test(query): add regress test case.

tests/script/tsim/parser/regressiontest.sim

@@ -63,4 +63,38 @@ if $rows != 8198 then
   return -1
 endi
 
+print ===========================>  TD-22077  && TD-21877
+sql drop database if exists $db -x step1
+sql create database $db vgroups 1;
+
+sql use $db
+sql create stable st1 (ts timestamp, c  int) tags(a  int);
+sql create table t1 using st1 tags(1);
+sql create table t2 using st1 tags(2);
+
+$i = 0
+$ts = 1674977959000
+$rowNum = 200
+
+$x = 0
+while $x < $rowNum
+$xs = $x * $delta
+$ts = $ts0 + $xs
+sql insert into t1 values ( $ts , $x )
+sql insert into t2 values ( $ts + 1000a, $x )
+$x = $x + 1
+$ts = $ts + 1000
+endw
+
+sql flush database $db
+
+sql insert into t1 values('2018-09-17 09:00:26', 26);
+sql insert into t2 values('2018-09-17 09:00:25', 25);
+
+sql insert into t2 values('2018-09-17 09:00:30', 30);
+sql flush  database reg_db0;
+
+sql delete from st1 where ts<='2018-9-17 09:00:26';
+sql select * from st1;
+
 system sh/exec.sh -n dnode1 -s stop -x SIGINT