diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index f170d5c52904badc0e63bc98fa2086ac25972839..c3f5b37a09ac254faf5c2ef41d9a68088c8aa0bf 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -541,10 +541,20 @@ typedef struct SFillOperatorInfo {
   bool              multigroupResult;
 } SFillOperatorInfo;
 
+typedef struct SGroupKeys {
+  char   *pData;
+  bool    isNull;
+  int16_t type;
+  int32_t bytes;
+}SGroupKeys;
+
 typedef struct SGroupbyOperatorInfo {
   SOptrBasicInfo binfo;
   SArray*        pGroupCols;
-  char*          prevData;  // previous group by value
+  SArray*        pGroupColVals; // current group column values, SArray<SGroupKeys>
+  bool           isInit;       // denote if current val is initialized or not
+  char*          keyBuf;       // group by keys for hash
+  int32_t        groupKeyLen;  // total group by column width
   SGroupResInfo  groupResInfo;
   SAggSupporter  aggSup;
 } SGroupbyOperatorInfo;
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index e927b577deb3d37cedd8e7e101e92bda5ba6ea6f..2e769936eb53e9e1dbbce633ae43a2a1fa9bf482 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -1623,67 +1623,142 @@ static void hashAllIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pRe
 //  updateResultRowInfoActiveIndex(pResultRowInfo, pQueryAttr, pRuntimeEnv->current->lastKey);
 }
 
-static void doHashGroupbyAgg(SOperatorInfo* pOperator, SGroupbyOperatorInfo *pInfo, SSDataBlock *pBlock) {
-  SExecTaskInfo *pTaskInfo = pOperator->pTaskInfo;
+static bool groupKeyCompare(SGroupbyOperatorInfo* pInfo, SSDataBlock* pBlock, int32_t rowIndex, int32_t numOfGroupCols) {
+  SColumnDataAgg* pColAgg = NULL;
+  for (int32_t i = 0; i < numOfGroupCols; ++i) {
+    SColumn*         pCol = taosArrayGet(pInfo->pGroupCols, i);
+    SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, pCol->slotId);
+    if (pBlock->pBlockAgg != NULL) {
+      pColAgg = &pBlock->pBlockAgg[pCol->slotId];  // TODO is agg data matched?
+    }
 
-  // TODO multiple group by columns
-  SColumn* pCol = taosArrayGet(pInfo->pGroupCols, 0);
-  SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, pCol->slotId);
+    bool isNull = colDataIsNull(pColInfoData, pBlock->info.rows, rowIndex, pColAgg);
 
-  int16_t bytes = pColInfoData->info.bytes;
-  int16_t type = pColInfoData->info.type;
-  if (type == TSDB_DATA_TYPE_FLOAT || type == TSDB_DATA_TYPE_DOUBLE) {
-    //qError("QInfo:0x%"PRIx64" group by not supported on double/float columns, abort", GET_TASKID(pRuntimeEnv));
-    return;
+    SGroupKeys* pkey = taosArrayGet(pInfo->pGroupColVals, i);
+    if (pkey->isNull && isNull) {
+      continue;
+    }
+
+    if (isNull || pkey->isNull) {
+      return false;
+    }
+
+    char* val = colDataGetData(pColInfoData, rowIndex);
+
+    if (IS_VAR_DATA_TYPE(pkey->type)) {
+      int32_t len = varDataLen(val);
+      if (len == varDataLen(pkey->pData) && memcmp(varDataVal(pkey->pData), varDataVal(val), len) == 0) {
+        continue;
+      } else {
+        return false;
+      }
+    } else {
+      if (memcmp(pkey->pData, val, pkey->bytes) != 0) {
+        return false;
+      }
+    }
   }
 
