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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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56
src/backend/nodes/readfuncs.c
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@ -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);