diff --git a/include/libs/scalar/scalar.h b/include/libs/scalar/scalar.h
index b667207684ede1d054ee5ff9d4b8f5574137aaf8..770b0442ea5413399b543545369246cf5346875b 100644
--- a/include/libs/scalar/scalar.h
+++ b/include/libs/scalar/scalar.h
@@ -117,8 +117,12 @@ int32_t diffScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam
 int32_t stateCountScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
 int32_t stateDurationScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
 int32_t histogramScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
-int32_t topScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
-int32_t bottomScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
+int32_t topBotScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
+int32_t firstLastScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
+int32_t sampleScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
+int32_t tailScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
+int32_t uniqueScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
+int32_t modeScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput);
 
 #ifdef __cplusplus
 }
diff --git a/source/dnode/mnode/impl/src/mndSubscribe.c b/source/dnode/mnode/impl/src/mndSubscribe.c
index d67e4e8783f107a2dc2333e32151380456f22b81..05e197150eb3fe099574d1f15a868a92305b007a 100644
--- a/source/dnode/mnode/impl/src/mndSubscribe.c
+++ b/source/dnode/mnode/impl/src/mndSubscribe.c
@@ -298,7 +298,8 @@ static int32_t mndDoRebalance(SMnode *pMnode, const SMqRebInputObj *pInput, SMqR
                 .pVgEp = pVgEp,
             };
             taosHashPut(pHash, &pVgEp->vgId, sizeof(int32_t), &outputVg, sizeof(SMqRebOutputVg));
-            mInfo("mq rebalance: remove vgId:%d from consumer:%" PRId64 ",(first scan)", pVgEp->vgId, pConsumerEp->consumerId);
+            mInfo("mq rebalance: remove vgId:%d from consumer:%" PRId64 ",(first scan)", pVgEp->vgId,
+                  pConsumerEp->consumerId);
           }
           imbCnt++;
         }
@@ -312,7 +313,8 @@ static int32_t mndDoRebalance(SMnode *pMnode, const SMqRebInputObj *pInput, SMqR
               .pVgEp = pVgEp,
           };
           taosHashPut(pHash, &pVgEp->vgId, sizeof(int32_t), &outputVg, sizeof(SMqRebOutputVg));
-          mInfo("mq rebalance: remove vgId:%d from consumer:%" PRId64 ",(first scan)", pVgEp->vgId, pConsumerEp->consumerId);
+          mInfo("mq rebalance: remove vgId:%d from consumer:%" PRId64 ",(first scan)", pVgEp->vgId,
+                pConsumerEp->consumerId);
         }
       }
     }
@@ -354,7 +356,8 @@ static int32_t mndDoRebalance(SMnode *pMnode, const SMqRebInputObj *pInput, SMqR
       taosArrayPush(pConsumerEp->vgs, &pRebVg->pVgEp);
       pRebVg->newConsumerId = pConsumerEp->consumerId;
       taosArrayPush(pOutput->rebVgs, pRebVg);
-      mInfo("mq rebalance: add vgId:%d to consumer:%" PRId64 ",(second scan)", pRebVg->pVgEp->vgId, pConsumerEp->consumerId);
+      mInfo("mq rebalance: add vgId:%d to consumer:%" PRId64 ",(second scan)", pRebVg->pVgEp->vgId,
+            pConsumerEp->consumerId);
     }
   }
 
