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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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6
src/include/nodes/nodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: nodes.h,v 1.90 2001/06/09 23:21:55 petere Exp $
* $Id: nodes.h,v 1.91 2001/06/19 22:39:12 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -218,8 +218,8 @@ typedef enum NodeTag
T_RangeTblEntry,
T_SortClause,
T_GroupClause,
T_SubSelectXXX, /* not used anymore; tag# available */
T_oldJoinExprXXX, /* not used anymore; tag# available */
T_NullTest,
T_BooleanTest,
T_CaseExpr,
T_CaseWhen,
T_RowMarkXXX, /* not used anymore; tag# available */