forbid to create/alter a table with TTL options when pk contains float/double column

[lcwangchao]

For current implementation we construct the delete sql to delete expired rows, for example:

DELETE FROM t WHERE pk IN (1, 2)

If the primary key is a float/double value, the expired rows may not be deleted successfully because the precision problem. We need to forbid creating/altering a table with TTL options in this case.