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Patches for Vadim's multikey indexing...

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This commit is contained in:
Marc G. Fournier
1997-03-18 18:41:37 +00:00
parent c3d637ac3a
commit d146305065
9 changed files with 418 additions and 252 deletions
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31
src/backend/optimizer/plan/createplan.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.8 1997/03/12 21:05:56 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.9 1997/03/18 18:40:05 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@ -417,22 +417,35 @@ create_nestloop_node(JoinPath *best_path,
NestLoop *join_node = (NestLoop*)NULL;
if (IsA(inner_node,IndexScan)) {
/* An index is being used to reduce the number of tuples scanned in
* the inner relation.
* There will never be more than one index used in the inner
* scan path, so we need only consider the first set of
* qualifications in indxqual.
/* An index is being used to reduce the number of tuples scanned in
* the inner relation. There will never be more than one index used
* in the inner scan path, so we need only consider the first set of
* qualifications in indxqual.
*
* But there may be more than one clauses in this "first set"
* in the case of multi-column indices. - vadim 03/18/97
*/
List *inner_indxqual = lfirst(((IndexScan*)inner_node)->indxqual);
List *inner_qual = (inner_indxqual == NULL)? NULL:lfirst(inner_indxqual);
List *inner_qual;
bool found = false;
foreach (inner_qual, inner_indxqual)
{
if ( !(qual_clause_p ((Node*)inner_qual)) )
{
found = true;
break;
}
}
/* If we have in fact found a join index qualification, remove these
* index clauses from the nestloop's join clauses and reset the
* inner(index) scan's qualification so that the var nodes refer to
* the proper outer join relation attributes.
*/
if (!(qual_clause_p((Node*)inner_qual))) {
if ( found )
{
List *new_inner_qual = NIL;
clauses = set_difference(clauses,inner_indxqual);
@ -613,7 +626,7 @@ fix_indxqual_references(Node *clause, Path *index_path)
if (lfirsti(index_path->parent->relids) == ((Var*)clause)->varno) {
int pos = 0;
int varatt = ((Var*)clause)->varattno;
int *indexkeys = index_path->parent->indexkeys;
int *indexkeys = ((IndexPath*)index_path)->indexkeys;
if (indexkeys) {
while (indexkeys[pos] != 0) {