# 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 for error semantics and evaluation order/short-circuiting, see
# https://github.com/MaterializeInc/database-issues/issues/4972
#

########################################################################################################################
# NOTE: THESE EXPECTED RESULTS ARE NOT SET IN STONE! The results, together with occasional comments above them, are our
# current best guess of what our error semantics will be, but it's ok to change this for now as we learn more.
########################################################################################################################

statement ok
create table test (a int, b int);

statement ok
insert into test values (1, 0);

query I
select coalesce(a, 1/b) from test;
----
1

# Postgres errors on it, which we consider to be a bug in Postgres, because Postgres' coalesce docs say it should
# short-circuit: https://www.postgresql.org/docs/current/functions-conditional.html#FUNCTIONS-COALESCE-NVL-IFNULL
query I
select coalesce(a, 1/0) from test;
----
1

query I
select coalesce(a, 1/b) from test where b = 0;
----
1

query I
select coalesce(7, 1/b) from test;
----
7

query I
select coalesce(7, 1/0) from test;
----
7

statement ok
create table test_nonnull (a int not null, b int);

statement ok
insert into test_nonnull values (1, 0);

query I
select coalesce(a, 1/b) from test_nonnull;
----
1

# Postgres errors, which we consider to be a bug in Postgres
query I
select coalesce(a, 1/0) from test_nonnull;
----
1

query I
select coalesce(a, 1/b) from test_nonnull where b = 0;
----
1

query I
select coalesce(7, 1/b) from test_nonnull;
----
7

query I
select coalesce(7, 1/0) from test_nonnull;
----
7

# MFP CSE, see https://github.com/MaterializeInc/materialize/pull/33109
query I
select coalesce(a, a/b + 1, a/b + 2) from test;
----
1

# The following two results are probably wrong (but depends on what error semantics we agree on later).
query error db error: ERROR: Evaluation error: division by zero
select coalesce(a, (select a/b from test)) from test;

query error db error: ERROR: Evaluation error: division by zero
select *, case when a = 5 then (select a/b from test) else 7 end from test;