parse_target.h File Reference

#include "parser/parse_node.h"

Include dependency graph for parse_target.h:

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Functions
List *	transformTargetList (ParseState *pstate, List *targetlist, ParseExprKind exprKind)
List *	transformExpressionList (ParseState *pstate, List *exprlist, ParseExprKind exprKind, bool allowDefault)
void	resolveTargetListUnknowns (ParseState *pstate, List *targetlist)
void	markTargetListOrigins (ParseState *pstate, List *targetlist)
TargetEntry *	transformTargetEntry (ParseState *pstate, Node *node, Node *expr, ParseExprKind exprKind, char *colname, bool resjunk)
Expr *	transformAssignedExpr (ParseState *pstate, Expr *expr, ParseExprKind exprKind, const char *colname, int attrno, List *indirection, int location)
void	updateTargetListEntry (ParseState *pstate, TargetEntry *tle, char *colname, int attrno, List *indirection, int location)
Node *	transformAssignmentIndirection (ParseState *pstate, Node *basenode, const char *targetName, bool targetIsSubscripting, Oid targetTypeId, int32 targetTypMod, Oid targetCollation, List *indirection, ListCell *indirection_cell, Node *rhs, CoercionContext ccontext, int location)
List *	checkInsertTargets (ParseState *pstate, List *cols, List **attrnos)
TupleDesc	expandRecordVariable (ParseState *pstate, Var *var, int levelsup)
char *	FigureColname (Node *node)
char *	FigureIndexColname (Node *node)

Function Documentation

checkInsertTargets()

List* checkInsertTargets	(	ParseState *	pstate,
		List *	cols,
		List **	attrnos
	)

Definition at line 1015 of file parse_target.c.

{
    *attrnos = NIL;
 
    if (cols == NIL)
    {
        /*
         * Generate default column list for INSERT.
         */
        int         numcol = RelationGetNumberOfAttributes(pstate->p_target_relation);
 
        int         i;
 
        for (i = 0; i < numcol; i++)
        {
            ResTarget  *col;
            Form_pg_attribute attr;
 
            attr = TupleDescAttr(pstate->p_target_relation->rd_att, i);
 
            if (attr->attisdropped)
                continue;
 
            col = makeNode(ResTarget);
            col->name = pstrdup(NameStr(attr->attname));
            col->indirection = NIL;
            col->val = NULL;
            col->location = -1;
            cols = lappend(cols, col);
            *attrnos = lappend_int(*attrnos, i + 1);
        }
    }
    else
    {
        /*
         * Do initial validation of user-supplied INSERT column list.
         */
        Bitmapset  *wholecols = NULL;
        Bitmapset  *partialcols = NULL;
        ListCell   *tl;
 
        foreach(tl, cols)
        {
            ResTarget  *col = (ResTarget *) lfirst(tl);
            char       *name = col->name;
            int         attrno;
 
            /* Lookup column name, ereport on failure */
            attrno = attnameAttNum(pstate->p_target_relation, name, false);
            if (attrno == InvalidAttrNumber)
                ereport(ERROR,
                        (errcode(ERRCODE_UNDEFINED_COLUMN),
                         errmsg("column \"%s\" of relation \"%s\" does not exist",
                                name,
                                RelationGetRelationName(pstate->p_target_relation)),
                         parser_errposition(pstate, col->location)));
 
            /*
             * Check for duplicates, but only of whole columns --- we allow
             * INSERT INTO foo (col.subcol1, col.subcol2)
             */
            if (col->indirection == NIL)
            {
                /* whole column; must not have any other assignment */
                if (bms_is_member(attrno, wholecols) ||
                    bms_is_member(attrno, partialcols))
                    ereport(ERROR,
                            (errcode(ERRCODE_DUPLICATE_COLUMN),
                             errmsg("column \"%s\" specified more than once",
                                    name),
                             parser_errposition(pstate, col->location)));
                wholecols = bms_add_member(wholecols, attrno);
            }
            else
            {
                /* partial column; must not have any whole assignment */
                if (bms_is_member(attrno, wholecols))
                    ereport(ERROR,
                            (errcode(ERRCODE_DUPLICATE_COLUMN),
                             errmsg("column \"%s\" specified more than once",
                                    name),
                             parser_errposition(pstate, col->location)));
                partialcols = bms_add_member(partialcols, attrno);
            }
 
            *attrnos = lappend_int(*attrnos, attrno);
        }
    }
 
    return cols;
}

References attnameAttNum(), bms_add_member(), bms_is_member(), ereport, errcode(), errmsg(), ERROR, i, ResTarget::indirection, InvalidAttrNumber, lappend(), lappend_int(), lfirst, ResTarget::location, makeNode, name, ResTarget::name, NameStr, NIL, ParseState::p_target_relation, parser_errposition(), pstrdup(), RelationData::rd_att, RelationGetNumberOfAttributes, RelationGetRelationName, TupleDescAttr, and ResTarget::val.

