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Implementation of UNIONs.

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This commit is contained in:
Bruce Momjian
1997-12-24 06:06:58 +00:00
parent 18adbd9aed
commit 6231e161c9
7 changed files with 95 additions and 91 deletions
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30
src/backend/parser/analyze.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.55 1997/12/23 19:39:42 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.56 1997/12/24 06:06:18 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -821,18 +821,7 @@ transformSelectStmt(ParseState *pstate, RetrieveStmt *stmt)
/* fix where clause */
qry->qual = transformWhereClause(pstate, stmt->whereClause);
/* check subselect clause */
if (stmt->unionClause)
{
elog(NOTICE, "UNION not yet supported; using first SELECT only", NULL);
/* XXX HACK just playing with union clause - thomas 1997-12-19 */
if ((qry->uniqueFlag == NULL)
&& (! ((SubSelect *)lfirst(stmt->unionClause))->unionall))
qry->uniqueFlag = "*";
}
/* check subselect clause */
/* check having clause */
if (stmt->havingClause)
elog(NOTICE, "HAVING not yet supported; ignore clause", NULL);
@ -842,7 +831,6 @@ transformSelectStmt(ParseState *pstate, RetrieveStmt *stmt)
qry->targetList,
qry->uniqueFlag);
/* fix group by clause */
qry->groupClause = transformGroupClause(pstate,
stmt->groupClause,
qry->targetList);
@ -851,6 +839,20 @@ transformSelectStmt(ParseState *pstate, RetrieveStmt *stmt)
if (pstate->p_numAgg > 0)
finalizeAggregates(pstate, qry);
if (stmt->unionClause)
{
List *ulist = NIL;
QueryTreeList *qlist;
int i;
qlist = parse_analyze(stmt->unionClause);
for (i=0; i < qlist->len; i++)
ulist = lappend(ulist, qlist->qtrees[i]);
qry->unionClause = ulist;
}
else
qry->unionClause = NULL;
return (Query *) qry;
}