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# may need to be a InterRevisionStore call here.
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from_transaction = self.from_repository.get_transaction()
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to_transaction = self.to_repository.get_transaction()
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to_sf.join(from_sf, version_ids=revs, pb=self.pb, ignore_missing=True)
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to_rf = self.to_repository._revision_store.get_revision_file(