Merge pull request #5238 from taosdata/hotfix/TD-3019

[TD-3019]stddev and group by with same column issue

src/client/src/tscSubquery.c

@@ -1848,7 +1848,7 @@ void doAppendData(SInterResult* pInterResult, TAOS_ROW row, int32_t numOfCols, S
   TSKEY key = INT64_MIN;
   for(int32_t i = 0; i < numOfCols; ++i) {
     SSqlExpr* pExpr = tscSqlExprGet(pQueryInfo, i);
-    if (TSDB_COL_IS_TAG(pExpr->colInfo.flag)) {
+    if (TSDB_COL_IS_TAG(pExpr->colInfo.flag) || pExpr->functionId == TSDB_FUNC_PRJ) {
       continue;
     }
 

tests/script/general/parser/function.sim

@@ -763,3 +763,20 @@ endi
 if $data01 != 1.414213562 then
   return -1
 endi
+
+sql create stable st1 (ts timestamp, f1 int, f2 int) tags (id int);
+sql create table tb1 using st1 tags(1);
+
+sql insert into tb1 values (now, 1, 1);
+
+sql select stddev(f1) from st1 group by f1;
+
+if $rows != 1 then
+  return -1
+endi
+
+
+if $data00 != 0.000000000 then
+  return -1
+endi
+