@@ -371,8 +374,14 @@ static int32_t mndDoRebalance(SMnode *pMnode, const SMqRebInputObj *pInput, SMqR
       ASSERT(pConsumerEp->consumerId > 0);
       taosArrayPush(pConsumerEp->vgs, &pRebVg->pVgEp);
       pRebVg->newConsumerId = pConsumerEp->consumerId;
+      if (pRebVg->newConsumerId == pRebVg->oldConsumerId) {
+        mInfo("mq rebalance: skip vg %d for same consumer:%" PRId64 ",(second scan)", pRebVg->pVgEp->vgId,
+              pConsumerEp->consumerId);
+        continue;
+      }
       taosArrayPush(pOutput->rebVgs, pRebVg);
-      mInfo("mq rebalance: add vgId:%d to consumer:%" PRId64 ",(second scan)", pRebVg->pVgEp->vgId, pConsumerEp->consumerId);
+      mInfo("mq rebalance: add vgId:%d to consumer:%" PRId64 ",(second scan)", pRebVg->pVgEp->vgId,
+            pConsumerEp->consumerId);
     }
   } else {
     // if all consumer is removed, put all vg into unassigned
diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index b6a351b4a67fc4fee667166b139252d373915c44..489a11da395a5ffba9e8c552e200286aeccd6f5d 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -2086,7 +2086,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getTopBotFuncEnv,
     .initFunc     = topBotFunctionSetup,
     .processFunc  = topFunction,
-    .sprocessFunc = topScalarFunction,
+    .sprocessFunc = topBotScalarFunction,
     .finalizeFunc = topBotFinalize,
     .combineFunc  = topCombine,
     .pPartialFunc = "top",
@@ -2101,7 +2101,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getTopBotFuncEnv,
     .initFunc     = topBotFunctionSetup,
     .processFunc  = bottomFunction,
-    .sprocessFunc = bottomScalarFunction,
+    .sprocessFunc = topBotScalarFunction,
     .finalizeFunc = topBotFinalize,
     .combineFunc  = bottomCombine,
     .pPartialFunc = "bottom",
@@ -2231,6 +2231,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getFirstLastFuncEnv,
     .initFunc     = functionSetup,
     .processFunc  = lastRowFunction,
+    .sprocessFunc = firstLastScalarFunction,
     .finalizeFunc = firstLastFinalize
   },
   {
@@ -2251,6 +2252,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getFirstLastFuncEnv,
     .initFunc     = functionSetup,
     .processFunc  = firstFunction,
+    .sprocessFunc = firstLastScalarFunction,
     .finalizeFunc = firstLastFinalize,
     .pPartialFunc = "_first_partial",
     .pMergeFunc   = "_first_merge",
@@ -2286,6 +2288,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getFirstLastFuncEnv,
     .initFunc     = functionSetup,
     .processFunc  = lastFunction,
+    .sprocessFunc = firstLastScalarFunction,
     .finalizeFunc = firstLastFinalize,
     .pPartialFunc = "_last_partial",
     .pMergeFunc   = "_last_merge",
@@ -2466,6 +2469,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getSampleFuncEnv,
     .initFunc     = sampleFunctionSetup,
     .processFunc  = sampleFunction,
+    .sprocessFunc = sampleScalarFunction,
     .finalizeFunc = sampleFinalize
   },
   {
@@ -2477,6 +2481,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getTailFuncEnv,
     .initFunc     = tailFunctionSetup,
     .processFunc  = tailFunction,
+    .sprocessFunc = tailScalarFunction,
     .finalizeFunc = NULL
   },
   {
@@ -2488,6 +2493,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getUniqueFuncEnv,
     .initFunc     = uniqueFunctionSetup,
     .processFunc  = uniqueFunction,
+    .sprocessFunc = uniqueScalarFunction,
     .finalizeFunc = NULL
   },
   {
@@ -2498,6 +2504,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getModeFuncEnv,
     .initFunc     = modeFunctionSetup,
     .processFunc  = modeFunction,
+    .sprocessFunc = modeScalarFunction,
     .finalizeFunc = modeFinalize,
   },
   {
diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index 1cbaf9690ed03a937524dbefc49beba3906c145e..55debe51a8d2b1455c8c5fb5e5636649c52ba2b8 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -2838,10 +2838,26 @@ int32_t selectScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarPara
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t topScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
+int32_t topBotScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
   return selectScalarFunction(pInput, inputNum, pOutput);
 }
 
