simple distinct added

main.cpp

@@ -18,6 +18,7 @@ int main(int argc, char *argv[]) {
 		    "insert into a (i, s) values(to_date('20.12.1973', '%d.%m.%Y'), 'six')",
 		    "save table a into '/tmp/a.csv'",
 		    "select i, s from a where i > 2 order by 1 desc offset 1 limit 1",
+		    "select distinct s from a",
 //		    "select i, s from a where i = 1",
 //		    "select i, s from a where s = 'two'",
 //		    "select i, s from a where i <= 3 and s = 'one'",