diff --git a/include/common/tcommon.h b/include/common/tcommon.h
index b5bd088006..579b1bc46d 100644
--- a/include/common/tcommon.h
+++ b/include/common/tcommon.h
@@ -54,10 +54,11 @@ typedef struct SColumnDataAgg {
 } SColumnDataAgg;
 
 typedef struct SDataBlockInfo {
-  STimeWindow window;
-  int32_t     rows;
-  int32_t     rowSize;
-  int32_t     numOfCols;
+  STimeWindow    window;
+  int32_t        rows;
+  int32_t        rowSize;
+  int16_t        numOfCols;
+  int16_t        hasVarCol;
   union {int64_t uid; int64_t blockId;};
 } SDataBlockInfo;
 
@@ -96,13 +97,15 @@ typedef struct SColumnInfoData {
 
 static FORCE_INLINE int32_t tEncodeDataBlock(void** buf, const SSDataBlock* pBlock) {
   int64_t tbUid = pBlock->info.uid;
-  int32_t numOfCols = pBlock->info.numOfCols;
+  int16_t numOfCols = pBlock->info.numOfCols;
+  int16_t hasVarCol = pBlock->info.hasVarCol;
   int32_t rows = pBlock->info.rows;
   int32_t sz = taosArrayGetSize(pBlock->pDataBlock);
 
   int32_t tlen = 0;
   tlen += taosEncodeFixedI64(buf, tbUid);
-  tlen += taosEncodeFixedI32(buf, numOfCols);
+  tlen += taosEncodeFixedI16(buf, numOfCols);
+  tlen += taosEncodeFixedI16(buf, hasVarCol);
   tlen += taosEncodeFixedI32(buf, rows);
   tlen += taosEncodeFixedI32(buf, sz);
   for (int32_t i = 0; i < sz; i++) {
@@ -120,7 +123,8 @@ static FORCE_INLINE void* tDecodeDataBlock(const void* buf, SSDataBlock* pBlock)
   int32_t sz;
 
   buf = taosDecodeFixedI64(buf, &pBlock->info.uid);
-  buf = taosDecodeFixedI32(buf, &pBlock->info.numOfCols);
+  buf = taosDecodeFixedI16(buf, &pBlock->info.numOfCols);
+  buf = taosDecodeFixedI16(buf, &pBlock->info.hasVarCol);
   buf = taosDecodeFixedI32(buf, &pBlock->info.rows);
   buf = taosDecodeFixedI32(buf, &sz);
   pBlock->pDataBlock = taosArrayInit(sz, sizeof(SColumnInfoData));
diff --git a/include/common/tdatablock.h b/include/common/tdatablock.h
index c2249f408a..7e60013aa1 100644
--- a/include/common/tdatablock.h
+++ b/include/common/tdatablock.h
@@ -117,7 +117,7 @@ int32_t blockDataSort_rv(SSDataBlock* pDataBlock, SArray* pOrderInfo, bool nullF
 
 int32_t      blockDataEnsureColumnCapacity(SColumnInfoData* pColumn, uint32_t numOfRows);
 int32_t      blockDataEnsureCapacity(SSDataBlock* pDataBlock, uint32_t numOfRows);
-void         blockDataClearup(SSDataBlock* pDataBlock, bool hasVarCol);
+void         blockDataClearup(SSDataBlock* pDataBlock);
 SSDataBlock* createOneDataBlock(const SSDataBlock* pDataBlock);
 size_t       blockDataGetCapacityInRow(const SSDataBlock* pBlock, size_t pageSize);
 void*        blockDataDestroy(SSDataBlock* pBlock);
diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 4070224ab8..7e4f1d9025 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -1059,10 +1059,10 @@ int32_t blockDataSort_rv(SSDataBlock* pDataBlock, SArray* pOrderInfo, bool nullF
   //  destroyTupleIndex(index);
 }
 
-void blockDataClearup(SSDataBlock* pDataBlock, bool hasVarCol) {
+void blockDataClearup(SSDataBlock* pDataBlock) {
   pDataBlock->info.rows = 0;
 
-  if (hasVarCol) {
+  if (pDataBlock->info.hasVarCol) {
     for (int32_t i = 0; i < pDataBlock->info.numOfCols; ++i) {
       SColumnInfoData* p = taosArrayGet(pDataBlock->pDataBlock, i);
 
@@ -1148,7 +1148,9 @@ SSDataBlock* createOneDataBlock(const SSDataBlock* pDataBlock) {
 
   SSDataBlock* pBlock = calloc(1, sizeof(SSDataBlock));
   pBlock->pDataBlock = taosArrayInit(numOfCols, sizeof(SColumnInfoData));
+
   pBlock->info.numOfCols = numOfCols;
+  pBlock->info.hasVarCol = pDataBlock->info.hasVarCol;
 
   for(int32_t i = 0; i < numOfCols; ++i) {
     SColumnInfoData  colInfo = {0};
diff --git a/source/libs/executor/inc/executil.h b/source/libs/executor/inc/executil.h
index b34067ba4e..bcbfeb7015 100644
--- a/source/libs/executor/inc/executil.h
+++ b/source/libs/executor/inc/executil.h
@@ -50,7 +50,7 @@ typedef struct SGroupResInfo {
   int32_t totalGroup;
   int32_t currentGroup;
   int32_t index;
-  SArray* pRows;      // SArray<SResultRow*>
+  SArray* pRows;      // SArray<SResultRowPosition*>
   bool    ordered;
   int32_t position;
 } SGroupResInfo;
@@ -67,10 +67,15 @@ typedef struct SResultRow {
   char         *key;               // start key of current result row
 } SResultRow;
 
+typedef struct SResultRowPosition {
+  int32_t pageId;
+  int32_t offset;
+} SResultRowPosition;
+
 typedef struct SResultRowInfo {
-  SList* pRows;
-  SResultRow** pResult;    // result list
-//  int16_t      type:8;     // data type for hash key
+  SList       *pRows;
+  SResultRowPosition *pPosition;
+  SResultRow **pResult;    // result list
   int32_t      size;       // number of result set
   int32_t      capacity;   // max capacity
   int32_t      curPos;     // current active result row index of pResult list
@@ -131,7 +136,7 @@ static FORCE_INLINE char* getPosInResultPage_rv(SFilePage* page, int32_t rowOffs
   assert(rowOffset >= 0);
 
   int32_t numOfRows = 1;//(int32_t)getRowNumForMultioutput(pQueryAttr, pQueryAttr->topBotQuery, pQueryAttr->stableQuery);
-  return ((char *)page->data) + rowOffset + offset * numOfRows;
+  return (char*) page + rowOffset + offset * numOfRows;
 }
 