-int32_t bottomScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
+int32_t firstLastScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
+  return selectScalarFunction(pInput, inputNum, pOutput);
+}
+
+int32_t sampleScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
+  return selectScalarFunction(pInput, inputNum, pOutput);
+}
+
+int32_t tailScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
+  return selectScalarFunction(pInput, inputNum, pOutput);
+}
+
+int32_t uniqueScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
+  return selectScalarFunction(pInput, inputNum, pOutput);
+}
+
+int32_t modeScalarFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
   return selectScalarFunction(pInput, inputNum, pOutput);
 }
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index f6eb9e32f28e18a75379ea0d789d9246f67fabe2..b59a8126786db7f0db18a3bbc86a0e8c734abfee 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -143,76 +143,80 @@ int32_t streamPipelineExec(SStreamTask* pTask, int32_t batchNum) {
 }
 
 static SArray* streamExecForQall(SStreamTask* pTask, SArray* pRes) {
-  int32_t cnt = 0;
-  void*   data = NULL;
   while (1) {
-    SStreamQueueItem* qItem = streamQueueNextItem(pTask->inputQueue);
-    if (qItem == NULL) {
-      qDebug("stream exec over, queue empty");
-      break;
-    }
-    if (data == NULL) {
-      data = qItem;
-      if (qItem->type == STREAM_INPUT__DATA_BLOCK) {
-        /*streamUpdateVer(pTask, (SStreamDataBlock*)qItem);*/
-      }
-      streamQueueProcessSuccess(pTask->inputQueue);
-    } else {
-      if (streamAppendQueueItem(data, qItem) < 0) {
-        streamQueueProcessFail(pTask->inputQueue);
+    int32_t cnt = 0;
+    void*   data = NULL;
+    while (1) {
+      SStreamQueueItem* qItem = streamQueueNextItem(pTask->inputQueue);
+      if (qItem == NULL) {
+        qDebug("stream exec over, queue empty");
         break;
-      } else {
-        cnt++;
-        /*streamUpdateVer(pTask, (SStreamDataBlock*)qItem);*/
+      }
+      if (data == NULL) {
+        data = qItem;
         streamQueueProcessSuccess(pTask->inputQueue);
-        taosArrayDestroy(((SStreamDataBlock*)qItem)->blocks);
-        taosFreeQitem(qItem);
+        if (qItem->type == STREAM_INPUT__DATA_BLOCK) {
+          /*streamUpdateVer(pTask, (SStreamDataBlock*)qItem);*/
+        } else {
+          break;
+        }
+      } else {
+        if (streamAppendQueueItem(data, qItem) < 0) {
+          streamQueueProcessFail(pTask->inputQueue);
+          break;
+        } else {
+          cnt++;
+          /*streamUpdateVer(pTask, (SStreamDataBlock*)qItem);*/
+          streamQueueProcessSuccess(pTask->inputQueue);
+          taosArrayDestroy(((SStreamDataBlock*)qItem)->blocks);
+          taosFreeQitem(qItem);
+        }
       }
     }
-  }
-  if (pTask->taskStatus == TASK_STATUS__DROPPING) {
-    if (data) streamFreeQitem(data);
-    taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
-    return NULL;
-  }
+    if (pTask->taskStatus == TASK_STATUS__DROPPING) {
+      if (data) streamFreeQitem(data);
+      taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
+      return NULL;
+    }
 
-  if (data == NULL) return pRes;
+    if (data == NULL) break;
 
-  if (pTask->execType == TASK_EXEC__NONE) {
-    ASSERT(((SStreamQueueItem*)data)->type == STREAM_INPUT__DATA_BLOCK);
-    streamTaskOutput(pTask, data);
-    return pRes;
-  }
+    if (pTask->execType == TASK_EXEC__NONE) {
+      ASSERT(((SStreamQueueItem*)data)->type == STREAM_INPUT__DATA_BLOCK);
+      streamTaskOutput(pTask, data);
+      return pRes;
+    }
 
