[td-225] fix bugs in sliding query

src/query/src/qExecutor.c

@@ -685,7 +685,6 @@ static void doBlockwiseApplyFunctions(SQueryRuntimeEnv *pRuntimeEnv, SWindowStat
   SQuery *        pQuery = pRuntimeEnv->pQuery;
   SQLFunctionCtx *pCtx = pRuntimeEnv->pCtx;
 
-  if (IS_MASTER_SCAN(pRuntimeEnv) || pStatus->closed) {
   for (int32_t k = 0; k < pQuery->numOfOutput; ++k) {
     int32_t functionId = pQuery->pSelectExpr[k].base.functionId;
 
@@ -706,7 +705,6 @@ static void doBlockwiseApplyFunctions(SQueryRuntimeEnv *pRuntimeEnv, SWindowStat
       aAggs[functionId].xFunction(&pCtx[k]);
     }
   }
-  }
 }
 
 static void doRowwiseApplyFunctions(SQueryRuntimeEnv *pRuntimeEnv, SWindowStatus *pStatus, STimeWindow *pWin,
@@ -1087,6 +1085,11 @@ static bool functionNeedToExecute(SQueryRuntimeEnv *pRuntimeEnv, SQLFunctionCtx
   SResultInfo *pResInfo = GET_RES_INFO(pCtx);
   SQuery* pQuery = pRuntimeEnv->pQuery;
 
+  // in case of timestamp column, always generated results.
+  if (functionId == TSDB_FUNC_TS) {
+    return true;
+  }
+  
   if (pResInfo->complete || functionId == TSDB_FUNC_TAG_DUMMY || functionId == TSDB_FUNC_TS_DUMMY) {
     return false;
   }
@@ -4716,6 +4719,7 @@ static void multiTableQueryProcess(SQInfo *pQInfo) {
     qDebug("QInfo:%p reversed scan completed, elapsed time: %" PRId64 "ms", pQInfo, el);
 
     doRestoreContext(pQInfo);
+    doCloseAllTimeWindowAfterScan(pQInfo);
   } else {
     qDebug("QInfo:%p no need to do reversed scan, query completed", pQInfo);
   }