 //bool isNullOperator(SColumnFilterElem *pFilter, const char* minval, const char* maxval, int16_t type);
@@ -139,12 +144,7 @@ static FORCE_INLINE char* getPosInResultPage_rv(SFilePage* page, int32_t rowOffs
 
 __filter_func_t getFilterOperator(int32_t lowerOptr, int32_t upperOptr);
 
-SResultRowPool* initResultRowPool(size_t size);
 SResultRow* getNewResultRow(SResultRowPool* p);
-int64_t getResultRowPoolMemSize(SResultRowPool* p);
-void* destroyResultRowPool(SResultRowPool* p);
-int32_t getNumOfAllocatedResultRows(SResultRowPool* p);
-int32_t getNumOfUsedResultRows(SResultRowPool* p);
 
 typedef struct {
   SArray* pResult;     // SArray<SResPair>
diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index 351903dfdc..97a51a46ce 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -463,7 +463,7 @@ typedef struct SAggSupporter {
   SHashObj*          pResultRowListSet;    // used to check if current ResultRowInfo has ResultRow object or not
   SArray*            pResultRowArrayList;  // The array list that contains the Result rows
   char*              keyBuf;               // window key buffer
-  SResultRowPool    *pool;  // The window result objects pool, all the resultRow Objects are allocated and managed by this object.
+//  SResultRowPool    *pool;  // The window result objects pool, all the resultRow Objects are allocated and managed by this object.
   int32_t            resultRowSize;        // the result buffer size for each result row, with the meta data size for each row
 } SAggSupporter;
 
@@ -678,8 +678,8 @@ SSDataBlock* createOutputBuf(SExprInfo* pExpr, int32_t numOfOutput, int32_t numO
 void* doDestroyFilterInfo(SSingleColumnFilterInfo* pFilterInfo, int32_t numOfFilterCols);
 
 void setInputDataBlock(SOperatorInfo* pOperator, SqlFunctionCtx* pCtx, SSDataBlock* pBlock, int32_t order);
-void finalizeQueryResult(SOperatorInfo* pOperator, SqlFunctionCtx* pCtx, SResultRowInfo* pResultRowInfo,
-                         int32_t* rowCellInfoOffset);
+void finalizeQueryResult(SqlFunctionCtx* pCtx, int32_t numOfOutput);
+
 void clearOutputBuf(SOptrBasicInfo* pBInfo, int32_t* bufCapacity);
 void copyTsColoum(SSDataBlock* pRes, SqlFunctionCtx* pCtx, int32_t numOfOutput);
 
diff --git a/source/libs/executor/src/executil.c b/source/libs/executor/src/executil.c
index 9d77e23d38..a04a10ef95 100644
--- a/source/libs/executor/src/executil.c
+++ b/source/libs/executor/src/executil.c
@@ -59,7 +59,8 @@ int32_t initResultRowInfo(SResultRowInfo *pResultRowInfo, int32_t size) {
   pResultRowInfo->capacity = size;
 
   pResultRowInfo->pResult = calloc(pResultRowInfo->capacity, POINTER_BYTES);
-  if (pResultRowInfo->pResult == NULL) {
+  pResultRowInfo->pPosition = calloc(pResultRowInfo->capacity, sizeof(SResultRowPosition));
+  if (pResultRowInfo->pResult == NULL || pResultRowInfo->pPosition == NULL) {
     return TSDB_CODE_QRY_OUT_OF_MEMORY;
   }
 
@@ -182,22 +183,6 @@ size_t getResultRowSize(SqlFunctionCtx* pCtx, int32_t numOfOutput) {
   return rowSize;
 }
 
-SResultRowPool* initResultRowPool(size_t size) {
-  SResultRowPool* p = calloc(1, sizeof(SResultRowPool));
-  if (p == NULL) {
-    return NULL;
-  }
-
-  p->numOfElemPerBlock = 128;
-
-  p->elemSize = (int32_t) size;
-  p->blockSize = p->numOfElemPerBlock * p->elemSize;
-  p->position.pos = 0;
-
-  p->pData = taosArrayInit(8, POINTER_BYTES);
-  return p;
-}
-
 SResultRow* getNewResultRow(SResultRowPool* p) {
   if (p == NULL) {
     return NULL;
@@ -221,132 +206,6 @@ SResultRow* getNewResultRow(SResultRowPool* p) {
   return ptr;
 }
 
