By either defining their types or renaming to match parent class (or
interface).

This reverts commit e3ab1276, reversing
changes made to f988b0a6.

The reasoning behind this is to essentially rely on a single type (or
the absence of it), therefore add type declarations.

Since these are private methods we can do that without breaking BC.

fixes #1339
closes #921

Take the column order into account and sort non PK columns last