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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/libpq/be-fsstubs.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/libpq/be-fsstubs.c,v 1.49 2000/07/07 21:12:53 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/libpq/be-fsstubs.c,v 1.50 2000/07/17 03:04:54 tgl Exp $
*
* NOTES
* This should be moved to a more appropriate place. It is here
@@ -43,6 +43,8 @@
#include "libpq/be-fsstubs.h"
#include "libpq/libpq-fs.h"
#include "storage/large_object.h"
#include "utils/memutils.h"
/* [PA] is Pascal Andr<64> <andre@via.ecp.fr> */