-int64_t getResultRowPoolMemSize(SResultRowPool* p) {
-  if (p == NULL) {
-    return 0;
-  }
-
-  return taosArrayGetSize(p->pData) * p->blockSize;
-}
-
-int32_t getNumOfAllocatedResultRows(SResultRowPool* p) {
-  return (int32_t) taosArrayGetSize(p->pData) * p->numOfElemPerBlock;
-}
-
-int32_t getNumOfUsedResultRows(SResultRowPool* p) {
-  return getNumOfAllocatedResultRows(p) - p->numOfElemPerBlock + p->position.pos;
-}
-
-void* destroyResultRowPool(SResultRowPool* p) {
-  if (p == NULL) {
-    return NULL;
-  }
-
-  size_t size = taosArrayGetSize(p->pData);
-  for(int32_t i = 0; i < size; ++i) {
-    void** ptr = taosArrayGet(p->pData, i);
-    tfree(*ptr);
-  }
-
-  taosArrayDestroy(p->pData);
-
-  tfree(p);
-  return NULL;
-}
-
-void interResToBinary(SBufferWriter* bw, SArray* pRes, int32_t tagLen) {
-  uint32_t numOfGroup = (uint32_t) taosArrayGetSize(pRes);
-  tbufWriteUint32(bw, numOfGroup);
-  tbufWriteUint16(bw, tagLen);
-
-  for(int32_t i = 0; i < numOfGroup; ++i) {
-    SInterResult* pOne = taosArrayGet(pRes, i);
-    if (tagLen > 0) {
-      tbufWriteBinary(bw, pOne->tags, tagLen);
-    }
-
-    uint32_t numOfCols = (uint32_t) taosArrayGetSize(pOne->pResult);
-    tbufWriteUint32(bw, numOfCols);
-    for(int32_t j = 0; j < numOfCols; ++j) {
-      SStddevInterResult* p = taosArrayGet(pOne->pResult, j);
-      uint32_t numOfRows = (uint32_t) taosArrayGetSize(p->pResult);
-
-      tbufWriteUint16(bw, p->colId);
-      tbufWriteUint32(bw, numOfRows);
-
-      for(int32_t k = 0; k < numOfRows; ++k) {
-//        SResPair v = *(SResPair*) taosArrayGet(p->pResult, k);
-//        tbufWriteDouble(bw, v.avg);
-//        tbufWriteInt64(bw, v.key);
-      }
-    }
-  }
-}
-
-SArray* interResFromBinary(const char* data, int32_t len) {
-  SBufferReader br = tbufInitReader(data, len, false);
-  uint32_t numOfGroup = tbufReadUint32(&br);
-  uint16_t tagLen = tbufReadUint16(&br);
-
-  char* tag = NULL;
-  if (tagLen > 0) {
-    tag = calloc(1, tagLen);
-  }
-
-  SArray* pResult = taosArrayInit(4, sizeof(SInterResult));
-
-  for(int32_t i = 0; i < numOfGroup; ++i) {
-    if (tagLen > 0) {
-      memset(tag, 0, tagLen);
-      tbufReadToBinary(&br, tag, tagLen);
-    }
-
-    uint32_t numOfCols = tbufReadUint32(&br);
-
-    SArray* p = taosArrayInit(numOfCols, sizeof(SStddevInterResult));
-    for(int32_t j = 0; j < numOfCols; ++j) {
-//      int16_t colId = tbufReadUint16(&br);
-      int32_t numOfRows = tbufReadUint32(&br);
-
-//      SStddevInterResult interRes = {.colId = colId, .pResult = taosArrayInit(4, sizeof(struct SResPair)),};
-      for(int32_t k = 0; k < numOfRows; ++k) {
-//        SResPair px = {0};
-//        px.avg = tbufReadDouble(&br);
-//        px.key = tbufReadInt64(&br);
-//
-//        taosArrayPush(interRes.pResult, &px);
-      }
-
-//      taosArrayPush(p, &interRes);
-    }
-
-    char* p1 = NULL;
-    if (tagLen > 0) {
-      p1 = malloc(tagLen);
-      memcpy(p1, tag, tagLen);
-    }
-
-    SInterResult d = {.pResult = p, .tags = p1,};
-    taosArrayPush(pResult, &d);
-  }
-
-  tfree(tag);
-  return pResult;
-}
-
-void freeInterResult(void* param) {
-  SInterResult* pResult = (SInterResult*) param;
-  tfree(pResult->tags);
-
-  int32_t numOfCols = (int32_t) taosArrayGetSize(pResult->pResult);
-  for(int32_t i = 0; i < numOfCols; ++i) {
-    SStddevInterResult *p = taosArrayGet(pResult->pResult, i);
-    taosArrayDestroy(p->pResult);
-  }
-
-  taosArrayDestroy(pResult->pResult);
-}
-
 void cleanupGroupResInfo(SGroupResInfo* pGroupResInfo) {
   assert(pGroupResInfo != NULL);
 
@@ -360,7 +219,7 @@ void initGroupResInfo(SGroupResInfo* pGroupResInfo, SResultRowInfo* pResultInfo)
     taosArrayDestroy(pGroupResInfo->pRows);
   }
 
-  pGroupResInfo->pRows = taosArrayFromList(pResultInfo->pResult, pResultInfo->size, POINTER_BYTES);
+  pGroupResInfo->pRows = taosArrayFromList(pResultInfo->pPosition, pResultInfo->size, sizeof(SResultRowPosition));
   pGroupResInfo->index = 0;
   assert(pGroupResInfo->index <= getNumOfTotalRes(pGroupResInfo));
 }
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 9d3a80d7b4..ef2dbea4fd 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -26,15 +26,16 @@
 #include "tsort.h"
 #include "ttime.h"
 
+#include "../../function/inc/taggfunction.h"
 #include "executorimpl.h"
 #include "function.h"
+#include "query.h"
 #include "tcompare.h"
 #include "tcompression.h"
 #include "thash.h"
-#include "ttypes.h"
-#include "query.h"
-#include "vnode.h"
 #include "tsdb.h"
+#include "ttypes.h"
+#include "vnode.h"
 
 #define IS_MAIN_SCAN(runtime)          ((runtime)->scanFlag == MAIN_SCAN)
 #define IS_REVERSE_SCAN(runtime)       ((runtime)->scanFlag == REVERSE_SCAN)
@@ -235,7 +236,7 @@ static int32_t operatorDummyOpenFn(SOperatorInfo *pOperator) {
 
 static void operatorDummyCloseFn(void* param, int32_t numOfCols) {}
 
-static int32_t doCopyToSDataBlock(SDiskbasedBuf *pBuf, SGroupResInfo* pGroupResInfo, int32_t orderType, SSDataBlock* pBlock, int32_t rowCapacity);
+static int32_t doCopyToSDataBlock(SDiskbasedBuf *pBuf, SGroupResInfo* pGroupResInfo, int32_t orderType, SSDataBlock* pBlock, int32_t rowCapacity, int32_t* rowCellOffset);
 
 static int32_t getGroupbyColumnIndex(SGroupbyExpr *pGroupbyExpr, SSDataBlock* pDataBlock);
 static int32_t setGroupResultOutputBuf(STaskRuntimeEnv *pRuntimeEnv, SOptrBasicInfo *binf, int32_t numOfCols, char *pData, int16_t type, int16_t bytes, int32_t groupIndex);
@@ -444,10 +445,12 @@ static void prepareResultListBuffer(SResultRowInfo* pResultRowInfo, jmp_buf env)
     longjmp(env, TSDB_CODE_QRY_OUT_OF_MEMORY);
   }
 
