diff --git a/Jenkinsfile b/Jenkinsfile
index 685fde662db40c234cd160dd4334d91df75e5a1a..a78851fd900339b473e6f5df65a0160d25a47331 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -24,7 +24,13 @@ def abortPreviousBuilds() {
     build.doKill()    //doTerm(),doKill(),doTerm()
   }
 }
-
+//abort previous build
+abortPreviousBuilds()
+def abort_previous(){
+  def buildNumber = env.BUILD_NUMBER as int
+  if (buildNumber > 1) milestone(buildNumber - 1)
+  milestone(buildNumber)
+}
 def pre_test(){
     catchError(buildResult: 'SUCCESS', stageResult: 'FAILURE') {
                 sh '''
diff --git a/tests/pytest/functions/function_operations.py b/tests/pytest/functions/function_operations.py
index 4f126371b9afa7d29ca697cb09acc2e4f16d232e..162aa3eb658a60615c9f20de0c363f9066096f0c 100644
--- a/tests/pytest/functions/function_operations.py
+++ b/tests/pytest/functions/function_operations.py
@@ -92,7 +92,7 @@ class TDTestCase:
         col_list = [ 'col1' , 'col2' , 'col3' , 'col4' , 'col5' , 'col6' , 'col7' , 'col8' , 'col9' , 'col11' , 'col12' , 'col13' , 'col14' , '1' , '1.1' , 'NULL' ]
         op_list = [ '+' , '-' , '*' , '/' , '%' ]
         err_list = [ 'col7' , 'col8' , 'col9' , 'NULL' ]
-        order_lsit = [ ' order by ts ', ' order by ts desc ', ' order by ts asc']
+        order_lsit = [ ' order by ts ', ' order by ts desc ', ' order by ts asc ']
         for i in col_list :
             for j in col_list :
                 for k in op_list :