Reduced testcase
SET expand_fast_index_creation=1; CREATE TEMPORARY TABLE t1(id int, key id (id)) engine=innodb; INSERT INTO t1 VALUES(0xABE3); ALTER TABLE t1 ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=1;
Reduced testcase
SET expand_ fast_index_ creation= 1; COMPRESSED KEY_BLOCK_SIZE=1;
CREATE TEMPORARY TABLE t1(id int, key id (id)) engine=innodb;
INSERT INTO t1 VALUES(0xABE3);
ALTER TABLE t1 ROW_FORMAT=