# Copyright 2015 - 2019 The Cockroach Authors. All rights reserved.
# 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.
#
# This file is derived from the logic test suite in CockroachDB. The
# original file was retrieved on June 10, 2019 from:
#
#     https://github.com/cockroachdb/cockroach/blob/d2f7fbf5dd1fc1a099bbad790a2e1f7c60a66cc3/pkg/sql/logictest/testdata/logic_test/conditional
#
# The original source code is subject to the terms of the Apache
# 2.0 license, a copy of which can be found in the LICENSE file at the
# root of this repository.

mode cockroach

query II
SELECT IF(1 = 2, NULL, 1), IF(2 = 2, NULL, 2)
----
1  NULL

query III
SELECT NULLIF(1, 2), NULLIF(2, 2), NULLIF(NULL, NULL)
----
1  NULL  NULL

query IIII
SELECT
    IFNULL(1, 2),
    IFNULL(NULL, 2),
    COALESCE(1, 2),
    COALESCE(NULL, 2)
----
1  2  1  2

statement ok
CREATE TABLE t (a) AS VALUES (1), (2), (3)

query IT
SELECT
    a,
    CASE
    WHEN a = 1 THEN 'one'
    WHEN a = 2 THEN 'two'
    ELSE 'other'
    END
FROM
    t
ORDER BY
    a
----
1  one
2  two
3  other

query IT
SELECT
    a,
    CASE a
    WHEN 1 THEN 'one'
    WHEN 2 THEN 'two'
    ELSE 'other'
    END
FROM
    t
ORDER BY
    a
----
1  one
2  two
3  other

query III
SELECT a, NULLIF(a, 2), IF(a = 2, NULL, a) FROM t ORDER BY a
----
1  1     1
2  NULL  NULL
3  3     3

query TTTT
SELECT
    CASE
    WHEN false THEN 'one'
    WHEN true THEN 'two'
    ELSE 'three'
    END,
    CASE 1
    WHEN 2 THEN 'two'
    WHEN 1 THEN 'one'
    ELSE 'three'
    END,
    CASE
    WHEN false THEN 'one'
    ELSE 'three'
    END,
    CASE
    WHEN false THEN 'one'
    END
----
two  one  three  NULL

query TTTTT
SELECT
    CASE
    WHEN 1 = 1 THEN 'one'
    END,
    CASE false
    WHEN 0 = 1 THEN 'one'
    END,
    CASE 1
    WHEN 2 THEN 'one'
    ELSE 'three'
    END,
    CASE NULL
    WHEN true THEN 'one'
    WHEN false THEN 'two'
    WHEN NULL THEN 'three'
    ELSE 'four'
    END,
    CASE
    WHEN false THEN 'one'
    WHEN true THEN 'two'
    END
----
one  one  three  four  two