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Change scoping of table and join refnames to conform to SQL92: a JOIN

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clause with an alias is a <subquery> and therefore hides table references
appearing within it, according to the spec.  This is the same as the
preliminary patch I posted to pgsql-patches yesterday, plus some really
grotty code in ruleutils.c to reverse-list a query tree with the correct
alias name depending on context.  I'd rather not have done that, but unless
we want to force another initdb for 7.1, there's no other way for now.
This commit is contained in:
Tom Lane
2001-02-14 21:35:07 +00:00
parent d42d31e78e
commit 4a66f9dd54
16 changed files with 853 additions and 501 deletions
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27
src/backend/parser/parse_func.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.98 2001/01/24 19:43:02 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.99 2001/02/14 21:35:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -427,6 +427,7 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
{
RangeTblEntry *rte;
int vnum;
Node *rteorjoin;
int sublevels_up;
/*
@ -434,9 +435,29 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
*/
refname = ((Ident *) arg)->name;
rte = refnameRangeTableEntry(pstate, refname);
if (rte == NULL)
rteorjoin = refnameRangeOrJoinEntry(pstate, refname,
&sublevels_up);
if (rteorjoin == NULL)
{
rte = addImplicitRTE(pstate, refname);
}
else if (IsA(rteorjoin, RangeTblEntry))
{
rte = (RangeTblEntry *) rteorjoin;
}
else if (IsA(rteorjoin, JoinExpr))
{
elog(ERROR,
"function applied to tuple is not supported for joins");
rte = NULL; /* keep compiler quiet */
}
else
{
elog(ERROR, "ParseFuncOrColumn: unexpected node type %d",
nodeTag(rteorjoin));
rte = NULL; /* keep compiler quiet */
}
vnum = RTERangeTablePosn(pstate, rte, &sublevels_up);