refactor: set filter function for last_row function.

source/libs/executor/src/scanoperator.c

@@ -521,7 +521,7 @@ static SSDataBlock* doTableScanGroup(SOperatorInfo* pOperator) {
     if (pTableScanInfo->scanTimes < pTableScanInfo->scanInfo.numOfAsc) {
       setTaskStatus(pTaskInfo, TASK_NOT_COMPLETED);
       pTableScanInfo->scanFlag = REPEAT_SCAN;
-      qDebug("%s start to repeat ascending order scan data blocks due to query func required", GET_TASKID(pTaskInfo));
+      qDebug("%s start to repeat ascending order scan data SELECT last_row(*),hostname from cpu group by hostname;blocks due to query func required", GET_TASKID(pTaskInfo));
 
       // do prepare for the next round table scan operation
       tsdbReaderReset(pTableScanInfo->dataReader, &pTableScanInfo->cond);
@@ -533,10 +533,9 @@ static SSDataBlock* doTableScanGroup(SOperatorInfo* pOperator) {
     if (pTableScanInfo->cond.order == TSDB_ORDER_ASC) {
       prepareForDescendingScan(pTableScanInfo, pOperator->exprSupp.pCtx, 0);
       tsdbReaderReset(pTableScanInfo->dataReader, &pTableScanInfo->cond);
+      qDebug("%s start to descending order scan data blocks due to query func required", GET_TASKID(pTaskInfo));
     }
 
-    qDebug("%s start to descending order scan data blocks due to query func required", GET_TASKID(pTaskInfo));
-
     while (pTableScanInfo->scanTimes < total) {
       SSDataBlock* p = doTableScanImpl(pOperator);
       if (p != NULL) {

source/libs/function/src/builtins.c

@@ -2271,6 +2271,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .type = FUNCTION_TYPE_LAST_ROW,
     .classification = FUNC_MGT_AGG_FUNC | FUNC_MGT_MULTI_RES_FUNC | FUNC_MGT_SELECT_FUNC | FUNC_MGT_IMPLICIT_TS_FUNC,
     .translateFunc = translateFirstLast,
+    .dynDataRequiredFunc = lastDynDataReq,
     .getEnvFunc   = getFirstLastFuncEnv,
     .initFunc     = functionSetup,
     .processFunc  = lastRowFunction,