const struct json *, const struct ovsdb_table_schema *,
struct ovsdb_column_set *);
struct json *ovsdb_column_set_to_json(const struct ovsdb_column_set *);
+char *ovsdb_column_set_to_string(const struct ovsdb_column_set *);
void ovsdb_column_set_add(struct ovsdb_column_set *,
const struct ovsdb_column *);