diff --git a/source/libs/function/src/functionMgt.c b/source/libs/function/src/functionMgt.c
index 611ae8d81fdc681c28936456b5b46c0a7e09d4c0..67efdc5c0b91266500e3146b3c2d76350f28087d 100644
--- a/source/libs/function/src/functionMgt.c
+++ b/source/libs/function/src/functionMgt.c
@@ -226,6 +226,9 @@ static SColumnNode* createColumnByFunc(const SFunctionNode* pFunc) {
 }
 
 bool fmIsDistExecFunc(int32_t funcId) {
+  if (fmIsUserDefinedFunc(funcId)) {
+    return false;
+  }
   if (!fmIsVectorFunc(funcId)) {
     return true;
   }
diff --git a/source/libs/planner/src/planSpliter.c b/source/libs/planner/src/planSpliter.c
index e3c8b82e3988bd7943815a645332920f9d31d08b..3aad68ae7d5f3f980ec210d5a8a5a6348d6742a2 100644
--- a/source/libs/planner/src/planSpliter.c
+++ b/source/libs/planner/src/planSpliter.c
@@ -151,8 +151,8 @@ static bool stbSplHasMultiTbScan(bool streamQuery, SLogicNode* pNode) {
 
 static bool stbSplNeedSplit(bool streamQuery, SLogicNode* pNode) {
   switch (nodeType(pNode)) {
-    // case QUERY_NODE_LOGIC_PLAN_AGG:
-    //   return !stbSplHasGatherExecFunc(((SAggLogicNode*)pNode)->pAggFuncs) && stbSplHasMultiTbScan(pNode);
+    case QUERY_NODE_LOGIC_PLAN_AGG:
+      return !stbSplHasGatherExecFunc(((SAggLogicNode*)pNode)->pAggFuncs) && stbSplHasMultiTbScan(streamQuery, pNode);
     case QUERY_NODE_LOGIC_PLAN_WINDOW: {
       SWindowLogicNode* pWindow = (SWindowLogicNode*)pNode;
       if (WINDOW_TYPE_INTERVAL != pWindow->winType) {
@@ -365,6 +365,66 @@ static int32_t stbSplSplitWindowNode(SSplitContext* pCxt, SStableSplitInfo* pInf
   }
 }
 
+static int32_t stbSplCreatePartAggNode(SAggLogicNode* pMergeAgg, SLogicNode** pOutput) {
+  SNodeList* pFunc = pMergeAgg->pAggFuncs;
+  pMergeAgg->pAggFuncs = NULL;
+  SNodeList* pGroupKeys = pMergeAgg->pGroupKeys;
+  pMergeAgg->pGroupKeys = NULL;
+  SNodeList* pTargets = pMergeAgg->node.pTargets;
+  pMergeAgg->node.pTargets = NULL;
+  SNodeList* pChildren = pMergeAgg->node.pChildren;
+  pMergeAgg->node.pChildren = NULL;
+
+  int32_t        code = TSDB_CODE_SUCCESS;
+  SAggLogicNode* pPartAgg = nodesCloneNode(pMergeAgg);
+  if (NULL == pPartAgg) {
+    code = TSDB_CODE_OUT_OF_MEMORY;
+  }
+
+  if (TSDB_CODE_SUCCESS == code && NULL != pGroupKeys) {
+    pPartAgg->pGroupKeys = pGroupKeys;
+    code = createColumnByRewriteExps(pPartAgg->pGroupKeys, &pPartAgg->node.pTargets);
+  }
+  if (TSDB_CODE_SUCCESS == code && NULL != pGroupKeys) {
+    pMergeAgg->pGroupKeys = nodesCloneList(pPartAgg->node.pTargets);
+    if (NULL == pMergeAgg->pGroupKeys) {
+      code = TSDB_CODE_OUT_OF_MEMORY;
+    }
+  }
+  if (TSDB_CODE_SUCCESS == code) {
+    pMergeAgg->node.pTargets = pTargets;
+    pPartAgg->node.pChildren = pChildren;
+
+    code = stbSplRewriteFuns(pFunc, &pPartAgg->pAggFuncs, &pMergeAgg->pAggFuncs);
+  }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = createColumnByRewriteExps(pPartAgg->pAggFuncs, &pPartAgg->node.pTargets);
+  }
+
+  nodesDestroyList(pFunc);
+  if (TSDB_CODE_SUCCESS == code) {
+    *pOutput = (SLogicNode*)pPartAgg;
+  } else {
+    nodesDestroyNode(pPartAgg);
+  }
+
+  return code;
+}
+
+static int32_t stbSplSplitAggNode(SSplitContext* pCxt, SStableSplitInfo* pInfo) {
+  SLogicNode* pPartAgg = NULL;
+  int32_t     code = stbSplCreatePartAggNode((SAggLogicNode*)pInfo->pSplitNode, &pPartAgg);
+  if (TSDB_CODE_SUCCESS == code) {
+    code = stbSplCreateExchangeNode(pCxt, pInfo->pSplitNode, pPartAgg);
+  }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = nodesListMakeStrictAppend(&pInfo->pSubplan->pChildren,
+                                     splCreateScanSubplan(pCxt, pPartAgg, SPLIT_FLAG_STABLE_SPLIT));
+  }
+  pInfo->pSubplan->subplanType = SUBPLAN_TYPE_MERGE;
+  return code;
+}
+
 static int32_t stbSplSplitScanNode(SSplitContext* pCxt, SStableSplitInfo* pInfo) {
   int32_t code = splCreateExchangeNodeForSubplan(pCxt, pInfo->pSubplan, pInfo->pSplitNode, SUBPLAN_TYPE_MERGE);
   if (TSDB_CODE_SUCCESS == code) {
@@ -386,6 +446,9 @@ static int32_t stableSplit(SSplitContext* pCxt, SLogicSubplan* pSubplan) {
 
   int32_t code = TSDB_CODE_SUCCESS;
   switch (nodeType(info.pSplitNode)) {
+    case QUERY_NODE_LOGIC_PLAN_AGG:
+      code = stbSplSplitAggNode(pCxt, &info);
+      break;
     case QUERY_NODE_LOGIC_PLAN_WINDOW:
       code = stbSplSplitWindowNode(pCxt, &info);
       break;
diff --git a/source/libs/planner/test/planGroupByTest.cpp b/source/libs/planner/test/planGroupByTest.cpp
index cf516034707e53a230d4e2e7af6fb81c3b8aaecf..201df2efde6236c5ae68aaedf04625a2c4acda19 100644
--- a/source/libs/planner/test/planGroupByTest.cpp
+++ b/source/libs/planner/test/planGroupByTest.cpp
@@ -67,3 +67,11 @@ TEST_F(PlanGroupByTest, selectFunc) {
   run("SELECT MAX(c1), c2 FROM t1 GROUP BY c3");
   run("SELECT MAX(c1), t1.* FROM t1 GROUP BY c3");
 }
+
+TEST_F(PlanGroupByTest, stable) {
+  useDb("root", "test");
+
+  run("SELECT COUNT(*) FROM st1");
+
+  run("SELECT COUNT(*) FROM st1 GROUP BY c1");
+}