database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-17 06:41:09 +03:00
Code Activity

Back-patch fix for erroneous selectivity of not-equals.

Browse Source
This commit is contained in:
Tom Lane
2000-09-23 21:27:05 +00:00
parent 5a5531a3f4
commit 89ebadcd77
1 changed files with 17 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
src/backend/utils/adt/selfuncs.c
View File

@ -15,7 +15,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.66 2000/05/26 17:19:15 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.66.2.1 2000/09/23 21:27:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -255,9 +255,24 @@ neqsel(Oid opid,
Datum value,
int32 flag)
{
Oid eqopid;
float64 result;
result = eqsel(opid, relid, attno, value, flag);
/*
* We want 1 - eqsel() where the equality operator is the one associated
* with this != operator, that is, its negator.
*/
eqopid = get_negator(opid);
if (eqopid)
{
result = eqsel(eqopid, relid, attno, value, flag);
}
else
{
/* Use default selectivity (should we raise an error instead?) */
result = (float64) palloc(sizeof(float64data));
*result = DEFAULT_EQ_SEL;
}
*result = 1.0 - *result;
return result;
}