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Rip out QueryTreeList structure, root and branch. Querytree

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lists are now plain old garden-variety Lists, allocated with palloc,
rather than specialized expansible-array data allocated with malloc.
This substantially simplifies their handling and eliminates several
sources of memory leakage.
Several basic types of erroneous queries (syntax error, attempt to
insert a duplicate key into a unique index) now demonstrably leak
zero bytes per query.
This commit is contained in:
Tom Lane
1999-05-13 07:29:22 +00:00
parent f80642137c
commit 507a0a2ab0
18 changed files with 192 additions and 288 deletions
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15
src/backend/parser/parse_clause.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_clause.c,v 1.30 1999/05/12 15:01:50 wieck Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_clause.c,v 1.31 1999/05/13 07:28:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -752,23 +752,24 @@ List *
transformUnionClause(List *unionClause, List *targetlist)
{
List *union_list = NIL;
QueryTreeList *qlist;
int i;
List *qlist,
*qlist_item;
if (unionClause)
{
/* recursion */
qlist = parse_analyze(unionClause, NULL);
for (i = 0; i < qlist->len; i++)
foreach (qlist_item, qlist)
{
Query *query = (Query *) lfirst(qlist_item);
List *prev_target = targetlist;
List *next_target;
if (length(targetlist) != length(qlist->qtrees[i]->targetList))
if (length(targetlist) != length(query->targetList))
elog(ERROR, "Each UNION clause must have the same number of columns");
foreach(next_target, qlist->qtrees[i]->targetList)
foreach(next_target, query->targetList)
{
Oid itype;
Oid otype;
@ -819,7 +820,7 @@ transformUnionClause(List *unionClause, List *targetlist)
}
prev_target = lnext(prev_target);
}
union_list = lappend(union_list, qlist->qtrees[i]);
union_list = lappend(union_list, query);
}
return union_list;
}