Referenced by transformInsertStmt(), and transformMergeStmt().

expandRecordVariable()

TupleDesc expandRecordVariable	(	ParseState *	pstate,
		Var *	var,
		int	levelsup
	)

Definition at line 1519 of file parse_target.c.

{
    TupleDesc   tupleDesc;
    int         netlevelsup;
    RangeTblEntry *rte;
    AttrNumber  attnum;
    Node       *expr;
 
    /* Check my caller didn't mess up */
    Assert(IsA(var, Var));
    Assert(var->vartype == RECORDOID);
 
    /*
     * Note: it's tempting to use GetNSItemByRangeTablePosn here so that we
     * can use expandNSItemVars instead of expandRTE; but that does not work
     * for some of the recursion cases below, where we have consed up a
     * ParseState that lacks p_namespace data.
     */
    netlevelsup = var->varlevelsup + levelsup;
    rte = GetRTEByRangeTablePosn(pstate, var->varno, netlevelsup);
    attnum = var->varattno;
 
    if (attnum == InvalidAttrNumber)
    {
        /* Whole-row reference to an RTE, so expand the known fields */
        List       *names,
                   *vars;
        ListCell   *lname,
                   *lvar;
        int         i;
 
        expandRTE(rte, var->varno, 0, var->location, false,
                  &names, &vars);
 
        tupleDesc = CreateTemplateTupleDesc(list_length(vars));
        i = 1;
        forboth(lname, names, lvar, vars)
        {
            char       *label = strVal(lfirst(lname));
            Node       *varnode = (Node *) lfirst(lvar);
 
            TupleDescInitEntry(tupleDesc, i,
                               label,
                               exprType(varnode),
                               exprTypmod(varnode),
                               0);
            TupleDescInitEntryCollation(tupleDesc, i,
                                        exprCollation(varnode));
            i++;
        }
        Assert(lname == NULL && lvar == NULL);  /* lists same length? */
 
        return tupleDesc;
    }
 
    expr = (Node *) var;        /* default if we can't drill down */
 
    switch (rte->rtekind)
    {
        case RTE_RELATION:
        case RTE_VALUES:
        case RTE_NAMEDTUPLESTORE:
        case RTE_RESULT:
 
            /*
             * This case should not occur: a column of a table, values list,
             * or ENR shouldn't have type RECORD.  Fall through and fail (most
             * likely) at the bottom.
             */
            break;
        case RTE_SUBQUERY:
            {
                /* Subselect-in-FROM: examine sub-select's output expr */
                TargetEntry *ste = get_tle_by_resno(rte->subquery->targetList,
                                                    attnum);
 
                if (ste == NULL || ste->resjunk)
                    elog(ERROR, "subquery %s does not have attribute %d",
                         rte->eref->aliasname, attnum);
                expr = (Node *) ste->expr;
                if (IsA(expr, Var))
                {
                    /*
                     * Recurse into the sub-select to see what its Var refers
                     * to.  We have to build an additional level of ParseState
                     * to keep in step with varlevelsup in the subselect;
                     * furthermore, the subquery RTE might be from an outer
                     * query level, in which case the ParseState for the
                     * subselect must have that outer level as parent.
                     */
                    ParseState  mypstate = {0};
                    Index       levelsup;
 
                    /* this loop must work, since GetRTEByRangeTablePosn did */
                    for (levelsup = 0; levelsup < netlevelsup; levelsup++)
                        pstate = pstate->parentParseState;
                    mypstate.parentParseState = pstate;
                    mypstate.p_rtable = rte->subquery->rtable;
                    /* don't bother filling the rest of the fake pstate */
 
                    return expandRecordVariable(&mypstate, (Var *) expr, 0);
                }
                /* else fall through to inspect the expression */
            }
            break;
        case RTE_JOIN:
            /* Join RTE --- recursively inspect the alias variable */
            Assert(attnum > 0 && attnum <= list_length(rte->joinaliasvars));
            expr = (Node *) list_nth(rte->joinaliasvars, attnum - 1);
            Assert(expr != NULL);
            /* We intentionally don't strip implicit coercions here */
            if (IsA(expr, Var))
                return expandRecordVariable(pstate, (Var *) expr, netlevelsup);
            /* else fall through to inspect the expression */
            break;
        case RTE_FUNCTION:
 