+  pResultRowInfo->pPosition = realloc(pResultRowInfo->pPosition, newCapacity * sizeof(SResultRowPosition));
   pResultRowInfo->pResult = (SResultRow **)t;
 
   int32_t inc = (int32_t)newCapacity - pResultRowInfo->capacity;
   memset(&pResultRowInfo->pResult[pResultRowInfo->capacity], 0, POINTER_BYTES * inc);
+  memset(&pResultRowInfo->pPosition[pResultRowInfo->capacity], 0, sizeof(SResultRowPosition));
 
   pResultRowInfo->capacity = (int32_t)newCapacity;
 }
@@ -564,7 +567,47 @@ static SResultRow* doSetResultOutBufByKey(STaskRuntimeEnv* pRuntimeEnv, SResultR
   return pResultRowInfo->pResult[pResultRowInfo->curPos];
 }
 
-static SResultRow* doSetResultOutBufByKey_rv(SResultRowInfo* pResultRowInfo, int64_t tid, char* pData, int16_t bytes,
+SResultRow* getNewResultRow_rv(SDiskbasedBuf* pResultBuf, int64_t tableGroupId, int32_t interBufSize) {
+  SFilePage *pData = NULL;
+
+  // in the first scan, new space needed for results
+  int32_t pageId = -1;
+  SIDList list = getDataBufPagesIdList(pResultBuf, tableGroupId);
+
+  if (taosArrayGetSize(list) == 0) {
+    pData = getNewBufPage(pResultBuf, tableGroupId, &pageId);
+    pData->num = sizeof(SFilePage);
+  } else {
+    SPageInfo* pi = getLastPageInfo(list);
+    pData = getBufPage(pResultBuf, getPageId(pi));
+    pageId = getPageId(pi);
+
+    if (pData->num + interBufSize + sizeof(SResultRow) > getBufPageSize(pResultBuf)) {
+      // release current page first, and prepare the next one
+      releaseBufPageInfo(pResultBuf, pi);
+
+      pData = getNewBufPage(pResultBuf, tableGroupId, &pageId);
+      if (pData != NULL) {
+        pData->num = sizeof(SFilePage);
+      }
+    }
+  }
+
+  if (pData == NULL) {
+    return NULL;
+  }
+
+  // set the number of rows in current disk page
+  SResultRow* pResultRow = (SResultRow*)((char*)pData + pData->num);
+  pResultRow->pageId = pageId;
+  pResultRow->offset = (int32_t)pData->num;
+
+  pData->num += interBufSize + sizeof(SResultRow);
+
+  return pResultRow;
+}
+
+static SResultRow* doSetResultOutBufByKey_rv(SDiskbasedBuf* pResultBuf, SResultRowInfo* pResultRowInfo, int64_t tid, char* pData, int16_t bytes,
     bool masterscan, uint64_t tableGroupId, SExecTaskInfo* pTaskInfo, bool isIntervalQuery, SAggSupporter* pSup) {
   bool existed = false;
   SET_RES_WINDOW_KEY(pSup->keyBuf, pData, bytes, tableGroupId);
@@ -608,7 +651,7 @@ static SResultRow* doSetResultOutBufByKey_rv(SResultRowInfo* pResultRowInfo, int
 
     SResultRow *pResult = NULL;
     if (p1 == NULL) {
-      pResult = getNewResultRow(pSup->pool);
+      pResult = getNewResultRow_rv(pResultBuf, tableGroupId, pSup->resultRowSize);
       int32_t ret = initResultRow(pResult);
       if (ret != TSDB_CODE_SUCCESS) {
         longjmp(pTaskInfo->env, TSDB_CODE_QRY_OUT_OF_MEMORY);
@@ -623,6 +666,7 @@ static SResultRow* doSetResultOutBufByKey_rv(SResultRowInfo* pResultRowInfo, int
     }
 
     pResultRowInfo->curPos = pResultRowInfo->size;
+    pResultRowInfo->pPosition[pResultRowInfo->size] = (SResultRowPosition) {.pageId = pResult->pageId, .offset = pResult->offset};
     pResultRowInfo->pResult[pResultRowInfo->size++] = pResult;
 
     int64_t index = pResultRowInfo->curPos;
@@ -742,6 +786,7 @@ static int32_t addNewWindowResultBuf(SResultRow *pWindowRes, SDiskbasedBuf *pRes
 
   if (taosArrayGetSize(list) == 0) {
     pData = getNewBufPage(pResultBuf, tid, &pageId);
+    pData->num = sizeof(SFilePage);
   } else {
     SPageInfo* pi = getLastPageInfo(list);
     pData = getBufPage(pResultBuf, getPageId(pi));
@@ -750,9 +795,10 @@ static int32_t addNewWindowResultBuf(SResultRow *pWindowRes, SDiskbasedBuf *pRes
     if (pData->num + size > getBufPageSize(pResultBuf)) {
       // release current page first, and prepare the next one
       releaseBufPageInfo(pResultBuf, pi);
+
       pData = getNewBufPage(pResultBuf, tid, &pageId);
       if (pData != NULL) {
-        assert(pData->num == 0);  // number of elements must be 0 for new allocated buffer
+        pData->num = sizeof(SFilePage);
       }
     }
   }
@@ -814,7 +860,7 @@ static int32_t setResultOutputBufByKey_rv(SResultRowInfo *pResultRowInfo, int64_
                                        bool masterscan, SResultRow **pResult, int64_t tableGroupId, SqlFunctionCtx* pCtx,
                                        int32_t numOfOutput, int32_t* rowCellInfoOffset, SDiskbasedBuf *pBuf, SAggSupporter *pAggSup, SExecTaskInfo* pTaskInfo) {
   assert(win->skey <= win->ekey);
-  SResultRow *pResultRow = doSetResultOutBufByKey_rv(pResultRowInfo, id, (char *)&win->skey, TSDB_KEYSIZE, masterscan, tableGroupId,
+  SResultRow *pResultRow = doSetResultOutBufByKey_rv(pBuf, pResultRowInfo, id, (char *)&win->skey, TSDB_KEYSIZE, masterscan, tableGroupId,
        pTaskInfo, true, pAggSup);
 
   if (pResultRow == NULL) {
@@ -822,19 +868,10 @@ static int32_t setResultOutputBufByKey_rv(SResultRowInfo *pResultRowInfo, int64_
     return TSDB_CODE_SUCCESS;
   }
 
