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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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41
src/backend/nodes/outfuncs.c
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@@ -5,7 +5,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.141 2001/05/20 20:28:18 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.142 2001/06/19 22:39:11 tgl Exp $
*
* NOTES
* Every (plan) node in POSTGRES has an associated "out" routine which
@@ -1259,12 +1259,6 @@ _outAExpr(StringInfo str, A_Expr *node)
case NOT:
appendStringInfo(str, "NOT ");
break;
case ISNULL:
appendStringInfo(str, "ISNULL ");
break;
case NOTNULL:
appendStringInfo(str, "NOTNULL ");
break;
case OP:
_outToken(str, node->opname);
appendStringInfo(str, " ");
@@ -1402,6 +1396,32 @@ _outCaseWhen(StringInfo str, CaseWhen *node)
_outNode(str, node->result);
}
/*
* NullTest
*/
static void
_outNullTest(StringInfo str, NullTest *node)
{
appendStringInfo(str, " NULLTEST :arg ");
_outNode(str, node->arg);
appendStringInfo(str, " :nulltesttype %d ",
(int) node->nulltesttype);
}
/*
* BooleanTest
*/
static void
_outBooleanTest(StringInfo str, BooleanTest *node)
{
appendStringInfo(str, " BOOLEANTEST :arg ");
_outNode(str, node->arg);
appendStringInfo(str, " :booltesttype %d ",
(int) node->booltesttype);
}
/*
* _outNode -
* converts a Node into ascii string and append it to 'str'
@@ -1639,7 +1659,12 @@ _outNode(StringInfo str, void *obj)
case T_CaseWhen:
_outCaseWhen(str, obj);
break;
case T_NullTest:
_outNullTest(str, obj);
break;
case T_BooleanTest:
_outBooleanTest(str, obj);
break;
case T_VariableSetStmt:
break;
case T_SelectStmt: