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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/include/executor/nodeNestloop.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: nodeNestloop.h,v 1.12 2000/01/26 05:58:05 momjian Exp $
* $Id: nodeNestloop.h,v 1.13 2000/08/13 02:50:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,7 +16,7 @@
#include "nodes/plannodes.h"
extern TupleTableSlot *ExecNestLoop(NestLoop *node, Plan *parent);
extern TupleTableSlot *ExecNestLoop(NestLoop *node);
extern bool ExecInitNestLoop(NestLoop *node, EState *estate, Plan *parent);
extern int ExecCountSlotsNestLoop(NestLoop *node);
extern void ExecEndNestLoop(NestLoop *node);