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Mike Bayer
0cd1104323
The ``.c`` and ``.columns`` attributes on the :class:`.Select` and :class:`.TextualSelect` constructs, which are not instances of :class:`.FromClause`, have been removed completely, in addition to the ``.select()`` method as well as other codepaths which would implicitly generate a subquery from a :class:`.Select` without the need to explicitly call the :meth:`.Select.subquery` method. In the case of ``.c`` and ``.columns``, these attributes were never useful in practice and have caused a great deal of confusion, hence were deprecated back in version 1.4, and have emitted warnings since that version. Accessing the columns that are specific to a :class:`.Select` construct is done via the :attr:`.Select.selected_columns` attribute, which was added in version 1.4 to suit the use case that users often expected ``.c`` to accomplish. In the larger sense, implicit production of subqueries works against SQLAlchemy's modern practice of making SQL structure as explicit as possible. Note that this is **not related** to the usual :attr:`.FromClause.c` and :attr:`.FromClause.columns` attributes, common to objects such as :class:`.Table` and :class:`.Subquery`, which are unaffected by this change. Fixes: #10236 Change-Id: If241b8674ccacce7e860bfed25b5d266bfe1aca7