some TODO items squezed

table.h

@@ -59,6 +59,7 @@ struct Table {
 	Index * get_index(const std::string &index_name);
 	Index * get_index_for_column(const std::string &col_name);
 
+	bool empty();
 
 	struct rows_scanner {
 		explicit rows_scanner(Table *tbl) : m_use_rowids(false), m_table(tbl), m_fscan_itr(tbl->m_rows.begin()) {}