ClickHouse/dbms/tests/queries/0_stateless/00944_minmax_null.sql

DROP TABLE IF EXISTS min_max_with_nullable_string;
SET allow_experimental_data_skipping_indices = 1;

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;