Core: Select for rewriting the files belonging to old partitioning schemes

[adrians]

After doing a partition-evolution attempt, the implicit rewrite_data_files procedure will not pick up files belonging to the old partitioning schema.

The only way to rewrite those files is to use the rewrite-all parameter (and have to rewrite even files that are correctly-sized and correctly-placed - this becomes problematic for tables larger with more than 1TB in size) or through a series of Copy-On-Write updates (which doesn't fit the environment I work on, since that table will not be used for writing in a while).

In this fix, I've modified the implicit criteria for selection in the rewrite_data_files procedure in order to also target the files of the old partitioning scheme.