DROP TABLE IF EXISTS test_table SYNC; CREATE TABLE test_table ( id UInt64, value String ) ENGINE=ReplicatedMergeTree('/clickhouse/test/{database}/test_table', 'r1') ORDER BY tuple(); INSERT INTO test_table VALUES (0, 'Value_0'), (1, 'Value_1'), (2, 'Value_2'); DROP TABLE IF EXISTS test_table_for_in SYNC; CREATE TABLE test_table_for_in ( id UInt64 ) ENGINE=ReplicatedMergeTree('/clickhouse/test/{database}/test_table_for_in', 'r1') ORDER BY tuple(); INSERT INTO test_table_for_in VALUES (0), (1); SET allow_experimental_parallel_reading_from_replicas=1, max_parallel_replicas=3, cluster_for_parallel_replicas='test_cluster_one_shard_three_replicas_localhost'; SELECT id, value FROM test_table WHERE id IN (SELECT id FROM test_table_for_in UNION DISTINCT SELECT id FROM test_table_for_in); DROP TABLE test_table SYNC; DROP TABLE test_table_for_in SYNC;