bug: virtual generated column can be partition key

hi.
While trying to make the virtual generated column be part of the partition key,
I found this bug.
it also influences the stored generated column, i added a test
on generated_stored.sql.

CREATE TABLE gtest_part_key (
f1 date NOT NULL, f2 bigint,
f3 bigint GENERATED ALWAYS AS (f2 * 2) VIRTUAL)
PARTITION BY RANGE (f3);

ERROR: cannot use generated column in partition key
LINE 4: PARTITION BY RANGE (f3);
^
DETAIL: Column "f3" is a generated column.

the following is essentially the same as above, it should also fail.

CREATE TABLE gtest_part_key (
f1 date NOT NULL, f2 bigint,
f3 bigint GENERATED ALWAYS AS (f2 * 2) VIRTUAL)
PARTITION BY RANGE ((f3));