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Implement IS NOT DISTINCT FROM, update the regression tests and docs.

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Patch from Pavel Stehule, minor fixups by myself.
This commit is contained in:
Neil Conway
2005-12-11 10:54:28 +00:00
parent c10593149a
commit be8100d64e
4 changed files with 57 additions and 6 deletions
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14
src/backend/parser/gram.y
View File

@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.516 2005/11/28 04:35:31 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.517 2005/12/11 10:54:27 neilc Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -6715,6 +6715,13 @@ a_expr: c_expr { $$ = $1; }
{
$$ = (Node *) makeSimpleA_Expr(AEXPR_DISTINCT, "=", $1, $5);
}
| a_expr IS NOT DISTINCT FROM a_expr %prec IS
{
$$ = (Node *) makeA_Expr(AEXPR_NOT, NIL, NULL,
(Node *) makeSimpleA_Expr(AEXPR_DISTINCT,
"=", $1, $6));
}
| a_expr IS OF '(' type_list ')' %prec IS
{
$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "=", $1, (Node *) $5);
@ -6880,6 +6887,11 @@ b_expr: c_expr
{
$$ = (Node *) makeSimpleA_Expr(AEXPR_DISTINCT, "=", $1, $5);
}
| b_expr IS NOT DISTINCT FROM b_expr %prec IS
{
$$ = (Node *) makeA_Expr(AEXPR_NOT, NIL,
NULL, (Node *) makeSimpleA_Expr(AEXPR_DISTINCT, "=", $1, $6));
}
| b_expr IS OF '(' type_list ')' %prec IS
{
$$ = (Node *) makeSimpleA_Expr(AEXPR_OF, "=", $1, (Node *) $5);

25
src/test/regress/expected/select_distinct.out
View File

@ -195,3 +195,28 @@ SELECT null IS DISTINCT FROM null as "no";
f
(1 row)
-- ANSI SQL 2003 form
SELECT 1 IS NOT DISTINCT FROM 2 as "no";
no
----
f
(1 row)
SELECT 2 IS NOT DISTINCT FROM 2 as "yes";
yes
-----
t
(1 row)
SELECT 2 IS NOT DISTINCT FROM null as "no";
no
----
f
(1 row)
SELECT null IS NOT DISTINCT FROM null as "yes";
yes
-----
t
(1 row)

6
src/test/regress/sql/select_distinct.sql
View File

@ -56,3 +56,9 @@ SELECT 1 IS DISTINCT FROM 2 as "yes";
SELECT 2 IS DISTINCT FROM 2 as "no";
SELECT 2 IS DISTINCT FROM null as "yes";
SELECT null IS DISTINCT FROM null as "no";
-- ANSI SQL 2003 form
SELECT 1 IS NOT DISTINCT FROM 2 as "no";
SELECT 2 IS NOT DISTINCT FROM 2 as "yes";
SELECT 2 IS NOT DISTINCT FROM null as "no";
SELECT null IS NOT DISTINCT FROM null as "yes";