a subquery specified as locked FOR UPDATE/SHARE from
     * parent level, then act as though there's a generic FOR UPDATE here.
     */
    if (pstate->p_locked_from_parent)
        return true;
 
    foreach(l, pstate->p_locking_clause)
    {
        LockingClause *lc = (LockingClause *) lfirst(l);
 
        if (lc->lockedRels == NIL)
        {
            /* all tables used in query */
            return true;
        }
        else if (refname != NULL)
        {
            /* just the named tables */
            ListCell   *l2;
 
            foreach(l2, lc->lockedRels)
            {
                RangeVar   *thisrel = (RangeVar *) lfirst(l2);
 
                if (strcmp(refname, thisrel->relname) == 0)
                    return true;
            }
        }
    }
    return false;
}

References fb(), lfirst, NIL, ParseState::p_locked_from_parent, and ParseState::p_locking_clause.

Referenced by addRangeTableEntry(), and transformRangeSubselect().

markNullableIfNeeded()

void markNullableIfNeeded ( ParseState *  pstate, Var *  var  )

extern

Definition at line 1078 of file parse_relation.c.

{
    int         rtindex = var->varno;
    Bitmapset  *relids;
 
    /* Find the appropriate pstate */
    for (int lv = 0; lv < var->varlevelsup; lv++)
        pstate = pstate->parentParseState;
 
    /* Find currently-relevant join relids for the Var's rel */
    if (rtindex > 0 && rtindex <= list_length(pstate->p_nullingrels))
        relids = (Bitmapset *) list_nth(pstate->p_nullingrels, rtindex - 1);
    else
        relids = NULL;
 
    /*
     * Merge with any already-declared nulling rels.  (Typically there won't
     * be any, but let's get it right if there are.)
     */
    if (relids != NULL)
        var->varnullingrels = bms_union(var->varnullingrels, relids);
}

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

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

markVarForSelectPriv()

void markVarForSelectPriv ( ParseState *  pstate, Var *  var  )

extern

Definition at line 1193 of file parse_relation.c.

{
    Index       lv;
 
    Assert(IsA(var, Var));
    /* Find the appropriate pstate if it's an uplevel Var */
    for (lv = 0; lv < var->varlevelsup; lv++)
        pstate = pstate->parentParseState;
    markRTEForSelectPriv(pstate, var->varno, var->varattno);
}

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

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

parserOpenTable()

Relation parserOpenTable ( ParseState *  pstate, const RangeVar *  relation, LOCKMODE  lockmode  )

extern

Definition at line 1459 of file parse_relation.c.

{
    Relation    rel;
    ParseCallbackState pcbstate;
 
    setup_parser_errposition_callback(&pcbstate, pstate, relation->location);
    rel = table_openrv_extended(relation, lockmode, true);
    if (rel == NULL)
    {
        if (relation->schemaname)
            ereport(ERROR,
                    (errcode(ERRCODE_UNDEFINED_TABLE),
                     errmsg("relation \"%s.%s\" does not exist",
                            relation->schemaname, relation->relname)));
        else
        {
            /*
             * An unqualified name might have been meant as a reference to
             * some not-yet-in-scope CTE.  The bare "does not exist" message
             * has proven remarkably unhelpful for figuring out such problems,
             * so we take pains to offer a specific hint.
             */
            if (isFutureCTE(pstate, relation->relname))
                ereport(ERROR,
                        (errcode(ERRCODE_UNDEFINED_TABLE),
                         errmsg("relation \"%s\" does not exist",
                                relation->relname),
                         errdetail("There is a WITH item named \"%s\", but it cannot be referenced from this part of the query.",
                                   relation->relname),
                         errhint("Use WITH RECURSIVE, or re-order the WITH items to remove forward references.")));
            else
                ereport(ERROR,
                        (errcode(ERRCODE_UNDEFINED_TABLE),
                         errmsg("relation \"%s\" does not exist",
                                relation->relname)));
        }
    }
    cancel_parser_errposition_callback(&pcbstate);
    return rel;
}

References cancel_parser_errposition_callback(), ereport, errcode(), ERRCODE_UNDEFINED_TABLE, errdetail(), errhint(), errmsg, ERROR, fb(), 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  )

extern

Definition at line 130 of file parse_relation.c.

{
    Oid         relId = InvalidOid;
 
    if (sublevels_up)
        *sublevels_up = 0;
 
    if (schemaname != NULL)
    {
        Oid         namespaceId;
 
        /*
         * We can use LookupNamespaceNoError() here because we are only
         * interested in finding existing RTEs.  Checking USAGE permission on
         * the schema is unnecessary since it would have already been checked
         * when the RTE was made.  Furthermore, we want to report "RTE not
         * found", not "no permissions for schema", if the name happens to
         * match a schema name the user hasn't got access to.
         */
        namespaceId = LookupNamespaceNoError(schemaname);
        if (!OidIsValid(namespaceId))
            return NULL;
        relId = get_relname_relid(refname, namespaceId);
        if (!OidIsValid(relId))
            return NULL;
    }
 
    while (pstate != NULL)
    {
        ParseNamespaceItem *result;
 
        if (OidIsValid(relId))
            result = scanNameSpaceForRelid(pstate, relId, location);
        else
            result = scanNameSpaceForRefname(pstate, refname, location);
 
        if (result)
            return result;
 
        if (sublevels_up)
            (*sublevels_up)++;
        else
            break;
 
        pstate = pstate->parentParseState;
    }
    return NULL;
}

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

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

scanNameSpaceForCTE()

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

extern

Definition at line 286 of file parse_relation.c.

