add test cases

tests/script/tsim/parser/fill.sim

@@ -1143,4 +1143,85 @@ if $rows != 20026 then
   return -1
 endi
 
+print ===================== TD-25209 test fill prev/next/linear after data range
+sql use $db
+
+sql select _wstart,_wend,count(*) from tm0 where ts >= '2020-01-01 01:03:06.000' and ts <= '2020-01-01 01:03:10.000' interval(1s) fill(prev);
+
+if $rows != 5 then
+  return -1
+endi
+
+if $data02 != NULL then
+  return -1
+endi
+
+if $data12 != 1 then
+  return -1
+endi
+
+if $data22 != 1 then
+  return -1
+endi
+
+if $data32 != 1 then
+  return -1
+endi
+
+if $data42 != 1 then
+  return -1
+endi
+
+sql select _wstart,_wend,count(*) from tm0 where ts >= '2020-01-01 01:03:06.000' and ts <= '2020-01-01 01:03:10.000' interval(1s) fill(next);
+
+if $rows != 5 then
+  return -1
+endi
+
+if $data02 != 1 then
+  return -1
+endi
+
+if $data12 != 1 then
+  return -1
+endi
+
+if $data22 != 1 then
+  return -1
+endi
+
+if $data32 != 1 then
+  return -1
+endi
+
+if $data42 != NULL then
+  return -1
+endi
+
+sql select _wstart,_wend,count(*) from tm0 where ts >= '2020-01-01 01:03:06.000' and ts <= '2020-01-01 01:03:10.000' interval(1s) fill(linear);
+
+if $rows != 5 then
+  return -1
+endi
+
+if $data02 != NULL then
+  return -1
+endi
+
+if $data12 != 1 then
+  return -1
+endi
+
+if $data22 != 1 then
+  return -1
+endi
+
+if $data32 != 1 then
+  return -1
+endi
+
+if $data42 != NULL then
+  return -1
+endi
+
 system sh/exec.sh -n dnode1 -s stop -x SIGINT