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4b31736343
Previously, it was impossible to have a Table that has
None for a schema name when the "schema" parameter on
MetaData was set. A new symbol sqlalchemy.schema.BLANK_SCHEMA
is added which indicates that the schema name should unconditionally
be set to None. In particular, this value must be passed within
cross-schema foreign key reflection, so that a Table which
is in the "default" schema can be represented properly.
Fixes: #3716
Change-Id: I3d24f99c22cded206c5379fd32a225e74edb7a8e
(cherry picked from commit c124fa36d5)