            /*
             * We couldn't get here unless a function is declared with one of
             * its result columns as RECORD, which is not allowed.
             */
            break;
        case RTE_TABLEFUNC:
 
            /*
             * Table function cannot have columns with RECORD type.
             */
            break;
        case RTE_CTE:
            /* CTE reference: examine subquery's output expr */
            if (!rte->self_reference)
            {
                CommonTableExpr *cte = GetCTEForRTE(pstate, rte, netlevelsup);
                TargetEntry *ste;
 
                ste = get_tle_by_resno(GetCTETargetList(cte), attnum);
                if (ste == NULL || ste->resjunk)
                    elog(ERROR, "CTE %s does not have attribute %d",
                         rte->eref->aliasname, attnum);
                expr = (Node *) ste->expr;
                if (IsA(expr, Var))
                {
                    /*
                     * Recurse into the CTE to see what its Var refers to. We
                     * have to build an additional level of ParseState to keep
                     * in step with varlevelsup in the CTE; furthermore it
                     * could be an outer CTE (compare SUBQUERY case above).
                     */
                    ParseState  mypstate = {0};
                    Index       levelsup;
 
                    /* this loop must work, since GetCTEForRTE did */
                    for (levelsup = 0;
                         levelsup < rte->ctelevelsup + netlevelsup;
                         levelsup++)
                        pstate = pstate->parentParseState;
                    mypstate.parentParseState = pstate;
                    mypstate.p_rtable = ((Query *) cte->ctequery)->rtable;
                    /* don't bother filling the rest of the fake pstate */
 
                    return expandRecordVariable(&mypstate, (Var *) expr, 0);
                }
                /* else fall through to inspect the expression */
            }
            break;
    }
 
    /*
     * We now have an expression we can't expand any more, so see if
     * get_expr_result_tupdesc() can do anything with it.
     */
    return get_expr_result_tupdesc(expr, false);
}

References Assert, attnum, CreateTemplateTupleDesc(), RangeTblEntry::ctelevelsup, CommonTableExpr::ctequery, elog, ERROR, expandRTE(), TargetEntry::expr, exprCollation(), exprType(), exprTypmod(), forboth, get_expr_result_tupdesc(), get_tle_by_resno(), GetCTEForRTE(), GetCTETargetList, GetRTEByRangeTablePosn(), i, if(), InvalidAttrNumber, IsA, label, lfirst, list_length(), list_nth(), Var::location, ParseState::p_rtable, ParseState::parentParseState, Query::rtable, RTE_CTE, RTE_FUNCTION, RTE_JOIN, RTE_NAMEDTUPLESTORE, RTE_RELATION, RTE_RESULT, RTE_SUBQUERY, RTE_TABLEFUNC, RTE_VALUES, RangeTblEntry::rtekind, strVal, RangeTblEntry::subquery, Query::targetList, TupleDescInitEntry(), TupleDescInitEntryCollation(), Var::varattno, Var::varlevelsup, and Var::varno.

Referenced by ExpandRowReference(), and ParseComplexProjection().

FigureColname()

char* FigureColname

(

Node *

node

)

Definition at line 1704 of file parse_target.c.

{
    char       *name = NULL;
 
    (void) FigureColnameInternal(node, &name);
    if (name != NULL)
        return name;
    /* default result if we can't guess anything */
    return "?column?";
}

References FigureColnameInternal(), and name.

Referenced by transformRangeFunction(), transformTargetEntry(), and transformXmlExpr().

FigureIndexColname()

char* FigureIndexColname

(

Node *

node

)

Definition at line 1723 of file parse_target.c.

{
    char       *name = NULL;
 
    (void) FigureColnameInternal(node, &name);
    return name;
}

References FigureColnameInternal(), and name.

Referenced by transformIndexStmt().

markTargetListOrigins()

void markTargetListOrigins	(	ParseState *	pstate,
		List *	targetlist
	)

Definition at line 318 of file parse_target.c.

