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Revise aggregate functions per earlier discussions in pghackers.

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There's now only one transition value and transition function.
NULL handling in aggregates is a lot cleaner.  Also, use Numeric
accumulators instead of integer accumulators for sum/avg on integer
datatypes --- this avoids overflow at the cost of being a little slower.
Implement VARIANCE() and STDDEV() aggregates in the standard backend.

Also, enable new LIKE selectivity estimators by default.  Unrelated
change, but as long as I had to force initdb anyway...
This commit is contained in:
Tom Lane
2000-07-17 03:05:41 +00:00
parent 139f19c302
commit bec98a31c5
55 changed files with 1949 additions and 1813 deletions
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4
src/backend/nodes/equalfuncs.c
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@@ -24,7 +24,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.68 2000/07/12 02:37:04 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.69 2000/07/17 03:05:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -257,8 +257,6 @@ _equalAggref(Aggref *a, Aggref *b)
return false;
if (!equal(a->target, b->target))
return false;
if (a->usenulls != b->usenulls)
return false;
if (a->aggstar != b->aggstar)
return false;
if (a->aggdistinct != b->aggdistinct)