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.. change::
:tags: bug, operations
:tickets: 1215
Fixed issue where using a directive such as ``op.create_foreign_key()`` to
create a self-referential constraint on a single table where the same
column were present on both sides (e.g. within a composite foreign key)
would produce an error under SQLAlchemy 2.0 and a warning under SQLAlchemy
1.4 indicating that a duplicate column were being added to a table.
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