{
    Index       levelsup;
 
    for (levelsup = 0;
         pstate != NULL;
         pstate = pstate->parentParseState, levelsup++)
    {
        ListCell   *lc;
 
        foreach(lc, pstate->p_ctenamespace)
        {
            CommonTableExpr *cte = (CommonTableExpr *) lfirst(lc);
 
            if (strcmp(cte->ctename, refname) == 0)
            {
                *ctelevelsup = levelsup;
                return cte;
            }
        }
    }
    return NULL;
}

References CommonTableExpr::ctename, fb(), lfirst, ParseState::p_ctenamespace, and ParseState::parentParseState.

Referenced by getNSItemForSpecialRelationTypes(), and searchRangeTableForRel().

scanNameSpaceForENR()

bool scanNameSpaceForENR ( ParseState *  pstate, const char *  refname  )

extern

Definition at line 339 of file parse_relation.c.

{
    return name_matches_visible_ENR(pstate, refname);
}

References name_matches_visible_ENR().

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

scanNSItemForColumn()

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

extern

Definition at line 716 of file parse_relation.c.

{
    RangeTblEntry *rte = nsitem->p_rte;
    int         attnum;
    Var        *var;
 
    /*
     * Scan the nsitem's column names (or aliases) for a match.  Complain if
     * multiple matches.
     */
    attnum = scanRTEForColumn(pstate, rte, nsitem->p_names,
                              colname, location,
                              0, NULL);
 
    if (attnum == InvalidAttrNumber)
        return NULL;            /* Return NULL if no match */
 
    /* In constraint check, no system column is allowed except tableOid */
    if (pstate->p_expr_kind == EXPR_KIND_CHECK_CONSTRAINT &&
        attnum < InvalidAttrNumber && attnum != TableOidAttributeNumber)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("system column \"%s\" reference in check constraint is invalid",
                        colname),
                 parser_errposition(pstate, location)));
 
    /*
     * In generated column, no system column is allowed except tableOid.
     * (Required for stored generated, but we also do it for virtual generated
     * for now for consistency.)
     */
    if (pstate->p_expr_kind == EXPR_KIND_GENERATED_COLUMN &&
        attnum < InvalidAttrNumber && attnum != TableOidAttributeNumber)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("cannot use system column \"%s\" in column generation expression",
                        colname),
                 parser_errposition(pstate, location)));
 
    /*
     * In a MERGE WHEN condition, no system column is allowed except tableOid
     */
    if (pstate->p_expr_kind == EXPR_KIND_MERGE_WHEN &&
        attnum < InvalidAttrNumber && attnum != TableOidAttributeNumber)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("cannot use system column \"%s\" in MERGE WHEN condition",
                        colname),
                 parser_errposition(pstate, location)));
 
    /* Found a valid match, so build a Var */
    if (attnum > InvalidAttrNumber)
    {
        /* Get attribute data from the ParseNamespaceColumn array */
        ParseNamespaceColumn *nscol = &nsitem->p_nscolumns[attnum - 1];
 
        /* Complain if dropped column.  See notes in scanRTEForColumn. */
        if (nscol->p_varno == 0)
            ereport(ERROR,
                    (errcode(ERRCODE_UNDEFINED_COLUMN),
                     errmsg("column \"%s\" of relation \"%s\" does not exist",
                            colname,
                            nsitem->p_names->aliasname)));
 
        var = makeVar(nscol->p_varno,
                      nscol->p_varattno,
                      nscol->p_vartype,
                      nscol->p_vartypmod,
                      nscol->p_varcollid,
                      sublevels_up);
        /* makeVar doesn't offer parameters for these, so set them by hand: */
        var->varnosyn = nscol->p_varnosyn;
        var->varattnosyn = nscol->p_varattnosyn;
    }
    else
    {
        /* System column, so use predetermined type data */
        const FormData_pg_attribute *sysatt;
 
        sysatt = SystemAttributeDefinition(attnum);
        var = makeVar(nsitem->p_rtindex,
                      attnum,
                      sysatt->atttypid,
                      sysatt->atttypmod,
                      sysatt->attcollation,
                      sublevels_up);
    }
    var->location = location;
 
    /* Mark Var for RETURNING OLD/NEW, as necessary */
    var->varreturningtype = nsitem->p_returning_type;
 
    /* Mark Var if it's nulled by any outer joins */
    markNullableIfNeeded(pstate, var);
 
    /* Require read access to the column */
    markVarForSelectPriv(pstate, var);
 
    return (Node *) var;
}

References attnum, ereport, errcode(), errmsg, ERROR, EXPR_KIND_CHECK_CONSTRAINT, EXPR_KIND_GENERATED_COLUMN, EXPR_KIND_MERGE_WHEN, fb(), FormData_pg_attribute, InvalidAttrNumber, Var::location, makeVar(), markNullableIfNeeded(), markVarForSelectPriv(), ParseState::p_expr_kind, parser_errposition(), scanRTEForColumn(), SystemAttributeDefinition(), TableOidAttributeNumber, and Var::varreturningtype.

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