-  // not assign result buffer yet, add new result buffer
-  if (pResultRow->pageId == -1) { // todo intermediate result size
-    int32_t ret = addNewWindowResultBuf(pResultRow, pBuf, (int32_t) tableGroupId, 0);
-    if (ret != TSDB_CODE_SUCCESS) {
-      return -1;
-    }
-  }
-
   // set time window for current result
   pResultRow->win = (*win);
   *pResult = pResultRow;
   setResultRowOutputBufInitCtx_rv(pBuf, pResultRow, pCtx, numOfOutput, rowCellInfoOffset);
-
   return TSDB_CODE_SUCCESS;
 }
 
@@ -988,17 +1025,18 @@ static int32_t getNumOfRowsInTimeWindow(SDataBlockInfo *pDataBlockInfo, TSKEY *p
 }
 
 static void doApplyFunctions(SqlFunctionCtx* pCtx, STimeWindow* pWin, int32_t offset, int32_t forwardStep, TSKEY* tsCol,
-    int32_t numOfTotal, int32_t numOfOutput, int32_t order) {
+                             int32_t numOfTotal, int32_t numOfOutput, int32_t order) {
   for (int32_t k = 0; k < numOfOutput; ++k) {
-    pCtx[k].size    = forwardStep;
     pCtx[k].startTs = pWin->skey;
 
     // keep it temporarialy
-    int32_t startOffset = pCtx[k].startRow;
-    bool    hasAgg      = pCtx[k].isAggSet;
+    int32_t startOffset = pCtx[k].input.startRowIndex;
+    bool    hasAgg      = pCtx[k].input.colDataAggIsSet;
+    int32_t numOfRows   = pCtx[k].input.numOfRows;
 
     int32_t pos = (order == TSDB_ORDER_ASC) ? offset : offset - (forwardStep - 1);
-    pCtx[k].startRow = pos;
+    pCtx[k].input.startRowIndex = pos;
+    pCtx[k].input.numOfRows = forwardStep;
 
     if (tsCol != NULL) {
       pCtx[k].ptsList = &tsCol[pos];
@@ -1011,12 +1049,13 @@ static void doApplyFunctions(SqlFunctionCtx* pCtx, STimeWindow* pWin, int32_t of
     }
 
     if (functionNeedToExecute(&pCtx[k])) {
-//      pCtx[k].fpSet.process(&pCtx[k]);
+      pCtx[k].fpSet.process(&pCtx[k]);
     }
 
     // restore it
-    pCtx[k].isAggSet = hasAgg;
-    pCtx[k].startRow = startOffset;
+    pCtx[k].input.colDataAggIsSet = hasAgg;
+    pCtx[k].input.startRowIndex = startOffset;
+    pCtx[k].input.numOfRows = numOfRows;
   }
 }
 
@@ -1440,8 +1479,7 @@ static void hashIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pResul
   if (pSDataBlock->pDataBlock != NULL) {
     SColumnInfoData* pColDataInfo = taosArrayGet(pSDataBlock->pDataBlock, 0);
     tsCols = (int64_t*) pColDataInfo->pData;
-    assert(tsCols[0] == pSDataBlock->info.window.skey &&
-           tsCols[pSDataBlock->info.rows - 1] == pSDataBlock->info.window.ekey);
+    assert(tsCols[0] == pSDataBlock->info.window.skey && tsCols[pSDataBlock->info.rows - 1] == pSDataBlock->info.window.ekey);
   }
 
   int32_t startPos = ascQuery? 0 : (pSDataBlock->info.rows - 1);
@@ -1533,7 +1571,6 @@ static void hashIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pResul
 //  updateResultRowInfoActiveIndex(pResultRowInfo, &pInfo->win, pRuntimeEnv->current->lastKey, true, false);
 }
 
-
 static void hashAllIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pResultRowInfo, SSDataBlock* pSDataBlock, int32_t tableGroupId) {
   STableIntervalOperatorInfo* pInfo = (STableIntervalOperatorInfo*) pOperatorInfo->info;
 
@@ -3276,10 +3313,9 @@ void switchCtxOrder(SqlFunctionCtx* pCtx, int32_t numOfOutput) {
   }
 }
 
+// TODO fix this bug.
 int32_t initResultRow(SResultRow *pResultRow) {
   pResultRow->pEntryInfo = (struct SResultRowEntryInfo*)((char*)pResultRow + sizeof(SResultRow));
-  pResultRow->pageId    = -1;
-  pResultRow->offset    = -1;
   return TSDB_CODE_SUCCESS;
 }
 
@@ -3335,7 +3371,7 @@ void setFunctionResultOutput(SOptrBasicInfo* pInfo, SAggSupporter* pSup, int32_t
 
   int64_t tid = 0;
   int64_t groupId = 0;
-  SResultRow* pRow = doSetResultOutBufByKey_rv(pResultRowInfo, tid, (char *)&tid, sizeof(tid), true, groupId, pTaskInfo, false, pSup);
+  SResultRow* pRow = doSetResultOutBufByKey_rv(NULL, pResultRowInfo, tid, (char *)&tid, sizeof(tid), true, groupId, pTaskInfo, false, pSup);
 
   for (int32_t i = 0; i < pDataBlock->info.numOfCols; ++i) {
     SColumnInfoData* pData = taosArrayGet(pDataBlock->pDataBlock, i);
@@ -3476,48 +3512,44 @@ static void setupEnvForReverseScan(STableScanInfo *pTableScanInfo, SqlFunctionCt
   pTableScanInfo->reverseTimes = 0;
 }
 
