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

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

View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.110 2001/06/05 05:26:04 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.111 2001/06/19 22:39:11 tgl Exp $
*
* NOTES
* Most of the read functions for plan nodes are tested. (In fact, they
@ -859,6 +859,56 @@ _readCaseWhen(void)
return local_node;
}
/* ----------------
* _readNullTest
*
* NullTest is a subclass of Node
* ----------------
*/
static NullTest *
_readNullTest(void)
{
NullTest *local_node;
char *token;
int length;
local_node = makeNode(NullTest);
token = pg_strtok(&length); /* eat :arg */
local_node->arg = nodeRead(true); /* now read it */
token = pg_strtok(&length); /* eat :nulltesttype */
token = pg_strtok(&length); /* get nulltesttype */
local_node->nulltesttype = (NullTestType) atoi(token);
return local_node;
}
/* ----------------
* _readBooleanTest
*
* BooleanTest is a subclass of Node
* ----------------
*/
static BooleanTest *
_readBooleanTest(void)
{
BooleanTest *local_node;
char *token;
int length;
local_node = makeNode(BooleanTest);
token = pg_strtok(&length); /* eat :arg */
local_node->arg = nodeRead(true); /* now read it */
token = pg_strtok(&length); /* eat :booltesttype */
token = pg_strtok(&length); /* get booltesttype */
local_node->booltesttype = (BoolTestType) atoi(token);
return local_node;
}
/* ----------------
* _readVar
*
@ -1966,6 +2016,10 @@ parsePlanString(void)
return_value = _readCaseExpr();
else if (length == 4 && strncmp(token, "WHEN", length) == 0)
return_value = _readCaseWhen();
else if (length == 8 && strncmp(token, "NULLTEST", length) == 0)
return_value = _readNullTest();
else if (length == 11 && strncmp(token, "BOOLEANTEST", length) == 0)
return_value = _readBooleanTest();
else
elog(ERROR, "badly formatted planstring \"%.10s\"...", token);