diff --git a/include/libs/nodes/plannodes.h b/include/libs/nodes/plannodes.h
index f0383e8168..fa6ece6d2f 100644
--- a/include/libs/nodes/plannodes.h
+++ b/include/libs/nodes/plannodes.h
@@ -155,6 +155,7 @@ typedef struct SProjectLogicNode {
   SNodeList* pProjections;
   char       stmtName[TSDB_TABLE_NAME_LEN];
   bool       ignoreGroupId;
+  bool       inputIgnoreGroup;
 } SProjectLogicNode;
 
 typedef struct SIndefRowsFuncLogicNode {
@@ -447,6 +448,7 @@ typedef struct SProjectPhysiNode {
   SNodeList* pProjections;
   bool       mergeDataBlock;
   bool       ignoreGroupId;
+  bool       inputIgnoreGroupId;
 } SProjectPhysiNode;
 
 typedef struct SIndefRowsFuncPhysiNode {
diff --git a/source/libs/executor/src/projectoperator.c b/source/libs/executor/src/projectoperator.c
index d965f16862..b797b2d4d9 100644
--- a/source/libs/executor/src/projectoperator.c
+++ b/source/libs/executor/src/projectoperator.c
@@ -27,6 +27,7 @@ typedef struct SProjectOperatorInfo {
   SLimitInfo     limitInfo;
   bool           mergeDataBlocks;
   SSDataBlock*   pFinalRes;
+  bool           inputIgnoreGroupId;
 } SProjectOperatorInfo;
 
 typedef struct SIndefOperatorInfo {
@@ -299,6 +300,10 @@ SSDataBlock* doProjectOperation(SOperatorInfo* pOperator) {
           pBlock->info.type == STREAM_CHECKPOINT) {
         return pBlock;
       }
+      
+      if (pProjectInfo->inputIgnoreGroupId) {
+        pBlock->info.id.groupId = 0;
+      }
 
       int32_t status = discardGroupDataBlock(pBlock, pLimitInfo);
       if (status == PROJECT_RETRIEVE_CONTINUE) {
diff --git a/source/libs/planner/src/planOptimizer.c b/source/libs/planner/src/planOptimizer.c
index aa3181e166..a6ea1a836a 100644
--- a/source/libs/planner/src/planOptimizer.c
+++ b/source/libs/planner/src/planOptimizer.c
@@ -2980,6 +2980,10 @@ static bool mergeProjectsMayBeOptimized(SLogicNode* pNode) {
       NULL != pChild->pConditions || NULL != pChild->pLimit || NULL != pChild->pSlimit) {
     return false;
   }
+  if (false == ((SProjectLogicNode*)pChild)->ignoreGroupId) {
+    qError("internal error, child project output does not ignore group id");
+    return false;
+  }
   return true;
 }
 
@@ -3036,6 +3040,7 @@ static int32_t mergeProjectsOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan*
     NODES_CLEAR_LIST(pChild->pChildren);
   }
   nodesDestroyNode((SNode*)pChild);
+  ((SProjectLogicNode*)pSelfNode)->inputIgnoreGroup = true;
   pCxt->optimized = true;
   return code;
 }