Materialize/test/sqllogictest/github-3256.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.

# Regression test for https://github.com/MaterializeInc/database-issues/issues/3256

mode cockroach

statement ok
CREATE TABLE repro(f1 int, f2 string);

statement ok
INSERT INTO repro VALUES (1, null);

statement ok
CREATE VIEW repro_v AS SELECT f1, string_agg(f2, 'a') nullable_string_agg FROM repro GROUP BY f1;

# Check that the query now works
query IT
SELECT * FROM repro_v
----
1 NULL

# Check that the column is now marked as nullable if the input is null
query T
SELECT attnotnull FROM pg_catalog.pg_attribute WHERE attname = 'nullable_string_agg'
----
false

# Check that string_agg can be made non-nullable if the input is not null
statement ok
CREATE TABLE repro2(f1 int, f2 string NOT NULL);

statement ok
INSERT INTO repro2 VALUES (1, 'a');

statement ok
CREATE VIEW repro2_v AS SELECT f1, string_agg(f2, 'a') nonnull_string_agg FROM repro2 GROUP BY f1;

query T
SELECT attnotnull FROM pg_catalog.pg_attribute WHERE attname = 'nonnull_string_agg'
----
true