MariaDB [test]> CREATE TABLE t1 (a int unsigned AS ( CAST(0 AS UNSIGNED) -1) STORED);
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ERROR 1901 (HY000): Function or expression 'cast(0 as unsigned) - 1' cannot be used in the GENERATED ALWAYS AS clause of `a`
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MariaDB [test]> set sql_mode=no_unsigned_subtraction;
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Query OK, 0 rows affected (0.000 sec)
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MariaDB [test]> CREATE TABLE t1 (a int unsigned AS ( CAST(0 AS UNSIGNED) -1) STORED);
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Query OK, 0 rows affected (0.014 sec)
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there are other sql modes that affect other functions and expressions. may be they're also affected, I didn't check that
Bug
Major
