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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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26
src/backend/parser/parse_coerce.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_coerce.c,v 2.57 2001/05/22 16:37:16 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_coerce.c,v 2.58 2001/06/19 22:39:11 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -321,6 +321,30 @@ coerce_type_typmod(ParseState *pstate, Node *node,
}
/* coerce_to_boolean()
* Coerce an argument of a construct that requires boolean input
* (AND, OR, NOT, etc).
*
* If successful, update *pnode to be the transformed argument (if any
* transformation is needed), and return TRUE. If fail, return FALSE.
* (The caller must check for FALSE and emit a suitable error message.)
*/
bool
coerce_to_boolean(ParseState *pstate, Node **pnode)
{
Oid inputTypeId = exprType(*pnode);
Oid targetTypeId;
if (inputTypeId == BOOLOID)
return true; /* no work */
targetTypeId = BOOLOID;
if (! can_coerce_type(1, &inputTypeId, &targetTypeId))
return false; /* fail, but let caller choose error msg */
*pnode = coerce_type(pstate, *pnode, inputTypeId, targetTypeId, -1);
return true;
}
/* select_common_type()
* Determine the common supertype of a list of input expression types.
* This is used for determining the output type of CASE and UNION