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Fix parser so that we don't modify the user-written ORDER BY list in order

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to represent DISTINCT or DISTINCT ON.  This gets rid of a longstanding
annoyance that a view or rule using SELECT DISTINCT will be dumped out
with an overspecified ORDER BY list, and is one small step along the way
to decoupling DISTINCT and ORDER BY enough so that hash-based implementation
of DISTINCT will be possible.  In passing, improve transformDistinctClause
so that it doesn't reject duplicate DISTINCT ON items, as was reported by
Steve Midgley a couple weeks ago.
This commit is contained in:
Tom Lane
2008-07-31 22:47:56 +00:00
parent b1fb3b2a7f
commit 63247bec28
7 changed files with 174 additions and 125 deletions
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7
src/include/parser/parse_clause.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/parser/parse_clause.h,v 1.49 2008/01/01 19:45:58 momjian Exp $
* $PostgreSQL: pgsql/src/include/parser/parse_clause.h,v 1.50 2008/07/31 22:47:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -31,11 +31,8 @@ extern List *transformGroupClause(ParseState *pstate, List *grouplist,
extern List *transformSortClause(ParseState *pstate, List *orderlist,
List **targetlist, bool resolveUnknown);
extern List *transformDistinctClause(ParseState *pstate, List *distinctlist,
List **targetlist, List **sortClause);
List **targetlist, List *sortClause);
extern List *addAllTargetsToSortList(ParseState *pstate,
List *sortlist, List *targetlist,
bool resolveUnknown);
extern List *addTargetToSortList(ParseState *pstate, TargetEntry *tle,
List *sortlist, List *targetlist,
SortByDir sortby_dir, SortByNulls sortby_nulls,