add diff... group by check

src/client/src/tscSQLParser.c

@@ -6520,6 +6520,7 @@ int32_t doFunctionsCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, char*
   const char* msg3 = "group by/session/state_window not allowed on projection query";
   const char* msg4 = "retrieve tags not compatible with group by or interval query";
   const char* msg5 = "functions can not be mixed up";
+  const char* msg6 = "TWA/Diff/Derivative/Irate only support group by tbname";
 
   // only retrieve tags, group by is not supportted
   if (tscQueryTags(pQueryInfo)) {
@@ -6571,6 +6572,15 @@ int32_t doFunctionsCompatibleCheck(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, char*
         }
       }
 
+      if (f == TSDB_FUNC_DIFF || f == TSDB_FUNC_DERIVATIVE || f == TSDB_FUNC_TWA || f == TSDB_FUNC_IRATE) {
+        for (int32_t j = 0; j < pQueryInfo->groupbyExpr.numOfGroupCols; ++j) {
+          SColIndex* pColIndex = taosArrayGet(pQueryInfo->groupbyExpr.columnInfo, j);
+          if (pColIndex->colIndex != TSDB_TBNAME_COLUMN_INDEX) {
+            return invalidOperationMsg(msg, msg6);
+          }
+        }
+      }
+
       if (IS_MULTIOUTPUT(aAggs[f].status) && f != TSDB_FUNC_TOP && f != TSDB_FUNC_BOTTOM &&
           f != TSDB_FUNC_DIFF && f != TSDB_FUNC_DERIVATIVE && f != TSDB_FUNC_TAGPRJ && f != TSDB_FUNC_PRJ) {
         return invalidOperationMsg(msg, msg1);

src/query/src/qExecutor.c

@@ -1408,8 +1408,9 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SGroupbyOperatorInfo *pIn
     }
 
     doApplyFunctions(pRuntimeEnv, pInfo->binfo.pCtx, &w, pSDataBlock->info.rows - num, num, tsList, pSDataBlock->info.rows, pOperator->numOfOutput);
-    tfree(pInfo->prevData);
   }
+
+  tfree(pInfo->prevData);
 }
 
 static void doSessionWindowAggImpl(SOperatorInfo* pOperator, SSWindowOperatorInfo *pInfo, SSDataBlock *pSDataBlock) {