fix bug

src/client/src/tscSubquery.c

@@ -1880,6 +1880,13 @@ void doAppendData(SInterResult* pInterResult, TAOS_ROW row, int32_t numOfCols, S
       }
     }
 
+    if (p && taosArrayGetSize(p) > 0) {
+      SResPair *l = taosArrayGetLast(p);
+      if (l->key == key && key == INT64_MIN) {
+        continue;
+      }
+    }
+
     //append a new column
     if (p == NULL) {
       SStddevInterResult t = {.colId = id, .pResult = taosArrayInit(10, sizeof(SResPair)),};

tests/script/general/parser/groupby.sim

@@ -610,6 +610,11 @@ print =================>TD-2665
 sql_error create table txx as select avg(c) as t from st;
 sql_error create table txx1 as select avg(c) as t from t1;
 
+sql select stddev(c),stddev(c) from st group by c;
+if $rows != 4 then
+  return -1
+endi
+
 print =================>TD-2236
 sql select first(ts),last(ts) from t1 group by c;
 if $rows != 4 then