ClickHouse/tests/queries/0_stateless/00456_alter_nullable.sql

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DROP TABLE IF EXISTS nullable_alter;
CREATE TABLE nullable_alter (d Date DEFAULT '2000-01-01', x String) ENGINE = MergeTree(d, d, 1);
INSERT INTO nullable_alter (x) VALUES ('Hello'), ('World');
SELECT x FROM nullable_alter ORDER BY x;
ALTER TABLE nullable_alter MODIFY COLUMN x Nullable(String);
SELECT x FROM nullable_alter ORDER BY x;
INSERT INTO nullable_alter (x) VALUES ('xyz'), (NULL);
SELECT x FROM nullable_alter ORDER BY x NULLS FIRST;
ALTER TABLE nullable_alter MODIFY COLUMN x Nullable(FixedString(5));
SELECT x FROM nullable_alter ORDER BY x NULLS FIRST;
DROP TABLE nullable_alter;