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Fix optimizer to not try to push WHERE clauses down into a sub-SELECT that

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has a DISTINCT ON clause, per bug report from Anthony Wood.  While at it,
improve the DISTINCT-ON-clause recognizer routine to not be fooled by out-
of-order DISTINCT lists.
This commit is contained in:
Tom Lane
2001-07-31 17:56:31 +00:00
parent 6fbf442d5a
commit 421467cdc8
4 changed files with 70 additions and 40 deletions
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4
src/include/optimizer/clauses.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: clauses.h,v 1.44 2001/05/20 20:28:20 tgl Exp $
* $Id: clauses.h,v 1.45 2001/07/31 17:56:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -51,6 +51,8 @@ extern bool contain_noncachable_functions(Node *clause);
extern bool is_pseudo_constant_clause(Node *clause);
extern List *pull_constant_clauses(List *quals, List **constantQual);
extern bool has_distinct_on_clause(Query *query);
extern void clause_get_relids_vars(Node *clause, Relids *relids, List **vars);
extern int NumRelids(Node *clause);
extern void CommuteClause(Expr *clause);