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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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44
src/backend/nodes/copyfuncs.c
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@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.144 2001/06/09 23:21:54 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.145 2001/06/19 22:39:11 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1017,6 +1017,42 @@ _copyCaseWhen(CaseWhen *from)
return newnode;
}
/* ----------------
* _copyNullTest
* ----------------
*/
static NullTest *
_copyNullTest(NullTest *from)
{
NullTest *newnode = makeNode(NullTest);
/*
* copy remainder of node
*/
Node_Copy(from, newnode, arg);
newnode->nulltesttype = from->nulltesttype;
return newnode;
}
/* ----------------
* _copyBooleanTest
* ----------------
*/
static BooleanTest *
_copyBooleanTest(BooleanTest *from)
{
BooleanTest *newnode = makeNode(BooleanTest);
/*
* copy remainder of node
*/
Node_Copy(from, newnode, arg);
newnode->booltesttype = from->booltesttype;
return newnode;
}
static ArrayRef *
_copyArrayRef(ArrayRef *from)
{
@ -2954,6 +2990,12 @@ copyObject(void *from)
case T_CaseWhen:
retval = _copyCaseWhen(from);
break;
case T_NullTest:
retval = _copyNullTest(from);
break;
case T_BooleanTest:
retval = _copyBooleanTest(from);
break;
case T_FkConstraint:
retval = _copyFkConstraint(from);
break;