Materialize/test/sqllogictest/github-6388.slt

# 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

# Regression test for
# https://github.com/MaterializeInc/database-issues/issues/6388.

statement ok
CREATE TABLE r(x bool);

statement ok
CREATE VIEW v AS SELECT nullif(to_jsonb(true), to_jsonb(x)) as y FROM r;


# When the bug is present, the type of `y` is wrongly computed as `boolean` when
# the `(true, _)` simplification of the `case` statement resulting from the
# desugared `nullif` is triggered in `MirScalarExpr::reduce`.
query TTTT
SHOW COLUMNS from v;
----
y  true  jsonb (empty)