def tables_referencing(self, tbl):
        if tbl not in self.tables:
            return set()
        reftables = set()
        for c in self.tables[tbl].columns:
            reftables.update({col.table.name for col in c.referenced_by})
        return reftables
dataset/ETHPy150Open jaysw/ipydb/ipydb/metadata/model.py/Database.tables_referencing/original