database/postgres
database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-05-17 06:41:24 +03:00
Code

Fix merging pathes of pruned rels ("indices are unused" problem).

Browse Source
This commit is contained in:
Vadim B. Mikheev 1998-04-02 07:27:15 +00:00
parent 91964bd984
commit bb80f8a918
1 changed files with 11 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
src/backend/optimizer/path/prune.c
View File

@ -7,7 +7,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/Attic/prune.c,v 1.12 1998/02/26 04:32:43 momjian Exp $ * $Header: /cvsroot/pgsql/src/backend/optimizer/path/Attic/prune.c,v 1.13 1998/04/02 07:27:15 vadim Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -61,39 +61,25 @@ prune_joinrels(List *rel_list)
static List * static List *
prune_joinrel(Rel *rel, List *other_rels) prune_joinrel(Rel *rel, List *other_rels)
{ {
List *cur = NIL; List *i = NIL;
List *return_list = NIL; List *result = NIL;
/* find first relation that doesn't match */ foreach(i, other_rels)
foreach(cur, other_rels)
{ {
Rel *other_rel = (Rel *) lfirst(cur); Rel *other_rel = (Rel *) lfirst(i);
if (!same(rel->relids, other_rel->relids))
break;
}
/* we now know cur doesn't match, or is NIL */
return_list = cur;
/*
* remove relations that do match, we use lnext so we can remove
* easily
*/
while (cur != NIL && lnext(cur) != NIL)
{
Rel *other_rel = (Rel *) lfirst(lnext(cur));
if (same(rel->relids, other_rel->relids)) if (same(rel->relids, other_rel->relids))
{ {
rel->pathlist = add_pathlist(rel, rel->pathlist = add_pathlist(rel,
rel->pathlist, rel->pathlist,
other_rel->pathlist); other_rel->pathlist);
lnext(cur) = lnext(lnext(cur)); /* delete it */
} }
cur = lnext(cur); else
{
result = nconc(result, lcons(other_rel, NIL));
}
} }
return return_list; return (result);
} }
/* /*