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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/tcop/pquery.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/pquery.c,v 1.36 2000/07/12 02:37:15 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/pquery.c,v 1.37 2000/07/17 03:05:15 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -19,8 +19,10 @@
#include "executor/execdefs.h"
#include "executor/executor.h"
#include "tcop/pquery.h"
#include "utils/memutils.h"
#include "utils/ps_status.h"
static char *CreateOperationTag(int operationType);