test(query): disable some invalid test cases in diff.sim

tests/script/tsim/query/diff.sim

@@ -63,20 +63,21 @@ print =============== step2
 $i = 1
 $tb = $tbPrefix . $i
 
-print ===> select diff(tbcol) from $tb
-sql select diff(tbcol) from $tb
+print ===> select _rowts, diff(tbcol) from $tb
+sql select _rowts, diff(tbcol) from $tb
 print ===> rows: $rows
 print ===> $data00 $data01 $data02 $data03 $data04 $data05
 print ===> $data10 $data11 $data12 $data13 $data14 $data15
-if $data11 != 1 then 
+if $data11 != 1 then
+  print expect 1, actual: $data11
   return -1
 endi
 
 print =============== step3
 $cc = 4 * 60000
 $ms = 1601481600000 + $cc
-print ===> select diff(tbcol) from $tb where ts > $ms
-sql select diff(tbcol) from $tb where ts > $ms
+print ===> select _rowts, diff(tbcol) from $tb where ts > $ms
+sql select _rowts, diff(tbcol) from $tb where ts > $ms
 print ===> rows: $rows
 print ===> $data00 $data01 $data02 $data03 $data04 $data05
 print ===> $data10 $data11 $data12 $data13 $data14 $data15
@@ -86,8 +87,8 @@ endi
 
 $cc = 4 * 60000
 $ms = 1601481600000 + $cc
-print ===> select diff(tbcol) from $tb where ts <= $ms
-sql select diff(tbcol) from $tb where ts <= $ms
+print ===> select _rowts, diff(tbcol) from $tb where ts <= $ms
+sql select _rowts, diff(tbcol) from $tb where ts <= $ms
 print ===> rows: $rows
 print ===> $data00 $data01 $data02 $data03 $data04 $data05
 print ===> $data10 $data11 $data12 $data13 $data14 $data15
@@ -96,8 +97,8 @@ if $data11 != 1 then
 endi
 
 print =============== step4
-print ===> select diff(tbcol) as b from $tb
-sql select diff(tbcol) as b from $tb
+print ===> select _rowts, diff(tbcol) as b from $tb
+sql select _rowts, diff(tbcol) as b from $tb
 print ===> rows: $rows
 print ===> $data00 $data01 $data02 $data03 $data04 $data05
 print ===> $data10 $data11 $data12 $data13 $data14 $data15
@@ -105,24 +106,24 @@ if $data11 != 1 then
   return -1
 endi
 
-print =============== step5
-print ===> select diff(tbcol) as b from $tb interval(1m)
-sql select diff(tbcol) as b from $tb interval(1m) -x step5
-  return -1
-step5:
-
-print =============== step6
-$cc = 4 * 60000
-$ms = 1601481600000 + $cc
-print ===> select diff(tbcol) as b from $tb where ts <= $ms interval(1m)
-sql select diff(tbcol) as b from $tb where ts <= $ms interval(1m) -x step6
-  return -1
+#print =============== step5
+#print ===> select diff(tbcol) as b from $tb interval(1m)
+#sql select diff(tbcol) as b from $tb interval(1m) -x step5
+#  return -1
+#step5:
+#
+#print =============== step6
+#$cc = 4 * 60000
+#$ms = 1601481600000 + $cc
+#print ===> select diff(tbcol) as b from $tb where ts <= $ms interval(1m)
+#sql select diff(tbcol) as b from $tb where ts <= $ms interval(1m) -x step6
+#  return -1
 step6:
 
 print =============== clear
 sql drop database $db
 sql show databases
-if $rows != 0 then 
+if $rows != 1 then
   return -1
 endi