{
    ListCell   *l;
 
    foreach(l, targetlist)
    {
        TargetEntry *tle = (TargetEntry *) lfirst(l);
 
        markTargetListOrigin(pstate, tle, (Var *) tle->expr, 0);
    }
}

References TargetEntry::expr, lfirst, and markTargetListOrigin().

Referenced by transformReturningList(), and transformSelectStmt().

resolveTargetListUnknowns()

void resolveTargetListUnknowns	(	ParseState *	pstate,
		List *	targetlist
	)

Definition at line 288 of file parse_target.c.

{
    ListCell   *l;
 
    foreach(l, targetlist)
    {
        TargetEntry *tle = (TargetEntry *) lfirst(l);
        Oid         restype = exprType((Node *) tle->expr);
 
        if (restype == UNKNOWNOID)
        {
            tle->expr = (Expr *) coerce_type(pstate, (Node *) tle->expr,
                                             restype, TEXTOID, -1,
                                             COERCION_IMPLICIT,
                                             COERCE_IMPLICIT_CAST,
                                             -1);
        }
    }
}

References COERCE_IMPLICIT_CAST, coerce_type(), COERCION_IMPLICIT, TargetEntry::expr, exprType(), and lfirst.

Referenced by transformReturningList(), transformReturnStmt(), and transformSelectStmt().

transformAssignedExpr()

Expr* transformAssignedExpr	(	ParseState *	pstate,
		Expr *	expr,
		ParseExprKind	exprKind,
		const char *	colname,
		int	attrno,
		List *	indirection,
		int	location
	)

Definition at line 452 of file parse_target.c.

{
    Relation    rd = pstate->p_target_relation;
    Oid         type_id;        /* type of value provided */
    Oid         attrtype;       /* type of target column */
    int32       attrtypmod;
    Oid         attrcollation;  /* collation of target column */
    ParseExprKind sv_expr_kind;
 
    /*
     * Save and restore identity of expression type we're parsing.  We must
     * set p_expr_kind here because we can parse subscripts without going
     * through transformExpr().
     */
    Assert(exprKind != EXPR_KIND_NONE);
    sv_expr_kind = pstate->p_expr_kind;
    pstate->p_expr_kind = exprKind;
 
    Assert(rd != NULL);
    if (attrno <= 0)
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("cannot assign to system column \"%s\"",
                        colname),
                 parser_errposition(pstate, location)));
    attrtype = attnumTypeId(rd, attrno);
    attrtypmod = TupleDescAttr(rd->rd_att, attrno - 1)->atttypmod;
    attrcollation = TupleDescAttr(rd->rd_att, attrno - 1)->attcollation;
 
    /*
     * If the expression is a DEFAULT placeholder, insert the attribute's
     * type/typmod/collation into it so that exprType etc will report the
     * right things.  (We expect that the eventually substituted default
     * expression will in fact have this type and typmod.  The collation
     * likely doesn't matter, but let's set it correctly anyway.)  Also,
     * reject trying to update a subfield or array element with DEFAULT, since
     * there can't be any default for portions of a column.
     */
    if (expr && IsA(expr, SetToDefault))
    {
        SetToDefault *def = (SetToDefault *) expr;
 
        def->typeId = attrtype;
        def->typeMod = attrtypmod;
        def->collation = attrcollation;
        if (indirection)
        {
            if (IsA(linitial(indirection), A_Indices))
                ereport(ERROR,
                        (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                         errmsg("cannot set an array element to DEFAULT"),
                         parser_errposition(pstate, location)));
            else
                ereport(ERROR,
                        (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                         errmsg("cannot set a subfield to DEFAULT"),
                         parser_errposition(pstate, location)));
        }
    }
 
    /* Now we can use exprType() safely. */
    type_id = exprType((Node *) expr);
 
