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Add IS UNKNOWN, IS NOT UNKNOWN boolean tests, fix the existing boolean

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tests to return the correct results per SQL9x when given NULL inputs.
Reimplement these tests as well as IS [NOT] NULL to have their own
expression node types, instead of depending on special functions.
From Joe Conway, with a little help from Tom Lane.
This commit is contained in:
Tom Lane
2001-06-19 22:39:12 +00:00
parent 8c30aca2ba
commit 116d2bba7e
18 changed files with 666 additions and 153 deletions
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28
src/backend/nodes/equalfuncs.c
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@@ -20,7 +20,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.92 2001/06/09 23:21:54 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.93 2001/06/19 22:39:11 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1712,6 +1712,26 @@ _equalCaseWhen(CaseWhen *a, CaseWhen *b)
return true;
}
static bool
_equalNullTest(NullTest *a, NullTest *b)
{
if (!equal(a->arg, b->arg))
return false;
if (a->nulltesttype != b->nulltesttype)
return false;
return true;
}
static bool
_equalBooleanTest(BooleanTest *a, BooleanTest *b)
{
if (!equal(a->arg, b->arg))
return false;
if (a->booltesttype != b->booltesttype)
return false;
return true;
}
/*
* Stuff from pg_list.h
*/
@@ -2120,6 +2140,12 @@ equal(void *a, void *b)
case T_CaseWhen:
retval = _equalCaseWhen(a, b);
break;
case T_NullTest:
retval = _equalNullTest(a, b);
break;
case T_BooleanTest:
retval = _equalBooleanTest(a, b);
break;
case T_FkConstraint:
retval = _equalFkConstraint(a, b);
break;