const struct json *, const struct ovsdb_table_schema *,
struct ovsdb_column_set *);
struct json *ovsdb_column_set_to_json(const struct ovsdb_column_set *);
const struct json *, const struct ovsdb_table_schema *,
struct ovsdb_column_set *);
struct json *ovsdb_column_set_to_json(const struct ovsdb_column_set *);