Sliced remove()

[Jeroen T. Vermeulen]

It would be useful to me to be able to remove tuples selected by a sliced query, i.e. "delete x rows from this result set." It helps spread out garbage collection so as not to overload our databases.

I imagine the complication would be to identify a key that can be selected in a limited sub-query and passed to a surrounding DELETE query.

[James Henstridge (jamesh)]

This could probably be implemented similar to how Store.__contains__() handles non-trivial cases by using replace_columns() to generate a subquery expression.