-  STimeWindow w = TSWINDOW_INITIALIZER;
+  return true;
+}
 
-  int32_t num = 0;
-  for (int32_t j = 0; j < pBlock->info.rows; ++j) {
-    if (colDataIsNull(pColInfoData, pBlock->info.rows, j, NULL)) { // TODO
+static void keepGroupKeys(SGroupbyOperatorInfo* pInfo, SSDataBlock* pBlock, int32_t rowIndex, int32_t numOfGroupCols) {
+  SColumnDataAgg* pColAgg = NULL;
+
+  for (int32_t i = 0; i < numOfGroupCols; ++i) {
+    SColumn*         pCol = taosArrayGet(pInfo->pGroupCols, i);
+    SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, pCol->slotId);
+
+    if (pBlock->pBlockAgg != NULL) {
+      pColAgg = &pBlock->pBlockAgg[pCol->slotId];  // TODO is agg data matched?
+    }
+
+    SGroupKeys* pkey = taosArrayGet(pInfo->pGroupColVals, i);
+    if (colDataIsNull(pColInfoData, pBlock->info.rows, rowIndex, pColAgg)) {
+      pkey->isNull = true;
+    } else {
+      char* val = colDataGetData(pColInfoData, rowIndex);
+      if (IS_VAR_DATA_TYPE(pkey->type)) {
+        memcpy(pkey->pData, val, varDataTLen(val));
+      } else {
+        memcpy(pkey->pData, val, pkey->bytes);
+      }
+    }
+  }
+}
+
+static int32_t generatedHashKey(void* pKey, int32_t* length, SArray* pGroupColVals) {
+  ASSERT(pKey != NULL);
+  size_t numOfGroupCols = taosArrayGetSize(pGroupColVals);
+
+  char* isNull = (char*) pKey;
+  char* pStart = (char*) pKey + sizeof(int8_t) * numOfGroupCols;
+  for(int32_t i = 0; i < numOfGroupCols; ++i) {
+    SGroupKeys* pkey = taosArrayGet(pGroupColVals, i);
+    if (pkey->isNull) {
+      isNull[i] = 1;
       continue;
     }
 
-    char* val = colDataGetData(pColInfoData, j);
+    isNull[i] = 0;
+    if (IS_VAR_DATA_TYPE(pkey->type)) {
+      varDataCopy(pStart, pkey->pData);
+      pStart += varDataTLen(pkey->pData);
+      ASSERT(varDataTLen(pkey->pData) <= pkey->bytes);
+    } else {
+      memcpy(pStart, pkey->pData, pkey->bytes);
+      pStart += pkey->bytes;
+    }
+  }
+
+  *length = (pStart - (char*) pKey);
+  return 0;
+}
+
+static void doHashGroupbyAgg(SOperatorInfo* pOperator, SSDataBlock *pBlock) {
+  SExecTaskInfo *pTaskInfo = pOperator->pTaskInfo;
+  SGroupbyOperatorInfo *pInfo = pOperator->info;
+
+  int32_t numOfGroupCols = taosArrayGetSize(pInfo->pGroupCols);
+//  if (type == TSDB_DATA_TYPE_FLOAT || type == TSDB_DATA_TYPE_DOUBLE) {
+    //qError("QInfo:0x%"PRIx64" group by not supported on double/float columns, abort", GET_TASKID(pRuntimeEnv));
+//    return;
+//  }
+
+  int32_t len = 0;
+  STimeWindow w = TSWINDOW_INITIALIZER;
 
+  int32_t num = 0;
+  for (int32_t j = 0; j < pBlock->info.rows; ++j) {
     // Compare with the previous row of this column, and do not set the output buffer again if they are identical.
-    if (pInfo->prevData == NULL) {
-      pInfo->prevData = malloc(bytes);
-      memcpy(pInfo->prevData, val, bytes);
+    if (!pInfo->isInit) {
+      keepGroupKeys(pInfo, pBlock, j, numOfGroupCols);
+      pInfo->isInit = true;
       num++;
       continue;
     }
 
-    if (IS_VAR_DATA_TYPE(type)) {
-      int32_t len = varDataLen(val);
-      if(len == varDataLen(pInfo->prevData) && memcmp(varDataVal(pInfo->prevData), varDataVal(val), len) == 0) {
-        num++;
-        continue;
-      }
-    } else {
-      if (memcmp(pInfo->prevData, val, bytes) == 0) {
-        num++;
-        continue;
-      }
+    bool equal = groupKeyCompare(pInfo, pBlock, j, numOfGroupCols);
+    if (equal) {
+      num++;
+      continue;
     }
 
-    int32_t ret = setGroupResultOutputBuf_rv(&(pInfo->binfo), pOperator->numOfOutput, pInfo->prevData, type, bytes, 0,
-        pInfo->aggSup.pResultBuf, pTaskInfo, &pInfo->aggSup);
+    /*int32_t ret = */generatedHashKey(pInfo->keyBuf, &len, pInfo->pGroupColVals);
+    int32_t ret = setGroupResultOutputBuf_rv(&(pInfo->binfo), pOperator->numOfOutput, pInfo->keyBuf, TSDB_DATA_TYPE_VARCHAR, len, 0,
+                                             pInfo->aggSup.pResultBuf, pTaskInfo, &pInfo->aggSup);
     if (ret != TSDB_CODE_SUCCESS) {  // null data, too many state code
       longjmp(pTaskInfo->env, TSDB_CODE_QRY_APP_ERROR);
     }
 
     doApplyFunctions(pInfo->binfo.pCtx, &w, j - num, num, NULL, pBlock->info.rows, pOperator->numOfOutput, TSDB_ORDER_ASC);
-
+    keepGroupKeys(pInfo, pBlock, j, numOfGroupCols);
     num = 1;
-    memcpy(pInfo->prevData, val, bytes);
   }
 
