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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2001-06-19 22:39:12 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2001-06-19 22:39:12 +0000 |
| commit | 116d2bba7eeaf25c544bc187e3ad2a8677a9a22c (patch) | |
| tree | c77a6b20a3acdbb6e25a1fc4a561c0e839ddbb1e /src/backend/optimizer/util/clauses.c | |
| parent | 8c30aca2ba1a48d38b1206f8559d1dc6b65c5ca7 (diff) | |
| download | postgresql-116d2bba7eeaf25c544bc187e3ad2a8677a9a22c.tar.gz postgresql-116d2bba7eeaf25c544bc187e3ad2a8677a9a22c.zip | |
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.
Diffstat (limited to 'src/backend/optimizer/util/clauses.c')
| -rw-r--r-- | src/backend/optimizer/util/clauses.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c index e0cc97e3a1d..6ee962fd75c 100644 --- a/src/backend/optimizer/util/clauses.c +++ b/src/backend/optimizer/util/clauses.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.85 2001/05/20 20:28:19 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.86 2001/06/19 22:39:11 tgl Exp $ * * HISTORY * AUTHOR DATE MAJOR EVENT @@ -1580,6 +1580,10 @@ expression_tree_walker(Node *node, return true; } break; + case T_NullTest: + return walker(((NullTest *) node)->arg, context); + case T_BooleanTest: + return walker(((BooleanTest *) node)->arg, context); case T_SubLink: { SubLink *sublink = (SubLink *) node; @@ -1933,6 +1937,26 @@ expression_tree_mutator(Node *node, return (Node *) newnode; } break; + case T_NullTest: + { + NullTest *ntest = (NullTest *) node; + NullTest *newnode; + + FLATCOPY(newnode, ntest, NullTest); + MUTATE(newnode->arg, ntest->arg, Node *); + return (Node *) newnode; + } + break; + case T_BooleanTest: + { + BooleanTest *btest = (BooleanTest *) node; + BooleanTest *newnode; + + FLATCOPY(newnode, btest, BooleanTest); + MUTATE(newnode->arg, btest->arg, Node *); + return (Node *) newnode; + } + break; case T_SubLink: { |