Method dispose

lib/sqlalchemy/sql/base.py:1753–1762

(self, collection: ColumnCollection[_COLKEY, _COL_co])

        return self.column._expanded_proxy_set

    def dispose(self, collection: ColumnCollection[_COLKEY, _COL_co]) -> None:
        pi = collection._proxy_index
        if not pi:
            return
        for col in self.column._expanded_proxy_set:
            colset = pi.get(col, None)
            if colset:
                colset.discard(self)
            if colset is not None and not colset:
                del pi[col]

    def embedded(
        self,