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

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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());
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SELECT count() FROM min_max_with_nullable_string WHERE nullable_str = '.';
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INSERT INTO min_max_with_nullable_string(t, nullable_str) VALUES (now(), '.') (now(), '.');
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SELECT count() FROM min_max_with_nullable_string WHERE nullable_str = '.';
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INSERT INTO min_max_with_nullable_string(t, nullable_str) VALUES (now(), NULL) (now(), '.') (now(), NULL) (now(), '.') (now(), NULL);
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SELECT count() FROM min_max_with_nullable_string WHERE nullable_str = '.';
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SELECT count() FROM min_max_with_nullable_string WHERE nullable_str = '';
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DROP TABLE min_max_with_nullable_string;