langchain/utilities/powerbi.py/PowerBIDataset/_get_schema_for_tables
class PowerBIDataset:    def _get_schema_for_tables(self, table_names: List[str]) -> str:
        """Create a string of the table schemas for the supplied tables."""
        schemas = [
            schema for table, schema in self.schemas.items() if table in table_names
        ]
        return ", ".join(schemas)