   if (num > 0) {
-    char* val = ((char*)pColInfoData->pData) + bytes * (pBlock->info.rows - num);
-    memcpy(pInfo->prevData, val, bytes);
-    int32_t ret = setGroupResultOutputBuf_rv(&(pInfo->binfo), pOperator->numOfOutput, pInfo->prevData, type, bytes, 0,
+    /*int32_t ret = */generatedHashKey(pInfo->keyBuf, &len, pInfo->pGroupColVals);
+    int32_t ret = setGroupResultOutputBuf_rv(&(pInfo->binfo), pOperator->numOfOutput, pInfo->keyBuf, TSDB_DATA_TYPE_VARCHAR, len, 0,
                                              pInfo->aggSup.pResultBuf, pTaskInfo, &pInfo->aggSup);
     if (ret != TSDB_CODE_SUCCESS) {
       longjmp(pTaskInfo->env, TSDB_CODE_QRY_APP_ERROR);
@@ -1691,8 +1766,6 @@ static void doHashGroupbyAgg(SOperatorInfo* pOperator, SGroupbyOperatorInfo *pIn
 
     doApplyFunctions(pInfo->binfo.pCtx, &w, pBlock->info.rows - num, num, NULL, pBlock->info.rows, pOperator->numOfOutput, TSDB_ORDER_ASC);
   }
-
-  tfree(pInfo->prevData);
 }
 
 static void doSessionWindowAggImpl(SOperatorInfo* pOperator, SSessionAggOperatorInfo *pInfo, SSDataBlock *pSDataBlock) {
@@ -1783,20 +1856,11 @@ static void setResultRowKey(SResultRow* pResultRow, char* pData, int16_t type) {
 
 static int32_t setGroupResultOutputBuf_rv(SOptrBasicInfo *binfo, int32_t numOfCols, char *pData, int16_t type, int16_t bytes, int32_t groupId,
     SDiskbasedBuf* pBuf, SExecTaskInfo* pTaskInfo, SAggSupporter* pAggSup) {
-  int32_t        *rowCellInfoOffset = binfo->rowCellInfoOffset;
   SResultRowInfo *pResultRowInfo    = &binfo->resultRowInfo;
   SqlFunctionCtx *pCtx              = binfo->pCtx;
 
-  // not assign result buffer yet, add new result buffer, TODO remove it
-  char* d = pData;
-  int16_t len = bytes;
-  if (IS_VAR_DATA_TYPE(type)) {
-    d = varDataVal(pData);
-    len = varDataLen(pData);
-  }
-
-  int64_t tid = 0;
-  SResultRow *pResultRow = doSetResultOutBufByKey_rv(pBuf, pResultRowInfo, groupId, (char *)pData, TSDB_KEYSIZE, true, groupId, pTaskInfo, true, pAggSup);
+  SResultRow *pResultRow = doSetResultOutBufByKey_rv(pBuf, pResultRowInfo, groupId, (char *)pData, bytes, true, groupId,
+      pTaskInfo, true, pAggSup);
   assert (pResultRow != NULL);
 
   setResultRowKey(pResultRow, pData, type);
@@ -6969,7 +7033,7 @@ static SSDataBlock* hashGroupbyAggregate(SOperatorInfo *pOperator, bool* newgrou
     // the pDataBlock are always the same one, no need to call this again
     setInputDataBlock(pOperator, pInfo->binfo.pCtx, pBlock, order);
 //    setTagValue(pOperator, pRuntimeEnv->current->pTable, pInfo->binfo.pCtx, pOperator->numOfOutput);
-    doHashGroupbyAgg(pOperator, pInfo, pBlock);
+    doHashGroupbyAgg(pOperator, pBlock);
   }
 
   pOperator->status = OP_RES_TO_RETURN;
@@ -7281,7 +7345,9 @@ void destroySFillOperatorInfo(void* param, int32_t numOfOutput) {
 void destroyGroupbyOperatorInfo(void* param, int32_t numOfOutput) {
   SGroupbyOperatorInfo* pInfo = (SGroupbyOperatorInfo*) param;
   doDestroyBasicInfo(&pInfo->binfo, numOfOutput);
-  tfree(pInfo->prevData);
+  tfree(pInfo->keyBuf);
+  taosArrayDestroy(pInfo->pGroupCols);
+  taosArrayDestroy(pInfo->pGroupColVals);
 }
 
 static void destroyProjectOperatorInfo(void* param, int32_t numOfOutput) {
@@ -7664,6 +7730,39 @@ SOperatorInfo* createAllMultiTableTimeIntervalOperatorInfo(STaskRuntimeEnv* pRun
   return pOperator;
 }
 
