database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-19 23:22:23 +03:00
Code Activity

Fix another place that wasn't maintaining AND/OR flatness of an

Browse Source 
already-canonicalized qual expression.
This commit is contained in:
Tom Lane
2004-01-12 22:20:28 +00:00
parent 5590be0a9e
commit 67af5bace5
2 changed files with 65 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
src/backend/optimizer/plan/subselect.c
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.86 2003/11/29 19:51:50 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.87 2004/01/12 22:20:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -848,13 +848,58 @@ process_sublinks_mutator(Node *node, bool *isTopQual)
Assert(!IsA(node, Query));
/*
* If we recurse down through anything other than a List node, we are
* definitely not at top qual level anymore.
* Because make_subplan() could return an AND or OR clause, we have to
* take steps to preserve AND/OR flatness of a qual. We assume the input
* has been AND/OR flattened and so we need no recursion here.
*
* If we recurse down through anything other than an AND node,
* we are definitely not at top qual level anymore. (Due to the coding
* here, we will not get called on the List subnodes of an AND, so no
* check is needed for List.)
*/
if (IsA(node, List))
if (and_clause(node))
{
List *newargs = NIL;
List *l;
/* Still at qual top-level */
locTopQual = *isTopQual;
else
locTopQual = false;
foreach(l, ((BoolExpr *) node)->args)
{
Node *newarg;
newarg = process_sublinks_mutator(lfirst(l),
(void *) &locTopQual);
if (and_clause(newarg))
newargs = nconc(newargs, ((BoolExpr *) newarg)->args);
else
newargs = lappend(newargs, newarg);
}
return (Node *) make_andclause(newargs);
}
/* otherwise not at qual top-level */
locTopQual = false;
if (or_clause(node))
{
List *newargs = NIL;
List *l;
foreach(l, ((BoolExpr *) node)->args)
{
Node *newarg;
newarg = process_sublinks_mutator(lfirst(l),
(void *) &locTopQual);
if (or_clause(newarg))
newargs = nconc(newargs, ((BoolExpr *) newarg)->args);
else
newargs = lappend(newargs, newarg);
}
return (Node *) make_orclause(newargs);
}
return expression_tree_mutator(node,
process_sublinks_mutator,