text: DROP TABLE IF EXISTS test.index_memory;
  CREATE TABLE test.index_memory (x UInt64) ENGINE = MergeTree ORDER BY x SETTINGS index_granularity = 1;
  INSERT INTO test.index_memory SELECT * FROM system.numbers LIMIT 10000000;
  SELECT count() FROM test.index_memory;
  DETACH TABLE test.index_memory;
  SET max_memory_usage = 79000000;
  ATTACH TABLE test.index_memory;
  SELECT count() FROM test.index_memory;
  DROP TABLE test.index_memory;
  