add test case

tests/script/general/parser/select_distinct_tag.sim

+system sh/stop_dnodes.sh
+
+system sh/deploy.sh -n dnode1 -i 1
+system sh/cfg.sh -n dnode1 -c walLevel -v 0
+system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 5
+system sh/exec.sh -n dnode1 -s start
+sleep 100
+sql connect
+
+$dbPrefix = sav_db
+$tbPrefix = sav_tb
+$stbPrefix = sav_stb
+$tbNum = 20
+$rowNum = 10
+$totalNum = $tbNum * $rowNum
+$ts0 = 1537146000000
+$delta = 600000
+print ========== alter.sim
+$i = 0
+$db = $dbPrefix
+$stb = $stbPrefix
+
+sql drop database if exists $db
+sql create database $db
+sql use $db
+print ====== create tables
+sql create table $stb (ts timestamp, c1 int, c2 bigint, c3 float, c4 double, c5 smallint, c6 tinyint, c7 bool, c8 binary(10), c9 nchar(10)) tags(t1 int, t2 int)
+
+$i = 0
+$ts = $ts0
+while $i < $tbNum
+  $tb = $tbPrefix . $i
+  sql create table $tb using $stb tags( $i , 0 )
+  $i = $i + 1
+endw 
+
+print ====== table created  
+
+#### select distinct tag
+sql select distinct t1 from $stb
+if $rows != $tbNum then
+  return -1
+endi
+
+#### select distinct tag
+sql select distinct t2 from $stb
+if $rows != 1 then
+  print $rows
+  return -1
+endi
+
+#### unsupport sql
+sql_error select distinct t1, t2 from &stb
+
+sql drop database $db
+sql show databases
+if $rows != 0 then 
+  return -1
+endi
+
+system sh/exec.sh -n dnode1 -s stop -x SIGINT

tests/script/jenkins/basic.txt

@@ -159,6 +159,7 @@ cd ../../../debug; make
 ./test.sh -f general/parser/union.sim
 ./test.sh -f general/parser/topbot.sim
 ./test.sh -f general/parser/function.sim
+./test.sh -f general/parser/select_distinct_tag.sim
 
 ./test.sh -f general/stable/disk.sim
 ./test.sh -f general/stable/dnode3.sim