distinct_on.slt

# 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/distinct_on
#
# 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.

# The tests in this file lock in plans for DISTINCT ON. Correctness tests are in
# cockroach/distinct_on.slt.

statement ok
CREATE TABLE abc (
  a text,
  b text,
  c text
)

query T multiline
EXPLAIN WITH(arity, join implementations) SELECT DISTINCT ON (c) a FROM abc
----
Explained Query:
  Project (#0) // { arity: 1 }
    TopK group_by=[#1] limit=1 // { arity: 2 }
      Project (#0, #2) // { arity: 2 }
        ReadStorage materialize.public.abc // { arity: 3 }

Source materialize.public.abc

Target cluster: quickstart

EOF

query T multiline
EXPLAIN WITH(arity, join implementations) SELECT DISTINCT ON (c) a FROM abc ORDER BY c, b
----
Explained Query:
  Finish order_by=[#2 asc nulls_last, #1 asc nulls_last] output=[#0]
    TopK group_by=[#2] order_by=[#1 asc nulls_last] limit=1 // { arity: 3 }
      ReadStorage materialize.public.abc // { arity: 3 }

Source materialize.public.abc

Target cluster: quickstart

EOF