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Clean up handling of variable-free qual clauses. System now does the

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right thing with variable-free clauses that contain noncachable functions,
such as 'WHERE random() < 0.5' --- these are evaluated once per
potential output tuple.  Expressions that contain only Params are
now candidates to be indexscan quals --- for example, 'var = ($1 + 1)'
can now be indexed.  Cope with RelabelType nodes atop potential indexscan
variables --- this oversight prevents 7.0.* from recognizing some
potentially indexscanable situations.
This commit is contained in:
Tom Lane
2000-08-13 02:50:35 +00:00
parent 766fb7f707
commit 37168b8da4
15 changed files with 410 additions and 177 deletions
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4
src/backend/executor/execProcnode.c
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@ -12,7 +12,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/execProcnode.c,v 1.18 2000/01/26 05:56:21 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/execProcnode.c,v 1.19 2000/08/13 02:50:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -277,7 +277,7 @@ ExecProcNode(Plan *node, Plan *parent)
* ----------------
*/
case T_NestLoop:
result = ExecNestLoop((NestLoop *) node, parent);
result = ExecNestLoop((NestLoop *) node);
break;
case T_MergeJoin: