drop table if exists test_max_parallel_replicas_lr; -- If you wonder why the table is named with "_lr" suffix in this test. -- No reason. Actually it is the name of the table in Yandex.Market and they provided this test case for us. CREATE TABLE test_max_parallel_replicas_lr (timestamp UInt64) ENGINE = MergeTree ORDER BY (intHash32(timestamp)) SAMPLE BY intHash32(timestamp); INSERT INTO test_max_parallel_replicas_lr select number as timestamp from system.numbers limit 100; SET max_parallel_replicas = 2; select count() FROM remote('127.0.0.{2|3}', currentDatabase(), test_max_parallel_replicas_lr) PREWHERE timestamp > 0; drop table test_max_parallel_replicas_lr;