    /*
     * If there is indirection on the target column, prepare an array or
     * subfield assignment expression.  This will generate a new column value
     * that the source value has been inserted into, which can then be placed
     * in the new tuple constructed by INSERT or UPDATE.
     */
    if (indirection)
    {
        Node       *colVar;
 
        if (pstate->p_is_insert)
        {
            /*
             * The command is INSERT INTO table (col.something) ... so there
             * is not really a source value to work with. Insert a NULL
             * constant as the source value.
             */
            colVar = (Node *) makeNullConst(attrtype, attrtypmod,
                                            attrcollation);
        }
        else
        {
            /*
             * Build a Var for the column to be updated.
             */
            Var        *var;
 
            var = makeVar(pstate->p_target_nsitem->p_rtindex, attrno,
                          attrtype, attrtypmod, attrcollation, 0);
            var->location = location;
 
            colVar = (Node *) var;
        }
 
        expr = (Expr *)
            transformAssignmentIndirection(pstate,
                                           colVar,
                                           colname,
                                           false,
                                           attrtype,
                                           attrtypmod,
                                           attrcollation,
                                           indirection,
                                           list_head(indirection),
                                           (Node *) expr,
                                           COERCION_ASSIGNMENT,
                                           location);
    }
    else
    {
        /*
         * For normal non-qualified target column, do type checking and
         * coercion.
         */
        Node       *orig_expr = (Node *) expr;
 
        expr = (Expr *)
            coerce_to_target_type(pstate,
                                  orig_expr, type_id,
                                  attrtype, attrtypmod,
                                  COERCION_ASSIGNMENT,
                                  COERCE_IMPLICIT_CAST,
                                  -1);
        if (expr == NULL)
            ereport(ERROR,
                    (errcode(ERRCODE_DATATYPE_MISMATCH),
                     errmsg("column \"%s\" is of type %s"
                            " but expression is of type %s",
                            colname,
                            format_type_be(attrtype),
                            format_type_be(type_id)),
                     errhint("You will need to rewrite or cast the expression."),
                     parser_errposition(pstate, exprLocation(orig_expr))));
    }
 
    pstate->p_expr_kind = sv_expr_kind;
 
    return expr;
}

References Assert, attnumTypeId(), COERCE_IMPLICIT_CAST, coerce_to_target_type(), COERCION_ASSIGNMENT, ereport, errcode(), errhint(), errmsg(), ERROR, EXPR_KIND_NONE, exprLocation(), exprType(), format_type_be(), IsA, linitial, list_head(), Var::location, makeNullConst(), makeVar(), ParseState::p_expr_kind, ParseState::p_is_insert, ParseNamespaceItem::p_rtindex, ParseState::p_target_nsitem, ParseState::p_target_relation, parser_errposition(), RelationData::rd_att, transformAssignmentIndirection(), TupleDescAttr, and SetToDefault::typeId.

Referenced by transformInsertRow(), and updateTargetListEntry().

transformAssignmentIndirection()

Node* transformAssignmentIndirection	(	ParseState *	pstate,
		Node *	basenode,
		const char *	targetName,
		bool	targetIsSubscripting,
		Oid	targetTypeId,
		int32	targetTypMod,
		Oid	targetCollation,
		List *	indirection,
		ListCell *	indirection_cell,
		Node *	rhs,
		CoercionContext	ccontext,
		int	location
	)

Definition at line 683 of file parse_target.c.

{
    Node       *result;
    List       *subscripts = NIL;
    ListCell   *i;
 
    if (indirection_cell && !basenode)
    {
        /*
         * Set up a substitution.  We abuse CaseTestExpr for this.  It's safe
         * to do so because the only nodes that will be above the CaseTestExpr
         * in the finished expression will be FieldStore and SubscriptingRef
         * nodes. (There could be other stuff in the tree, but it will be
         * within other child fields of those node types.)
         */
        CaseTestExpr *ctest = makeNode(CaseTestExpr);
 
        ctest->typeId = targetTypeId;
        ctest->typeMod = targetTypMod;
        ctest->collation = targetCollation;
        basenode = (Node *) ctest;
    }
 
    /*
     * We have to split any field-selection operations apart from
     * subscripting.  Adjacent A_Indices nodes have to be treated as a single
     * multidimensional subscript operation.
     */
    for_each_cell(i, indirection, indirection_cell)
    {
        Node       *n = lfirst(i);
 
        if (IsA(n, A_Indices))
            subscripts = lappend(subscripts, n);
        else if (IsA(n, A_Star))
        {
            ereport(ERROR,
                    (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                     errmsg("row expansion via \"*\" is not supported here"),
                     parser_errposition(pstate, location)));
        }
        else
        {
            FieldStore *fstore;
            Oid         baseTypeId;
            int32       baseTypeMod;
            Oid         typrelid;
            AttrNumber  attnum;
            Oid         fieldTypeId;
            int32       fieldTypMod;
            Oid         fieldCollation;
 
            Assert(IsA(n, String));
 
