database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-18 04:29:09 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

76
src/backend/utils/adt/ruleutils.c
View File

@@ -3,7 +3,7 @@
* back to source text
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.77 2001/04/18 17:04:24 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.78 2001/06/19 22:39:12 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@@ -52,7 +52,6 @@
#include "parser/parse_expr.h"
#include "parser/parsetree.h"
#include "rewrite/rewriteManip.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
@@ -1948,6 +1947,60 @@ get_rule_expr(Node *node, deparse_context *context)
}
break;
case T_NullTest:
{
NullTest *ntest = (NullTest *) node;
appendStringInfo(buf, "((");
get_rule_expr(ntest->arg, context);
switch (ntest->nulltesttype)
{
case IS_NULL:
appendStringInfo(buf, ") IS NULL)");
break;
case IS_NOT_NULL:
appendStringInfo(buf, ") IS NOT NULL)");
break;
default:
elog(ERROR, "get_rule_expr: unexpected nulltesttype %d",
(int) ntest->nulltesttype);
}
}
break;
case T_BooleanTest:
{
BooleanTest *btest = (BooleanTest *) node;
appendStringInfo(buf, "((");
get_rule_expr(btest->arg, context);
switch (btest->booltesttype)
{
case IS_TRUE:
appendStringInfo(buf, ") IS TRUE)");
break;
case IS_NOT_TRUE:
appendStringInfo(buf, ") IS NOT TRUE)");
break;
case IS_FALSE:
appendStringInfo(buf, ") IS FALSE)");
break;
case IS_NOT_FALSE:
appendStringInfo(buf, ") IS NOT FALSE)");
break;
case IS_UNKNOWN:
appendStringInfo(buf, ") IS UNKNOWN)");
break;
case IS_NOT_UNKNOWN:
appendStringInfo(buf, ") IS NOT UNKNOWN)");
break;
default:
elog(ERROR, "get_rule_expr: unexpected booltesttype %d",
(int) btest->booltesttype);
}
}
break;
case T_SubLink:
get_sublink_expr(node, context);
break;
@@ -1978,25 +2031,6 @@ get_func_expr(Expr *expr, deparse_context *context)
List *l;
char *sep;
/*
* nullvalue() and nonnullvalue() should get turned into special
* syntax
*/
if (funcoid == F_NULLVALUE)
{
appendStringInfoChar(buf, '(');
get_rule_expr((Node *) lfirst(expr->args), context);
appendStringInfo(buf, " ISNULL)");
return;
}
if (funcoid == F_NONNULLVALUE)
{
appendStringInfoChar(buf, '(');
get_rule_expr((Node *) lfirst(expr->args), context);
appendStringInfo(buf, " NOTNULL)");
return;
}
/*
* Get the functions pg_proc tuple
*/