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Code

Fix for EXISTS.

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This commit is contained in:
Vadim B. Mikheev 1998-02-13 03:41:23 +00:00
parent e51c674c59
commit 7fab67a8ac
1 changed files with 21 additions and 17 deletions
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38
src/backend/parser/parse_expr.c
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@ -7,7 +7,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_expr.c,v 1.19 1998/02/10 16:03:28 momjian Exp $ * $Header: /cvsroot/pgsql/src/backend/parser/parse_expr.c,v 1.20 1998/02/13 03:41:23 vadim Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -245,39 +245,43 @@ transformExpr(ParseState *pstate, Node *expr, int precedence)
List *llist; List *llist;
pstate->p_hasSubLinks = true; pstate->p_hasSubLinks = true;
qtree = parse_analyze(lcons(sublink->subselect,NIL), pstate); qtree = parse_analyze(lcons(sublink->subselect,NIL), pstate);
Assert(qtree->len == 1); if (qtree->len != 1 ||
qtree->qtrees[0]->commandType != CMD_SELECT ||
qtree->qtrees[0]->resultRelation != 0 )
elog (ERROR, "parser: bad query in subselect");
sublink->subselect = (Node *) qtree->qtrees[0]; sublink->subselect = (Node *) qtree->qtrees[0];
foreach(llist, sublink->lefthand)
lfirst(llist) = transformExpr(pstate, lfirst(llist), precedence);
if (length(sublink->lefthand) !=
length(((Query *)sublink->subselect)->targetList))
elog(ERROR,"Subselect has too many or too few fields.");
if (sublink->subLinkType != EXISTS_SUBLINK) if (sublink->subLinkType != EXISTS_SUBLINK)
{ {
char *op = lfirst(sublink->oper); char *op = lfirst(sublink->oper);
List *left_expr = sublink->lefthand; List *left_expr = sublink->lefthand;
List *right_expr = ((Query *)sublink->subselect)->targetList; List *right_expr = ((Query*) sublink->subselect)->targetList;
List *elist; List *elist;
foreach(llist, left_expr)
lfirst(llist) = transformExpr(pstate, lfirst(llist), precedence);
if (length(left_expr) !=
length(right_expr))
elog(ERROR,"Subselect has too many or too few fields.");
sublink->oper = NIL; sublink->oper = NIL;
foreach(elist, left_expr) foreach(elist, left_expr)
{ {
Node *lexpr = lfirst(elist); Node *lexpr = lfirst(elist);
Node *rexpr = lfirst(right_expr); Node *rexpr = lfirst(right_expr);
TargetEntry *tent = (TargetEntry *)rexpr; TargetEntry *tent = (TargetEntry *)rexpr;
Expr *op_expr; Expr *op_expr;
op_expr = make_op(op, lexpr, tent->expr); op_expr = make_op(op, lexpr, tent->expr);
sublink->oper = lappend(sublink->oper, op_expr->oper); sublink->oper = lappend(sublink->oper, op_expr);
right_expr = lnext(right_expr); right_expr = lnext(right_expr);
} }
result = (Node *) expr;
} }
else
sublink->oper = NIL;
result = (Node *) expr;
break; break;
} }
default: default: