DROP TABLE IF EXISTS table_old; DROP TABLE IF EXISTS table_new; CREATE TABLE table_old (k UInt64, d Array(String)) ENGINE = ReplicatedMergeTree('/clickhouse/test/tables/checksums_test', 'old') ORDER BY k SETTINGS use_minimalistic_checksums_in_zookeeper=0; CREATE TABLE table_new (k UInt64, d Array(String)) ENGINE = ReplicatedMergeTree('/clickhouse/test/tables/checksums_test', 'new') ORDER BY k SETTINGS use_minimalistic_checksums_in_zookeeper=1; SET insert_quorum=2; INSERT INTO table_old VALUES (0, []); SELECT value LIKE '%checksums format version: 4%' FROM system.zookeeper WHERE path='/clickhouse/test/tables/checksums_test/replicas/old/parts/all_0_0_0' AND name = 'checksums'; INSERT INTO table_new VALUES (1, []); SELECT value LIKE '%checksums format version: 5%' FROM system.zookeeper WHERE path='/clickhouse/test/tables/checksums_test/replicas/new/parts/all_1_1_0' AND name = 'checksums'; OPTIMIZE TABLE table_old; SELECT * FROM table_old ORDER BY k; SELECT * FROM table_new ORDER BY k; SELECT 'DETACH'; DETACH TABLE table_old; ATTACH TABLE table_old (k UInt64, d Array(String)) ENGINE = ReplicatedMergeTree('/clickhouse/test/tables/checksums_test', 'old') ORDER BY k SETTINGS use_minimalistic_checksums_in_zookeeper=1; SELECT * FROM table_old ORDER BY k; DROP TABLE IF EXISTS table_old; DROP TABLE IF EXISTS table_new;