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DROP TABLE IF EXISTS t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>, <CUSTOM_INDEX> (a) KEY_BLOCK_SIZE=8 ) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; SHOW KEYS IN t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 a 1 a # # NULL NULL # # DROP TABLE t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>, <CUSTOM_INDEX> ind1(b ASC) KEY_BLOCK_SIZE=0 ) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; SHOW INDEX IN t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 ind1 1 b # # NULL NULL # # DROP TABLE t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>, UNIQUE INDEX ind2(b(1) DESC) KEY_BLOCK_SIZE=32768 COMMENT 'big key_block_size value' ) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; SHOW INDEX IN t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 0 ind2 1 b # # 1 NULL # # big key_block_size value DROP TABLE t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>, <CUSTOM_INDEX> a_b(a,b) KEY_BLOCK_SIZE=8192 ) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; SHOW INDEX IN t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 a_b 1 a # # NULL NULL # # t1 1 a_b 2 b # # NULL NULL # # DROP TABLE t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN> ) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; INSERT INTO t1 (a,b) VALUES (100,'z'); ALTER TABLE t1 ADD <CUSTOM_INDEX>(a) KEY_BLOCK_SIZE 8192; SHOW INDEX FROM t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 1 a 1 a # # NULL NULL # # DROP TABLE t1;