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Cause GROUP BY clause to adopt ordering operators from ORDER BY when

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both clauses specify the same targets, rather than always using the
default ordering operator.  This allows 'GROUP BY foo ORDER BY foo DESC'
to be done with only one sort step.
This commit is contained in:
Tom Lane
2003-06-15 16:42:08 +00:00
parent da78e3e2eb
commit 996fdb9af1
3 changed files with 43 additions and 17 deletions
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15
src/backend/parser/analyze.c
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.273 2003/06/06 15:04:02 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.274 2003/06/15 16:42:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1787,14 +1787,19 @@ transformSelectStmt(ParseState *pstate, SelectStmt *stmt)
*/
qry->havingQual = transformWhereClause(pstate, stmt->havingClause);
qry->groupClause = transformGroupClause(pstate,
stmt->groupClause,
qry->targetList);
/*
* Transform sorting/grouping stuff. Do ORDER BY first because both
* transformGroupClause and transformDistinctClause need the results.
*/
qry->sortClause = transformSortClause(pstate,
stmt->sortClause,
qry->targetList);
qry->groupClause = transformGroupClause(pstate,
stmt->groupClause,
qry->targetList,
qry->sortClause);
qry->distinctClause = transformDistinctClause(pstate,
stmt->distinctClause,
qry->targetList,