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Aggregate functions now support multiple input arguments. I also took

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the opportunity to treat COUNT(*) as a zero-argument aggregate instead
of the old hack that equated it to COUNT(1); this is materially cleaner
(no more weird ANYOID cases) and ought to be at least a tiny bit faster.
Original patch by Sergey Koposov; review, documentation, simple regression
tests, pg_dump and psql support by moi.
This commit is contained in:
Tom Lane
2006-07-27 19:52:07 +00:00
parent c2d1138351
commit 108fe47301
39 changed files with 702 additions and 484 deletions
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6
src/include/nodes/primnodes.h
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@@ -10,7 +10,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.114 2006/07/13 16:49:19 momjian Exp $
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.115 2006/07/27 19:52:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -184,9 +184,9 @@ typedef struct Aggref
Expr xpr;
Oid aggfnoid; /* pg_proc Oid of the aggregate */
Oid aggtype; /* type Oid of result of the aggregate */
Expr *target; /* expression we are aggregating on */
List *args; /* arguments to the aggregate */
Index agglevelsup; /* > 0 if agg belongs to outer query */
bool aggstar; /* TRUE if argument was really '*' */
bool aggstar; /* TRUE if argument list was really '*' */
bool aggdistinct; /* TRUE if it's agg(DISTINCT ...) */
} Aggref;