fix: avoid filter slow when filter not exist value

tests/script/tsim/tagindex/add_index.sim

@@ -7,7 +7,7 @@ print ======== step0
 $dbPrefix = ta_3_db
 $tbPrefix = ta_3_tb
 $mtPrefix = ta_3_mt
-$tbNum = 100 
+$tbNum = 500 
 $rowNum = 20
 $totalNum = 200
 
@@ -26,9 +26,10 @@ endi
 print =============== create child table
 
 $i = 0 
+$val = 1
 while $i < $tbNum 
     $tb = $tbPrefix . $i 
-    sql create table $tb using $mtPrefix tags( $i , $i , $i , $i , $i );
+    sql create table $tb using $mtPrefix tags( $i , $i , $i , $i , $val );
     $i = $i + 1
 endw
 
@@ -49,6 +50,7 @@ endw
 
 
 sql create index ti2 on $mtPrefix (t2)
+sql create index ti5 on $mtPrefix (t5)
 
 print ==== test name conflict
 # 
@@ -120,6 +122,53 @@ while $i < $tbNum
   $i = $i + 1
 endw
 
+
+
+# test special boundary condtion 
+print ===== test operator low on ti5 
+# great equal than 
+sql select * from $mtPrefix where t5 < 0 ;
+if $rows != 0 then
+  return -1
+endi
+
+print ===== test operator lower equal on ti5 
+# great equal than 
+sql select * from $mtPrefix where t5 <= $val ;
+if $rows != $tbNum then
+  return -1
+endi
+
+print ===== test operator equal on ti5 
+# great equal than 
+sql select * from $mtPrefix where t5 = $val ;
+if $rows != $tbNum then
+  return -1
+endi
+
+print ===== test operator great equal on ti5 
+# great equal than 
+sql select * from $mtPrefix where t5 >= $val ;
+if $rows != $tbNum then
+  return -1
+endi
+
+print ===== test operator great than on ti5 
+# great equal than 
+sql select * from $mtPrefix where t5 > $val ;
+if $rows != 0 then
+  return -1
+endi
+
+print ===== test operator great on ti5 
+# great equal than 
+sql select * from $mtPrefix where t5 > $val + 1 ;
+if $rows != 0 then
+  return -1
+endi
+
+sql drop index ti5
+
 print ===== add table after index created
 $interval = $tbNum + $tbNum 
 $i = $interval  
@@ -130,8 +179,6 @@ while $i < $limit
     $i = $i + 1
 endw
 
-
-
 print ===== add table after index created (opeator  great equal than)
 # great equal than 
 $i = $interval