            /* process subscripts before this field selection */
            if (subscripts)
            {
                /* recurse, and then return because we're done */
                return transformAssignmentSubscripts(pstate,
                                                     basenode,
                                                     targetName,
                                                     targetTypeId,
                                                     targetTypMod,
                                                     targetCollation,
                                                     subscripts,
                                                     indirection,
                                                     i,
                                                     rhs,
                                                     ccontext,
                                                     location);
            }
 
            /* No subscripts, so can process field selection here */
 
            /*
             * Look up the composite type, accounting for possibility that
             * what we are given is a domain over composite.
             */
            baseTypeMod = targetTypMod;
            baseTypeId = getBaseTypeAndTypmod(targetTypeId, &baseTypeMod);
 
            typrelid = typeidTypeRelid(baseTypeId);
            if (!typrelid)
                ereport(ERROR,
                        (errcode(ERRCODE_DATATYPE_MISMATCH),
                         errmsg("cannot assign to field \"%s\" of column \"%s\" because its type %s is not a composite type",
                                strVal(n), targetName,
                                format_type_be(targetTypeId)),
                         parser_errposition(pstate, location)));
 
            attnum = get_attnum(typrelid, strVal(n));
            if (attnum == InvalidAttrNumber)
                ereport(ERROR,
                        (errcode(ERRCODE_UNDEFINED_COLUMN),
                         errmsg("cannot assign to field \"%s\" of column \"%s\" because there is no such column in data type %s",
                                strVal(n), targetName,
                                format_type_be(targetTypeId)),
                         parser_errposition(pstate, location)));
            if (attnum < 0)
                ereport(ERROR,
                        (errcode(ERRCODE_UNDEFINED_COLUMN),
                         errmsg("cannot assign to system column \"%s\"",
                                strVal(n)),
                         parser_errposition(pstate, location)));
 
            get_atttypetypmodcoll(typrelid, attnum,
                                  &fieldTypeId, &fieldTypMod, &fieldCollation);
 
            /* recurse to create appropriate RHS for field assign */
            rhs = transformAssignmentIndirection(pstate,
                                                 NULL,
                                                 strVal(n),
                                                 false,
                                                 fieldTypeId,
                                                 fieldTypMod,
                                                 fieldCollation,
                                                 indirection,
                                                 lnext(indirection, i),
                                                 rhs,
                                                 ccontext,
                                                 location);
 
            /* and build a FieldStore node */
            fstore = makeNode(FieldStore);
            fstore->arg = (Expr *) basenode;
            fstore->newvals = list_make1(rhs);
            fstore->fieldnums = list_make1_int(attnum);
            fstore->resulttype = baseTypeId;
 
            /*
             * If target is a domain, apply constraints.  Notice that this
             * isn't totally right: the expression tree we build would check
             * the domain's constraints on a composite value with only this
             * one field populated or updated, possibly leading to an unwanted
             * failure.  The rewriter will merge together any subfield
             * assignments to the same table column, resulting in the domain's
             * constraints being checked only once after we've assigned to all
             * the fields that the INSERT or UPDATE means to.
             */
            if (baseTypeId != targetTypeId)
                return coerce_to_domain((Node *) fstore,
                                        baseTypeId, baseTypeMod,
                                        targetTypeId,
                                        COERCION_IMPLICIT,
                                        COERCE_IMPLICIT_CAST,
                                        location,
                                        false);
 
            return (Node *) fstore;
        }
    }
 
    /* process trailing subscripts, if any */
    if (subscripts)
    {
        /* recurse, and then return because we're done */
        return transformAssignmentSubscripts(pstate,
                                             basenode,
                                             targetName,
                                             targetTypeId,
                                             targetTypMod,
                                             targetCollation,
                                             subscripts,
                                             indirection,
                                             NULL,
                                             rhs,
                                             ccontext,
                                             location);
    }
 
