ClickHouse/tests/queries/0_stateless/02934_merge_tree_max_projections.sql

DROP TABLE IF EXISTS test_max_mt_projections_alter;
CREATE TABLE test_max_mt_projections_alter (c1 UInt32, c2 UInt32, c3 UInt32)
        ENGINE = MergeTree ORDER BY c1
        SETTINGS max_projections = 3;

ALTER TABLE test_max_mt_projections_alter ADD PROJECTION p1 (SELECT c2 ORDER BY c2);
ALTER TABLE test_max_mt_projections_alter ADD PROJECTION p2 (SELECT c3 ORDER BY c3);
ALTER TABLE test_max_mt_projections_alter ADD PROJECTION p3 (SELECT c1, c2 ORDER BY c1, c2);

ALTER TABLE test_max_mt_projections_alter
        ADD PROJECTION p4 (SELECT c2, c3 ORDER BY c2, c3); -- { serverError LIMIT_EXCEEDED }

ALTER TABLE test_max_mt_projections_alter DROP PROJECTION p3;

ALTER TABLE test_max_mt_projections_alter ADD PROJECTION p4 (SELECT c2, c3 ORDER BY c2, c3);

DROP TABLE IF EXISTS test_max_mt_projections_alter;

DROP TABLE IF EXISTS test_max_mt_projections_create;
CREATE TABLE test_max_mt_projections_create (c1 UInt32, c2 UInt32,
        PROJECTION p1 (SELECT c1, c2 ORDER BY c2),
        PROJECTION p2 (SELECT c2 ORDER BY c2))
        ENGINE = MergeTree ORDER BY c1
        SETTINGS max_projections = 1; -- { serverError LIMIT_EXCEEDED }

CREATE TABLE test_max_mt_projections_create (c1 UInt32, c2 UInt32,
        PROJECTION p (SELECT c1, c2 ORDER BY c2))
        ENGINE = MergeTree ORDER BY c1
        SETTINGS max_projections = 0; -- { serverError LIMIT_EXCEEDED }

CREATE TABLE test_max_mt_projections_create (c1 UInt32, c2 UInt32,
        PROJECTION p (SELECT c1, c2 ORDER BY c2))
        ENGINE = MergeTree ORDER BY c1
        SETTINGS max_projections = 1;

ALTER TABLE test_max_mt_projections_create
        ADD PROJECTION p2 (SELECT c2 ORDER BY c2); -- { serverError LIMIT_EXCEEDED }

DROP TABLE IF EXISTS test_max_mt_projections_create;