[TD-225] add a test case.

tests/script/general/parser/constCol.sim

@@ -347,6 +347,17 @@ if $rows != 3 then
   return -1
 endi
 
+sql select 0.1 + 0.2 from t1
+if $rows != 3 then
+  return -1
+endi
+
+print =============================> td-2036
+if $data00 != 0.3000000 then
+  print expect: 0.3000000, actual:$data00
+  return -1
+endi
+
 print ======================udc with normal column group by
 
 sql_error select from t1