-void finalizeQueryResult(SOperatorInfo* pOperator, SqlFunctionCtx* pCtx, SResultRowInfo* pResultRowInfo, int32_t* rowCellInfoOffset) {
-  int32_t numOfOutput = pOperator->numOfOutput;
-//  if (pQueryAttr->groupbyColumn || QUERY_IS_INTERVAL_QUERY(pQueryAttr) || pQueryAttr->sw.gap > 0 || pQueryAttr->stateWindow) {
-//    // for each group result, call the finalize function for each column
-//    if (pQueryAttr->groupbyColumn) {
-//      closeAllResultRows(pResultRowInfo);
-//    }
-//
-//    for (int32_t i = 0; i < pResultRowInfo->size; ++i) {
-//      SResultRow *buf = pResultRowInfo->pResult[i];
-//      if (!isResultRowClosed(pResultRowInfo, i)) {
-//        continue;
-//      }
-//
-//      setResultOutputBuf(pRuntimeEnv, buf, pCtx, numOfOutput, rowCellInfoOffset);
-//
-//      for (int32_t j = 0; j < numOfOutput; ++j) {
-////        pCtx[j].startTs  = buf->win.skey;
-////        if (pCtx[j].functionId < 0) {
-////          doInvokeUdf(pRuntimeEnv->pUdfInfo, &pCtx[j], 0, TSDB_UDF_FUNC_FINALIZE);
-////        } else {
-////          aAggs[pCtx[j].functionId].xFinalize(&pCtx[j]);
-////        }
-//      }
-//
-//
-//      /*
-//       * set the number of output results for group by normal columns, the number of output rows usually is 1 except
-//       * the top and bottom query
-//       */
-//      buf->numOfRows = (uint16_t)getNumOfResult(pCtx, numOfOutput);
-//    }
-//
-//  } else {
-    for (int32_t j = 0; j < numOfOutput; ++j) {
-//      if (pCtx[j].functionId < 0) {
-//        doInvokeUdf(pRuntimeEnv->pUdfInfo, &pCtx[j], 0, TSDB_UDF_FUNC_FINALIZE);
-//      } else {
-        pCtx[j].fpSet.finalize(&pCtx[j]);
-//      }
+void finalizeQueryResult(SqlFunctionCtx* pCtx, int32_t numOfOutput) {
+  for (int32_t j = 0; j < numOfOutput; ++j) {
+    pCtx[j].fpSet.finalize(&pCtx[j]);
+  }
+}
+
+void finalizeMultiTupleQueryResult(SqlFunctionCtx* pCtx, int32_t numOfOutput, SDiskbasedBuf *pBuf, SResultRowInfo* pResultRowInfo, int32_t* rowCellInfoOffset) {
+  for (int32_t i = 0; i < pResultRowInfo->size; ++i) {
+    SResultRowPosition* pPos = &pResultRowInfo->pPosition[i];
+
+    SFilePage* bufPage = getBufPage(pBuf, pPos->pageId);
+    SResultRow* pRow = (SResultRow*)((char*)bufPage + pPos->offset);
+    if (!isResultRowClosed(pResultRowInfo, i)) {
+      continue;
     }
-//  }
+
+    for (int32_t j = 0; j < numOfOutput; ++j) {
+      pCtx[j].resultInfo = getResultCell(pRow, j, rowCellInfoOffset);
+
+      struct SResultRowEntryInfo* pResInfo = pCtx[i].resultInfo;
+      if (isRowEntryCompleted(pResInfo) && isRowEntryInitialized(pResInfo)) {
+        continue;
+      }
+
+      pCtx[j].fpSet.finalize(&pCtx[j]);
+
+      if (pRow->numOfRows < pResInfo->numOfRes) {
+        pRow->numOfRows = pResInfo->numOfRes;
+      }
+    }
+
+    releaseBufPage(pBuf, bufPage);
+    /*
+     * set the number of output results for group by normal columns, the number of output rows usually is 1 except
+     * the top and bottom query
+     */
+//    buf->numOfRows = (uint16_t)getNumOfResult(pCtx, numOfOutput);
+  }
 }
 
 static bool hasMainOutput(STaskAttr *pQueryAttr) {
@@ -3612,31 +3644,29 @@ void setResultRowOutputBufInitCtx_rv(SDiskbasedBuf * pBuf, SResultRow *pResult,
   // Note: pResult->pos[i]->num == 0, there is only fixed number of results for each group
   SFilePage* bufPage = getBufPage(pBuf, pResult->pageId);
 
-  int32_t offset = 0;
+//  int32_t offset = 0;
   for (int32_t i = 0; i < numOfOutput; ++i) {
     pCtx[i].resultInfo = getResultCell(pResult, i, rowCellInfoOffset);
 
     struct SResultRowEntryInfo* pResInfo = pCtx[i].resultInfo;
     if (isRowEntryCompleted(pResInfo) && isRowEntryInitialized(pResInfo)) {
-      offset += pCtx[i].resDataInfo.bytes;
+//      offset += pCtx[i].resDataInfo.bytes;
       continue;
     }
 
-    pCtx[i].pOutput = getPosInResultPage_rv(bufPage, pResult->offset, offset);
-    offset += pCtx[i].resDataInfo.bytes;
+//    offset += pCtx[i].resDataInfo.bytes;
 
-    int32_t functionId = pCtx[i].functionId;
-    if (functionId < 0) {
-      continue;
+//    int32_t functionId = pCtx[i].functionId;
+//    if (functionId < 0) {
+//      continue;
+//    }
+//    if (functionId == FUNCTION_TOP || functionId == FUNCTION_BOTTOM || functionId == FUNCTION_DIFF) {
+//      if (i > 0) pCtx[i].ptsOutputBuf = pCtx[i - 1].pOutput;
+//    }
+
+    if (!pResInfo->initialized) {
+      pCtx[i].fpSet.init(&pCtx[i], pResInfo);
     }
-
-    if (functionId == FUNCTION_TOP || functionId == FUNCTION_BOTTOM || functionId == FUNCTION_DIFF) {
-      if (i > 0) pCtx[i].ptsOutputBuf = pCtx[i - 1].pOutput;
-    }
-
-    //    if (!pResInfo->initialized) {
-    //      aAggs[functionId].init(&pCtx[i], pResInfo);
-    //    }
   }
 }
 
@@ -3650,7 +3680,7 @@ void doSetTableGroupOutputBuf(SAggOperatorInfo* pAggInfo, int32_t numOfOutput, i
   int32_t* rowCellInfoOffset = pAggInfo->binfo.rowCellInfoOffset;
 
