diff --git a/tests/pytest/concurrent_inquiry.py b/tests/pytest/concurrent_inquiry.py
index 8ae74c5c863a9dcb5521fc9447f51aa13e7c4c1d..52ae33cfa7918d1b138657d6446bcf36f0de6ee9 100644
--- a/tests/pytest/concurrent_inquiry.py
+++ b/tests/pytest/concurrent_inquiry.py
@@ -166,7 +166,7 @@ class ConcurrentInquiry:
         sel_col_list=[]
         col_rand=random.randint(0,len(col_list))
         for i,j in zip(col_list[0:col_rand],func_list):         #决定每个被查询col的函数
-            alias = 'as '+ str(i)
+            alias = ' as '+ str(i)
             pick_func = ''
             if j == 'leastsquares':
                 pick_func=j+'('+i+',1,1)'