-  qDebug("stream task %d exec begin, msg batch: %d", pTask->taskId, cnt);
-  streamTaskExecImpl(pTask, data, pRes);
-  qDebug("stream task %d exec end", pTask->taskId);
+    qDebug("stream task %d exec begin, msg batch: %d", pTask->taskId, cnt);
+    streamTaskExecImpl(pTask, data, pRes);
+    qDebug("stream task %d exec end", pTask->taskId);
 
-  if (taosArrayGetSize(pRes) != 0) {
-    SStreamDataBlock* qRes = taosAllocateQitem(sizeof(SStreamDataBlock), DEF_QITEM);
-    if (qRes == NULL) {
-      streamQueueProcessFail(pTask->inputQueue);
-      taosArrayDestroy(pRes);
-      return NULL;
-    }
-    qRes->type = STREAM_INPUT__DATA_BLOCK;
-    qRes->blocks = pRes;
-    if (streamTaskOutput(pTask, qRes) < 0) {
-      /*streamQueueProcessFail(pTask->inputQueue);*/
-      taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
-      taosFreeQitem(qRes);
-      return NULL;
-    }
-    if (((SStreamQueueItem*)data)->type == STREAM_INPUT__DATA_SUBMIT) {
-      SStreamDataSubmit* pSubmit = (SStreamDataSubmit*)data;
-      qRes->childId = pTask->selfChildId;
-      qRes->sourceVer = pSubmit->ver;
+    if (taosArrayGetSize(pRes) != 0) {
+      SStreamDataBlock* qRes = taosAllocateQitem(sizeof(SStreamDataBlock), DEF_QITEM);
+      if (qRes == NULL) {
+        streamQueueProcessFail(pTask->inputQueue);
+        taosArrayDestroy(pRes);
+        return NULL;
+      }
+      qRes->type = STREAM_INPUT__DATA_BLOCK;
+      qRes->blocks = pRes;
+      if (streamTaskOutput(pTask, qRes) < 0) {
+        /*streamQueueProcessFail(pTask->inputQueue);*/
+        taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
+        taosFreeQitem(qRes);
+        return NULL;
+      }
+      if (((SStreamQueueItem*)data)->type == STREAM_INPUT__DATA_SUBMIT) {
+        SStreamDataSubmit* pSubmit = (SStreamDataSubmit*)data;
+        qRes->childId = pTask->selfChildId;
+        qRes->sourceVer = pSubmit->ver;
+      }
+      /*streamQueueProcessSuccess(pTask->inputQueue);*/
+      pRes = taosArrayInit(0, sizeof(SSDataBlock));
     }
-    /*streamQueueProcessSuccess(pTask->inputQueue);*/
-    pRes = taosArrayInit(0, sizeof(SSDataBlock));
-  }
 
-  streamFreeQitem(data);
+    streamFreeQitem(data);
+  }
   return pRes;
 }
 
diff --git a/source/libs/wal/src/walRead.c b/source/libs/wal/src/walRead.c
index 908523f2a66f50c081152752fc5cafb28b8eebae..c47964803a812c3013b14b44c374496799b440b1 100644
--- a/source/libs/wal/src/walRead.c
+++ b/source/libs/wal/src/walRead.c
@@ -483,6 +483,7 @@ int32_t walReadVer(SWalReader *pRead, int64_t ver) {
            pRead->pHead->head.version, ver);
     pRead->curInvalid = 1;
     terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
+    ASSERT(0);
     return -1;
   }
 
@@ -491,6 +492,7 @@ int32_t walReadVer(SWalReader *pRead, int64_t ver) {
     wError("vgId:%d, unexpected wal log index:%" PRId64 ", since body checksum not passed", pRead->pWal->cfg.vgId, ver);
     pRead->curInvalid = 1;
     terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
+    ASSERT(0);
     return -1;
   }
   pRead->curVersion++;