Improved SELECT * handling

Reducing errors due to * not being cleared.

This may be a breaking change, if you depended on the SELECT * not being cleared, and adding more selects.
What really happened most of the time is that the Select was not intuitive, as the SELECT * was there by default, and was not removed by a simple Select call.
Now if you want * and other columns, you have to specify so explicitly, with the specific table for *, to make it deterministic.