# Copyright Materialize, Inc. and contributors. All rights reserved.
#
# Use of this software is governed by the Business Source License
# included in the LICENSE file at the root of this repository.
#
# As of the Change Date specified in that file, in accordance with
# the Business Source License, use of this software will be governed
# by the Apache License, Version 2.0.

mode cockroach

query B
SELECT 1 is null
----
false

query B
SELECT 1 isnull
----
false

query B
SELECT null is null
----
true

query B
select null isnull
----
true

query B
select 1 = 1 is true
----
true

query B
select 1 = 1 is false
----
false

query B
select NULL = 1 is unknown
----
true

query B
select 2 = 1 is not unknown
----
true

query B
select 'true' is true
----
true

query error clause must have type boolean
select 'true'::text is true

query error clause must have type boolean
select 'true'::text is unknown

query B
select 'true'::text is NULL
----
false

query B
select NULL is true
----
false

query error invalid input syntax for type boolean
select '1 = 1' is true

query B
select '1 = 1' is null
----
false

query error clause must have type boolean
select 2 is true