text: DROP TABLE IF EXISTS min_max_with_nullable_string;
  
  CREATE TABLE min_max_with_nullable_string (
    t DateTime,
    nullable_str Nullable(String),
    INDEX nullable_str_min_max nullable_str TYPE minmax GRANULARITY 8192
  ) ENGINE = MergeTree ORDER BY (t);
  
  INSERT INTO min_max_with_nullable_string(t) VALUES (now()) (now());
  
  SELECT count() FROM min_max_with_nullable_string WHERE nullable_str = '.';
  
  INSERT INTO min_max_with_nullable_string(t, nullable_str) VALUES (now(), '.') (now(), '.');
  
  SELECT count() FROM min_max_with_nullable_string WHERE nullable_str = '.';
  
  INSERT INTO min_max_with_nullable_string(t, nullable_str) VALUES (now(), NULL) (now(), '.') (now(), NULL) (now(), '.') (now(), NULL);
  
  SELECT count() FROM min_max_with_nullable_string WHERE nullable_str = '.';
  
  SELECT count() FROM min_max_with_nullable_string WHERE nullable_str = '';
  
  DROP TABLE min_max_with_nullable_string;