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Fix: Operand Order Affects OR. 

where x <> 1 or x isnull
didn't return tuples with x NULL.
This commit is contained in:
Vadim B. Mikheev 1997-09-22 04:19:36 +00:00
parent c2c26b6ff0
commit e7046924a5
1 changed files with 16 additions and 1 deletions
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17
src/backend/executor/execQual.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.17 1997/09/12 04:07:36 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/execQual.c,v 1.18 1997/09/22 04:19:36 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -1044,7 +1044,22 @@ ExecEvalOr(Expr *orExpr, ExprContext *econtext, bool *isNull)
* ----------------
*/
if (*isNull)
{
IsNull = *isNull;
/*
* Many functions don't (or can't!) check is an argument
* NULL or NOT_NULL and may return TRUE (1) with *isNull TRUE
* (an_int4_column <> 1: int4ne returns TRUE for NULLs).
* Not having time to fix function manager I want to fix
* OR: if we had 'x <> 1 OR x isnull' then TRUE, TRUE were
* returned by 'x <> 1' for NULL ... but ExecQualClause say
* that qualification *fails* if isnull is TRUE for all values
* returned by ExecEvalExpr. So, force this rule here: if isnull
* is TRUE then clause failed. Note: nullvalue() & nonnullvalue()
* always set isnull to FALSE for NULLs. - vadim 09/22/97
*/
const_value = 0;
}
/* ----------------
* if we have a true result, then we return it.