+static int32_t initGroupOptrInfo(SGroupbyOperatorInfo *pInfo, SArray* pGroupColList) {
+  pInfo->pGroupColVals = taosArrayInit(4, sizeof(SGroupKeys));
+  if (pInfo->pGroupColVals == NULL) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+
+  int32_t numOfGroupCols = taosArrayGetSize(pGroupColList);
+  for(int32_t i = 0; i < numOfGroupCols; ++i) {
+    SColumn* pCol = taosArrayGet(pGroupColList, i);
+    pInfo->groupKeyLen += pCol->bytes;
+
+    struct SGroupKeys key = {0};
+    key.bytes  = pCol->bytes;
+    key.type   = pCol->type;
+    key.isNull = false;
+    key.pData  = calloc(1, pCol->bytes);
+    if (key.pData == NULL) {
+      return TSDB_CODE_OUT_OF_MEMORY;
+    }
+
+    taosArrayPush(pInfo->pGroupColVals, &key);
+  }
+
+  int32_t nullFlagSize = sizeof(int8_t) * numOfGroupCols;
+  pInfo->keyBuf = calloc(1, pInfo->groupKeyLen + nullFlagSize);
+
+  if (pInfo->keyBuf == NULL) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
 SOperatorInfo* createGroupOperatorInfo(SOperatorInfo* downstream, SExprInfo* pExprInfo, int32_t numOfCols, SSDataBlock* pResultBlock,
                                        SArray* pGroupColList, SExecTaskInfo* pTaskInfo, const STableGroupInfo* pTableGroupInfo) {
   SGroupbyOperatorInfo* pInfo = calloc(1, sizeof(SGroupbyOperatorInfo));
@@ -7674,9 +7773,13 @@ SOperatorInfo* createGroupOperatorInfo(SOperatorInfo* downstream, SExprInfo* pEx
 
   pInfo->pGroupCols = pGroupColList;
   initAggInfo(&pInfo->binfo, &pInfo->aggSup, pExprInfo, numOfCols, 4096, pResultBlock, pTaskInfo->id.str);
-
   initResultRowInfo(&pInfo->binfo.resultRowInfo, 8);
 
+  int32_t code = initGroupOptrInfo(pInfo, pGroupColList);
+  if (code != TSDB_CODE_SUCCESS) {
+    goto _error;
+  }
+
   pOperator->name         = "GroupbyAggOperator";
   pOperator->blockingOptr = true;
   pOperator->status       = OP_NOT_OPENED;
@@ -7688,7 +7791,7 @@ SOperatorInfo* createGroupOperatorInfo(SOperatorInfo* downstream, SExprInfo* pEx
   pOperator->getNextFn    = hashGroupbyAggregate;
   pOperator->closeFn      = destroyGroupbyOperatorInfo;
 
-  int32_t code = appendDownstream(pOperator, &downstream, 1);
+  code = appendDownstream(pOperator, &downstream, 1);
   return pOperator;
 
   _error:
@@ -8345,7 +8448,9 @@ SOperatorInfo* doCreateOperatorTreeNode(SPhysiNode* pPhyNode, SExecTaskInfo* pTa
       SExprInfo* pExprInfo = createExprInfo(pIntervalPhyNode->pFuncs, NULL, &num);
       SSDataBlock* pResBlock = createOutputBuf_rv1(pPhyNode->pOutputDataBlockDesc);
 
-      SInterval interval = {.interval = pIntervalPhyNode->interval, .sliding = pIntervalPhyNode->sliding, .intervalUnit = 'a', .slidingUnit = 'a'};
+      SInterval interval = {.interval = pIntervalPhyNode->interval, .sliding = pIntervalPhyNode->sliding,
+                            .intervalUnit = pIntervalPhyNode->intervalUnit,
+                            .slidingUnit = pIntervalPhyNode->slidingUnit, .offset = pIntervalPhyNode->offset};
       return createIntervalOperatorInfo(op, pExprInfo, num, pResBlock, &interval, pTableGroupInfo, pTaskInfo);
     }
   } /*else if (pPhyNode->info.type == OP_MultiTableAggregate) {
diff --git a/tests/script/tsim/query/interval-offset.sim b/tests/script/tsim/query/interval-offset.sim
index ffc9995ef519110f1b98d513da4da245c3122f0e..2ff1c7a1558462453b846e463727748d2cf1265d 100644
--- a/tests/script/tsim/query/interval-offset.sim
+++ b/tests/script/tsim/query/interval-offset.sim
@@ -9,7 +9,7 @@ sql drop database d0 -x step1
 step1:
 sql create database d0
 sql show databases
-if $rows != 2 then 
+if $rows != 2 then
   return -1
 endi