small refactoring

debug.h

@@ -25,6 +25,8 @@ std::vector<std::string> k_debug_sql_commands {
 		"insert into a (i, s) values(2, 'two')",
 		"insert into a (i, s) values(2, 'second two')",
 		"insert into a (i, s) values(3, 'three')",
+		"insert into a (i, s) values(4, 'four')",
+		"save a into '/tmp/a.csv'",
 		"set 'USE_INDEXSCAN' = 'true'",
 //		"select * from a where 1 = i",
 //		"delete from a where i = 2 and s ='two'",