   SResultRow* pResultRow =
-      doSetResultOutBufByKey_rv(pResultRowInfo, tid, (char*)&tableGroupId, sizeof(tableGroupId), true, uid, pTaskInfo, false, &pAggInfo->aggSup);
+      doSetResultOutBufByKey_rv(pAggInfo->pResultBuf, pResultRowInfo, tid, (char*)&tableGroupId, sizeof(tableGroupId), true, uid, pTaskInfo, false, &pAggInfo->aggSup);
   assert (pResultRow != NULL);
 
   /*
@@ -3891,8 +3921,7 @@ void setIntervalQueryRange(STaskRuntimeEnv *pRuntimeEnv, TSKEY key) {
  * @param pQInfo
  * @param result
  */
-
-static int32_t doCopyToSDataBlock(SDiskbasedBuf *pBuf, SGroupResInfo* pGroupResInfo, int32_t orderType, SSDataBlock* pBlock, int32_t rowCapacity) {
+static int32_t doCopyToSDataBlock(SDiskbasedBuf *pBuf, SGroupResInfo* pGroupResInfo, int32_t orderType, SSDataBlock* pBlock, int32_t rowCapacity, int32_t* rowCellOffset) {
   int32_t numOfRows = getNumOfTotalRes(pGroupResInfo);
   int32_t numOfResult = pBlock->info.rows; // there are already exists result rows
 
@@ -3910,13 +3939,19 @@ static int32_t doCopyToSDataBlock(SDiskbasedBuf *pBuf, SGroupResInfo* pGroupResI
     step = -1;
   }
 
+  int32_t nrows = pBlock->info.rows;
+
   for (int32_t i = start; (i < numOfRows) && (i >= 0); i += step) {
-    SResultRow* pRow = taosArrayGetP(pGroupResInfo->pRows, i);
+    SResultRowPosition* pPos = taosArrayGet(pGroupResInfo->pRows, i);
+    SFilePage *page = getBufPage(pBuf, pPos->pageId);
+
+    SResultRow* pRow = (SResultRow*)((char*)page + pPos->offset);
     if (pRow->numOfRows == 0) {
       pGroupResInfo->index += 1;
       continue;
     }
 
+    // TODO copy multiple rows?
     int32_t numOfRowsToCopy = pRow->numOfRows;
     if (numOfResult + numOfRowsToCopy  >= rowCapacity) {
       break;
@@ -3924,20 +3959,17 @@ static int32_t doCopyToSDataBlock(SDiskbasedBuf *pBuf, SGroupResInfo* pGroupResI
 
     pGroupResInfo->index += 1;
 
-    SFilePage *page = getBufPage(pBuf, pRow->pageId);
-
-    int32_t offset = 0;
     for (int32_t j = 0; j < pBlock->info.numOfCols; ++j) {
       SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, j);
-      int32_t bytes = pColInfoData->info.bytes;
+      SResultRowEntryInfo* pEntryInfo = getResultCell(pRow, j, rowCellOffset);
 
-      char *out = pColInfoData->pData + numOfResult * bytes;
-      char *in  = getPosInResultPage_rv(page, pRow->offset, offset);
-      memcpy(out, in, bytes * numOfRowsToCopy);
-
-      offset += bytes;
+      char* in = GET_ROWCELL_INTERBUF(pEntryInfo);
+      colDataAppend(pColInfoData, nrows, in, pEntryInfo->numOfRes == 0);
     }
 
+    releaseBufPage(pBuf, page);
+    nrows += 1;
+
     numOfResult += numOfRowsToCopy;
     if (numOfResult == rowCapacity) {  // output buffer is full
       break;
@@ -3949,16 +3981,16 @@ static int32_t doCopyToSDataBlock(SDiskbasedBuf *pBuf, SGroupResInfo* pGroupResI
   return 0;
 }
 
-static void toSDatablock(SGroupResInfo *pGroupResInfo, SDiskbasedBuf* pBuf, SSDataBlock* pBlock, int32_t rowCapacity) {
+static void toSDatablock(SGroupResInfo *pGroupResInfo, SDiskbasedBuf* pBuf, SSDataBlock* pBlock, int32_t rowCapacity, int32_t* rowCellOffset) {
   assert(pGroupResInfo->currentGroup <= pGroupResInfo->totalGroup);
 
-  pBlock->info.rows = 0;
+  blockDataClearup(pBlock);
   if (!hasRemainDataInCurrentGroup(pGroupResInfo)) {
     return;
   }
 
   int32_t orderType = TSDB_ORDER_ASC;//(pQueryAttr->pGroupbyExpr != NULL) ? pQueryAttr->pGroupbyExpr->orderType : TSDB_ORDER_ASC;
-  doCopyToSDataBlock(pBuf, pGroupResInfo, orderType, pBlock, rowCapacity);
+  doCopyToSDataBlock(pBuf, pGroupResInfo, orderType, pBlock, rowCapacity, rowCellOffset);
 
   // add condition (pBlock->info.rows >= 1) just to runtime happy
   blockDataUpdateTsWindow(pBlock);
@@ -5173,9 +5205,8 @@ static SSDataBlock* doLoadRemoteData(SOperatorInfo *pOperator, bool* newgroup) {
   SExchangeInfo *pExchangeInfo = pOperator->info;
   SExecTaskInfo *pTaskInfo = pOperator->pTaskInfo;
 
-  int32_t code = pOperator->_openFn(pOperator);
-  if (code != TSDB_CODE_SUCCESS) {
-    pTaskInfo->code = code;
+  pTaskInfo->code = pOperator->_openFn(pOperator);
+  if (pTaskInfo->code != TSDB_CODE_SUCCESS) {
     return NULL;
   }
 