    /* base case: just coerce RHS to match target type ID */
 
    result = coerce_to_target_type(pstate,
                                   rhs, exprType(rhs),
                                   targetTypeId, targetTypMod,
                                   ccontext,
                                   COERCE_IMPLICIT_CAST,
                                   -1);
    if (result == NULL)
    {
        if (targetIsSubscripting)
            ereport(ERROR,
                    (errcode(ERRCODE_DATATYPE_MISMATCH),
                     errmsg("subscripted assignment to \"%s\" requires type %s"
                            " but expression is of type %s",
                            targetName,
                            format_type_be(targetTypeId),
                            format_type_be(exprType(rhs))),
                     errhint("You will need to rewrite or cast the expression."),
                     parser_errposition(pstate, location)));
        else
            ereport(ERROR,
                    (errcode(ERRCODE_DATATYPE_MISMATCH),
                     errmsg("subfield \"%s\" is of type %s"
                            " but expression is of type %s",
                            targetName,
                            format_type_be(targetTypeId),
                            format_type_be(exprType(rhs))),
                     errhint("You will need to rewrite or cast the expression."),
                     parser_errposition(pstate, location)));
    }
 
    return result;
}

References FieldStore::arg, Assert, attnum, COERCE_IMPLICIT_CAST, coerce_to_domain(), coerce_to_target_type(), COERCION_IMPLICIT, ereport, errcode(), errhint(), errmsg(), ERROR, exprType(), for_each_cell, format_type_be(), get_attnum(), get_atttypetypmodcoll(), getBaseTypeAndTypmod(), i, InvalidAttrNumber, IsA, lappend(), lfirst, list_make1, list_make1_int, lnext(), makeNode, FieldStore::newvals, NIL, parser_errposition(), strVal, transformAssignmentSubscripts(), CaseTestExpr::typeId, and typeidTypeRelid().

Referenced by transformAssignedExpr(), transformAssignmentSubscripts(), and transformPLAssignStmt().

transformExpressionList()

List* transformExpressionList	(	ParseState *	pstate,
		List *	exprlist,
		ParseExprKind	exprKind,
		bool	allowDefault
	)

Definition at line 220 of file parse_target.c.

{
    List       *result = NIL;
    ListCell   *lc;
 
    foreach(lc, exprlist)
    {
        Node       *e = (Node *) lfirst(lc);
 
        /*
         * Check for "something.*".  Depending on the complexity of the
         * "something", the star could appear as the last field in ColumnRef,
         * or as the last indirection item in A_Indirection.
         */
        if (IsA(e, ColumnRef))
        {
            ColumnRef  *cref = (ColumnRef *) e;
 
            if (IsA(llast(cref->fields), A_Star))
            {
                /* It is something.*, expand into multiple items */
                result = list_concat(result,
                                     ExpandColumnRefStar(pstate, cref,
                                                         false));
                continue;
            }
        }
        else if (IsA(e, A_Indirection))
        {
            A_Indirection *ind = (A_Indirection *) e;
 
            if (IsA(llast(ind->indirection), A_Star))
            {
                /* It is something.*, expand into multiple items */
                result = list_concat(result,
                                     ExpandIndirectionStar(pstate, ind,
                                                           false, exprKind));
                continue;
            }
        }
 
        /*
         * Not "something.*", so transform as a single expression.  If it's a
         * SetToDefault node and we should allow that, pass it through
         * unmodified.  (transformExpr will throw the appropriate error if
         * we're disallowing it.)
         */
        if (allowDefault && IsA(e, SetToDefault))
             /* do nothing */ ;
        else
            e = transformExpr(pstate, e, exprKind);
 
        result = lappend(result, e);
    }
 
    return result;
}

References ExpandColumnRefStar(), ExpandIndirectionStar(), ColumnRef::fields, IsA, lappend(), lfirst, list_concat(), llast, NIL, and transformExpr().

Referenced by transformMergeStmt(), transformRowExpr(), and transformValuesClause().

transformTargetEntry()

TargetEntry* transformTargetEntry	(	ParseState *	pstate,
		Node *	node,
		Node *	expr,
		ParseExprKind	exprKind,
		char *	colname,
		bool	resjunk
	)

Definition at line 75 of file parse_target.c.

{
    /* Transform the node if caller didn't do it already */
    if (expr == NULL)
    {
        /*
         * If it's a SetToDefault node and we should allow that, pass it
         * through unmodified.  (transformExpr will throw the appropriate
         * error if we're disallowing it.)
         */
        if (exprKind == EXPR_KIND_UPDATE_SOURCE && IsA(node, SetToDefault))
            expr = node;
        else
            expr = transformExpr(pstate, node, exprKind);
    }
 
    if (colname == NULL && !resjunk)
    {
        /*
         * Generate a suitable column name for a column without any explicit
         * 'AS ColumnName' clause.
         */
        colname = FigureColname(node);
    }
 
    return makeTargetEntry((Expr *) expr,
                           (AttrNumber) pstate->p_next_resno++,
                           colname,
                           resjunk);
}

References EXPR_KIND_UPDATE_SOURCE, FigureColname(), IsA, makeTargetEntry(), ParseState::p_next_resno, and transformExpr().

