database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-27 00:12:01 +03:00
Code Activity

Improve UniquePath logic to detect the case where the input is already

Browse Source 
known unique (eg, it is a SELECT DISTINCT ... subquery), and not do a
redundant unique-ification step.
This commit is contained in:
Tom Lane
2004-01-05 18:04:39 +00:00
parent cce442da6d
commit 5c74ce23db
6 changed files with 72 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
src/include/optimizer/clauses.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.71 2004/01/04 03:51:52 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.72 2004/01/05 18:04:39 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -57,6 +57,7 @@ extern bool is_pseudo_constant_clause(Node *clause);
extern bool is_pseudo_constant_clause_relids(Node *clause, Relids relids);
extern List *pull_constant_clauses(List *quals, List **constantQual);
extern bool has_distinct_clause(Query *query);
extern bool has_distinct_on_clause(Query *query);
extern int NumRelids(Node *clause);