diff --git a/tests/pytest/functions/function_stddev.py b/tests/pytest/functions/function_stddev.py
index afc59ac83d7156253225bf6c111e7b5f0e6f9dcb..3ff2b82bf6b326ed4d07a5a51027c9e266c2fd72 100644
--- a/tests/pytest/functions/function_stddev.py
+++ b/tests/pytest/functions/function_stddev.py
@@ -118,7 +118,11 @@ class TDTestCase:
             if i == 1 or i == 5 or i == 6 or i == 7 or i == 9 or i == 8 :continue
             tdSql.query('select stddev(c%d),stddev(c%d) from s group by c%d' %( i+1 , i+1 , i+1  ) )
         
-
+        #add for TD-3318
+        tdSql.execute('create table t1(ts timestamp, k int, b binary(12));')
+        tdSql.execute("insert into t1 values(now, 1, 'abc');")
+        tdLog.info("select stddev(k) from t1  where b <> 'abc' interval(1s);")
+        tdSql.query("select stddev(k) from t1  where b <> 'abc' interval(1s);")
         
             
     def stop(self):
diff --git a/tests/test-all.sh b/tests/test-all.sh
index b617dd2f075fe6d132b152525aa07b182b17201d..c8546f591a8d8030d940b8305d38def537ba3229 100755
--- a/tests/test-all.sh
+++ b/tests/test-all.sh
@@ -29,7 +29,7 @@ function dohavecore(){
   proc=`echo $corefile|cut -d "_" -f3`
   if [ -n "$corefile" ];then
     echo 'taosd or taos has generated core'
-    tar -zcvPf $corepath'taos_'`date "+%Y_%m_%d_%H_%M_%S"`.tar.gz /usr/local/taos/
+    tar -zcPf $corepath'taos_'`date "+%Y_%m_%d_%H_%M_%S"`.tar.gz 
     if [[ $1 == 1 ]];then
       echo '\n'|gdb /usr/local/taos/bin/$proc $core_file -ex "bt 10" -ex quit
       exit 8