diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2009-12-15 17:57:48 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2009-12-15 17:57:48 +0000 |
| commit | 34d26872ed816b299eef2fa4240d55316697f42d (patch) | |
| tree | d7373e29b365c151702c44325f0f5cc9dcc3e17c /src/include/parser/parse_clause.h | |
| parent | 6a6efb964092902bf53965649c3ed78b1868b37e (diff) | |
| download | postgresql-34d26872ed816b299eef2fa4240d55316697f42d.tar.gz | |
Support ORDER BY within aggregate function calls, at long last providing a
non-kluge method for controlling the order in which values are fed to an
aggregate function. At the same time eliminate the old implementation
restriction that DISTINCT was only supported for single-argument aggregates.
Possibly release-notable behavioral change: formerly, agg(DISTINCT x)
dropped null values of x unconditionally. Now, it does so only if the
agg transition function is strict; otherwise nulls are treated as DISTINCT
normally would, ie, you get one copy.
Andrew Gierth, reviewed by Hitoshi Harada
Diffstat (limited to 'src/include/parser/parse_clause.h')
| -rw-r--r-- | src/include/parser/parse_clause.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/include/parser/parse_clause.h b/src/include/parser/parse_clause.h index 6bfb021f86..1989b3e4e4 100644 --- a/src/include/parser/parse_clause.h +++ b/src/include/parser/parse_clause.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/parser/parse_clause.h,v 1.56 2009/08/27 20:08:02 tgl Exp $ + * $PostgreSQL: pgsql/src/include/parser/parse_clause.h,v 1.57 2009/12/15 17:57:47 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -28,16 +28,16 @@ extern Node *transformLimitClause(ParseState *pstate, Node *clause, const char *constructName); extern List *transformGroupClause(ParseState *pstate, List *grouplist, List **targetlist, List *sortClause, - bool isWindowFunc); + bool useSQL99); extern List *transformSortClause(ParseState *pstate, List *orderlist, - List **targetlist, bool resolveUnknown, bool isWindowFunc); + List **targetlist, bool resolveUnknown, bool useSQL99); extern List *transformWindowDefinitions(ParseState *pstate, List *windowdefs, List **targetlist); extern List *transformDistinctClause(ParseState *pstate, - List **targetlist, List *sortClause); + List **targetlist, List *sortClause, bool is_agg); extern List *transformDistinctOnClause(ParseState *pstate, List *distinctlist, List **targetlist, List *sortClause); |