Referenced by findTargetlistEntrySQL99(), and transformTargetList().

transformTargetList()

List* transformTargetList	(	ParseState *	pstate,
		List *	targetlist,
		ParseExprKind	exprKind
	)

Definition at line 121 of file parse_target.c.

{
    List       *p_target = NIL;
    bool        expand_star;
    ListCell   *o_target;
 
    /* Shouldn't have any leftover multiassign items at start */
    Assert(pstate->p_multiassign_exprs == NIL);
 
    /* Expand "something.*" in SELECT and RETURNING, but not UPDATE */
    expand_star = (exprKind != EXPR_KIND_UPDATE_SOURCE);
 
    foreach(o_target, targetlist)
    {
        ResTarget  *res = (ResTarget *) lfirst(o_target);
 
        /*
         * Check for "something.*".  Depending on the complexity of the
         * "something", the star could appear as the last field in ColumnRef,
         * or as the last indirection item in A_Indirection.
         */
        if (expand_star)
        {
            if (IsA(res->val, ColumnRef))
            {
                ColumnRef  *cref = (ColumnRef *) res->val;
 
                if (IsA(llast(cref->fields), A_Star))
                {
                    /* It is something.*, expand into multiple items */
                    p_target = list_concat(p_target,
                                           ExpandColumnRefStar(pstate,
                                                               cref,
                                                               true));
                    continue;
                }
            }
            else if (IsA(res->val, A_Indirection))
            {
                A_Indirection *ind = (A_Indirection *) res->val;
 
                if (IsA(llast(ind->indirection), A_Star))
                {
                    /* It is something.*, expand into multiple items */
                    p_target = list_concat(p_target,
                                           ExpandIndirectionStar(pstate,
                                                                 ind,
                                                                 true,
                                                                 exprKind));
                    continue;
                }
            }
        }
 
        /*
         * Not "something.*", or we want to treat that as a plain whole-row
         * variable, so transform as a single expression
         */
        p_target = lappend(p_target,
                           transformTargetEntry(pstate,
                                                res->val,
                                                NULL,
                                                exprKind,
                                                res->name,
                                                false));
    }
 
    /*
     * If any multiassign resjunk items were created, attach them to the end
     * of the targetlist.  This should only happen in an UPDATE tlist.  We
     * don't need to worry about numbering of these items; transformUpdateStmt
     * will set their resnos.
     */
    if (pstate->p_multiassign_exprs)
    {
        Assert(exprKind == EXPR_KIND_UPDATE_SOURCE);
        p_target = list_concat(p_target, pstate->p_multiassign_exprs);
        pstate->p_multiassign_exprs = NIL;
    }
 
    return p_target;
}

References Assert, ExpandColumnRefStar(), ExpandIndirectionStar(), EXPR_KIND_UPDATE_SOURCE, ColumnRef::fields, if(), IsA, lappend(), lfirst, list_concat(), llast, NIL, ParseState::p_multiassign_exprs, res, and transformTargetEntry().

Referenced by transformPLAssignStmt(), transformReturningList(), transformSelectStmt(), and transformUpdateTargetList().

updateTargetListEntry()

void updateTargetListEntry	(	ParseState *	pstate,
		TargetEntry *	tle,
		char *	colname,
		int	attrno,
		List *	indirection,
		int	location
	)

Definition at line 619 of file parse_target.c.

{
    /* Fix up expression as needed */
    tle->expr = transformAssignedExpr(pstate,
                                      tle->expr,
                                      EXPR_KIND_UPDATE_TARGET,
                                      colname,
                                      attrno,
                                      indirection,
                                      location);
 
    /*
     * Set the resno to identify the target column --- the rewriter and
     * planner depend on this.  We also set the resname to identify the target
     * column, but this is only for debugging purposes; it should not be
     * relied on.  (In particular, it might be out of date in a stored rule.)
     */
    tle->resno = (AttrNumber) attrno;
    tle->resname = colname;
}

References TargetEntry::expr, EXPR_KIND_UPDATE_TARGET, TargetEntry::resno, and transformAssignedExpr().

Referenced by transformUpdateTargetList().