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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/executor/nodeHash.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* $Id: nodeHash.c,v 1.49 2000/07/12 02:37:03 tgl Exp $
* $Id: nodeHash.c,v 1.50 2000/07/17 03:04:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -30,6 +30,8 @@
#include "miscadmin.h"
#include "parser/parse_expr.h"
#include "parser/parse_type.h"
#include "utils/memutils.h"
static int hashFunc(Datum key, int len, bool byVal);