我试图将遗留的 bigint 字段转换为一系列 uuid:
DELIMITER |
CREATE FUNCTION uuid_from_bigint(b bigint) RETURNS CHAR(36) BEGIN
DECLARE hex CHAR(32);
SET hex = lpad(hex(b), 32, '0');
RETURN CONCAT(LEFT(hex, 8), '-', MID(hex, 9,4), '-', MID(hex, 13,4), '-', MID(hex, 17,4), '-', RIGHT(hex, 12));
END
|
DELIMITER ;
有人可以帮我理解为什么这会导致以下问题吗?
mysql> select uuid_from_bigint(9);
ERROR 1436 (HY000): Thread stack overrun: 12816 bytes used of a 131072 byte stack, and 128000 bytes needed. Use 'mysqld --thread_stack=#' to specify a bigger stack.