update case for all

tests/system-test/2-query/mavg.py

@@ -288,15 +288,17 @@ class TDTestCase:
         else:
             tdSql.query(f"select {col} from {table_expr} {re.sub('limit [0-9]*|offset [0-9]*','',condition)}")
             offset_val = condition.split("offset")[1].split(" ")[1] if "offset" in condition else 0
+            # print(f"select {col} from {table_expr} {re.sub('limit [0-9]*|offset [0-9]*','',condition)}")
             pre_result = np.array(tdSql.queryResult)[np.array(tdSql.queryResult) != None]
-            pre_mavg = pre_mavg = np.convolve(pre_result, np.ones(k), "valid")[offset_val:]/k
-            tdSql.query(self.mavg_query_form(
-                sel=sel, func=func, col=col, m_comm=m_comm, k=k, r_comm=r_comm, alias=alias, fr=fr,
-                table_expr=table_expr, condition=condition
-            ))
-            for i in range(tdSql.queryRows):
-                print(f"case in {line}: ", end='')
-                tdSql.checkData(i, 0, pre_mavg[i])
+            if pre_result is pre_result.any:
+                pre_mavg = pre_mavg = np.convolve(pre_result, np.ones(k), "valid")[offset_val:]/k
+                tdSql.query(self.mavg_query_form(
+                    sel=sel, func=func, col=col, m_comm=m_comm, k=k, r_comm=r_comm, alias=alias, fr=fr,
+                    table_expr=table_expr, condition=condition
+                ))
+                for i in range(tdSql.queryRows):
+                    print(f"case in {line}: ", end='')
+                    tdSql.checkData(i, 0, pre_mavg[i])
 
         pass