DROP TABLE IF EXISTS t1; SET allow_experimental_statistic = 1; SET allow_statistic_optimize = 1; CREATE TABLE t1 ( a Float64 STATISTIC(tdigest), b Int64 STATISTIC(tdigest), pk String, ) Engine = MergeTree() ORDER BY pk SETTINGS min_bytes_for_wide_part = 0; SHOW CREATE TABLE t1; INSERT INTO t1 select number, -number, generateUUIDv4() FROM system.numbers LIMIT 10000; SELECT 'After insert'; EXPLAIN SYNTAX SELECT count(*) FROM t1 WHERE b < 10 and a < 10; SELECT count(*) FROM t1 WHERE b < 10 and a < 10; SELECT count(*) FROM t1 WHERE b < NULL and a < '10'; ALTER TABLE t1 DROP STATISTIC a, b TYPE tdigest; SELECT 'After drop statistic'; EXPLAIN SYNTAX SELECT count(*) FROM t1 WHERE b < 10 and a < 10; SELECT count(*) FROM t1 WHERE b < 10 and a < 10; SHOW CREATE TABLE t1; ALTER TABLE t1 ADD STATISTIC a, b TYPE tdigest; SELECT 'After add statistic'; SHOW CREATE TABLE t1; ALTER TABLE t1 MATERIALIZE STATISTIC a, b TYPE tdigest; INSERT INTO t1 select number, -number, generateUUIDv4() FROM system.numbers LIMIT 10000; SELECT 'After materialize statistic'; EXPLAIN SYNTAX SELECT count(*) FROM t1 WHERE b < 10 and a < 10; SELECT count(*) FROM t1 WHERE b < 10 and a < 10; OPTIMIZE TABLE t1 FINAL; SELECT 'After merge'; EXPLAIN SYNTAX SELECT count(*) FROM t1 WHERE b < 10 and a < 10; SELECT count(*) FROM t1 WHERE b < 10 and a < 10; ALTER TABLE t1 RENAME COLUMN b TO c; SHOW CREATE TABLE t1; SELECT 'After rename'; EXPLAIN SYNTAX SELECT count(*) FROM t1 WHERE c < 10 and a < 10; SELECT count(*) FROM t1 WHERE c < 10 and a < 10; DROP TABLE IF EXISTS t1;