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Mike Bayer
d49eef15bf
Added new attribute :attr:`_sql.Select.columns_clause_froms` that will retrieve the FROM list implied by the columns clause of the :class:`_sql.Select` statement. This differs from the old :attr:`_sql.Select.froms` collection in that it does not perform any ORM compilation steps, which necessarily deannotate the FROM elements and do things like compute joinedloads etc., which makes it not an appropriate candidate for the :meth:`_sql.Select.select_from` method. Additionally adds a new parameter :paramref:`_sql.Select.with_only_columns.maintain_column_froms` that transfers this collection to :meth:`_sql.Select.select_from` before replacing the columns collection. In addition, the :attr:`_sql.Select.froms` is renamed to :meth:`_sql.Select.get_final_froms`, to stress that this collection is not a simple accessor and is instead calculated given the full state of the object, which can be an expensive call when used in an ORM context. Additionally fixes a regression involving the :func:`_orm.with_only_columns` function to support applying criteria to column elements that were replaced with either :meth:`_sql.Select.with_only_columns` or :meth:`_orm.Query.with_entities` , which had broken as part of 🎫`6503` released in 1.4.19. Fixes: #6808 Change-Id: Ib5d66cce488bbaca06dab4f68fb5cdaa73e8823e