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Code cleanup inspired by recent resname bug report (doesn't fix the bug

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yet, though).  Avoid using nth() to fetch tlist entries; provide a
common routine get_tle_by_resno() to search a tlist for a particular
resno.  This replaces a couple uses of nth() and a dozen hand-coded
search loops.  Also, replace a few uses of nth(length-1, list) with
llast().
This commit is contained in:
Tom Lane
2003-08-11 20:46:47 +00:00
parent cae912d05b
commit 88381ade63
12 changed files with 161 additions and 316 deletions
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14
src/backend/optimizer/path/allpaths.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.106 2003/08/04 02:40:00 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.107 2003/08/11 20:46:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -726,8 +726,7 @@ qual_is_pushdown_safe(Query *subquery, Index rti, Node *qual,
foreach(vl, vars)
{
Var *var = (Var *) lfirst(vl);
List *tl;
TargetEntry *tle = NULL;
TargetEntry *tle;
Assert(var->varno == rti);
@ -748,13 +747,8 @@ qual_is_pushdown_safe(Query *subquery, Index rti, Node *qual,
}
/* Must find the tlist element referenced by the Var */
foreach(tl, subquery->targetList)
{
tle = (TargetEntry *) lfirst(tl);
if (tle->resdom->resno == var->varattno)
break;
}
Assert(tl != NIL);
tle = get_tle_by_resno(subquery->targetList, var->varattno);
Assert(tle != NULL);
Assert(!tle->resdom->resjunk);
/* If subquery uses DISTINCT or DISTINCT ON, check point 3 */