@@ -5761,7 +5792,7 @@ static void appendOneRowToDataBlock(SSDataBlock *pBlock, STupleHandle* pTupleHan
 }
 
 static SSDataBlock* getSortedBlockData(SSortHandle* pHandle, SSDataBlock* pDataBlock, bool hasVarCol, int32_t capacity) {
-  blockDataClearup(pDataBlock, hasVarCol);
+  blockDataClearup(pDataBlock);
 
   while(1) {
     STupleHandle* pTupleHandle = tsortNextTuple(pHandle);
@@ -5917,7 +5948,7 @@ static SSDataBlock* doMerge(SOperatorInfo* pOperator) {
 
   while(1) {
 
-    blockDataClearup(pDataBlock, pInfo->hasVarCol);
+    blockDataClearup(pDataBlock);
     while (1) {
       STupleHandle* pTupleHandle = tsortNextTuple(pHandle);
       if (pTupleHandle == NULL) {
@@ -6234,7 +6265,7 @@ static int32_t doOpenAggregateOptr(SOperatorInfo *pOperator) {
     doAggregateImpl(pOperator, 0, pInfo->pCtx);
   }
 
-  finalizeQueryResult(pOperator, pInfo->pCtx, &pInfo->resultRowInfo, pInfo->rowCellInfoOffset);
+  finalizeQueryResult(pInfo->pCtx, pOperator->numOfOutput);
 
   OPTR_SET_OPENED(pOperator);
   return TSDB_CODE_SUCCESS;
@@ -6270,7 +6301,7 @@ static SSDataBlock* doMultiTableAggregate(SOperatorInfo *pOperator, bool* newgro
   SExecTaskInfo* pTaskInfo = pOperator->pTaskInfo;
 
   if (pOperator->status == OP_RES_TO_RETURN) {
-    toSDatablock(&pAggInfo->groupResInfo, pAggInfo->pResultBuf, pInfo->pRes, pAggInfo->binfo.capacity);
+    toSDatablock(&pAggInfo->groupResInfo, pAggInfo->pResultBuf, pInfo->pRes, pAggInfo->binfo.capacity, pAggInfo->binfo.rowCellInfoOffset);
 
     if (pInfo->pRes->info.rows == 0 || !hasRemainDataInCurrentGroup(&pAggInfo->groupResInfo)) {
       pOperator->status = OP_EXEC_DONE;
@@ -6319,7 +6350,7 @@ static SSDataBlock* doMultiTableAggregate(SOperatorInfo *pOperator, bool* newgro
   updateNumOfRowsInResultRows(pInfo->pCtx, pOperator->numOfOutput, &pInfo->resultRowInfo, pInfo->rowCellInfoOffset);
 
   initGroupResInfo(&pAggInfo->groupResInfo, &pInfo->resultRowInfo);
-  toSDatablock(&pAggInfo->groupResInfo, pAggInfo->pResultBuf, pInfo->pRes, pAggInfo->binfo.capacity);
+  toSDatablock(&pAggInfo->groupResInfo, pAggInfo->pResultBuf, pInfo->pRes, pAggInfo->binfo.capacity, pAggInfo->binfo.rowCellInfoOffset);
 
   if (pInfo->pRes->info.rows == 0 || !hasRemainDataInCurrentGroup(&pAggInfo->groupResInfo)) {
     doSetOperatorCompleted(pOperator);
@@ -6333,7 +6364,7 @@ static SSDataBlock* doProjectOperation(SOperatorInfo *pOperator, bool* newgroup)
   SOptrBasicInfo *pInfo = &pProjectInfo->binfo;
 
   SSDataBlock* pRes = pInfo->pRes;
-  blockDataClearup(pRes, pProjectInfo->hasVarCol);
+  blockDataClearup(pRes);
 
   if (pProjectInfo->existDataBlock) {  // TODO refactor
 //    STableQueryInfo* pTableQueryInfo = pRuntimeEnv->current;
@@ -6496,53 +6527,57 @@ static SSDataBlock* doFilter(void* param, bool* newgroup) {
   return NULL;
 }
 
-static SSDataBlock* doIntervalAgg(SOperatorInfo *pOperator, bool* newgroup) {
-  if (pOperator->status == OP_EXEC_DONE) {
-    return NULL;
+static int32_t doOpenIntervalAgg(SOperatorInfo *pOperator) {
+  if (OPTR_IS_OPENED(pOperator)) {
+    return TSDB_CODE_SUCCESS;
   }
 
   STableIntervalOperatorInfo* pInfo = pOperator->info;
 
-  if (pOperator->status == OP_RES_TO_RETURN) {
-//    toSDatablock(pAggInfo->pGroupResInfo, pAggInfo->pResultBuf, pInfo->pRes, pAggInfo->binfo.capacity);
-    if (pInfo->binfo.pRes->info.rows == 0 || !hasRemainDataInCurrentGroup(&pInfo->groupResInfo)) {
-      doSetOperatorCompleted(pOperator);
-    }
-
-    return pInfo->binfo.pRes;
-  }
-
-//  int32_t order = pQueryAttr->order.order;
-//  STimeWindow win = pQueryAttr->window;
+  //  int32_t order = pQueryAttr->order.order;
+  //  STimeWindow win = pQueryAttr->window;
+  bool newgroup = false;
   SOperatorInfo* downstream = pOperator->pDownstream[0];
 
-  while(1) {
+  while (1) {
     publishOperatorProfEvent(downstream, QUERY_PROF_BEFORE_OPERATOR_EXEC);
-    SSDataBlock* pBlock = downstream->getNextFn(downstream, newgroup);
+    SSDataBlock* pBlock = downstream->getNextFn(downstream, &newgroup);
     publishOperatorProfEvent(downstream, QUERY_PROF_AFTER_OPERATOR_EXEC);
 
     if (pBlock == NULL) {
       break;
     }
 
-//    setTagValue(pOperator, pRuntimeEnv->current->pTable, pInfo->pCtx, pOperator->numOfOutput);
+    //    setTagValue(pOperator, pRuntimeEnv->current->pTable, pInfo->pCtx, pOperator->numOfOutput);
 
     // the pDataBlock are always the same one, no need to call this again
     setInputDataBlock(pOperator, pInfo->binfo.pCtx, pBlock, TSDB_ORDER_ASC);
     hashIntervalAgg(pOperator, &pInfo->binfo.resultRowInfo, pBlock, 0);
   }
 
-  // restore the value
-//  pQueryAttr->order.order = order;
-//  pQueryAttr->window = win;
-
-  pOperator->status = OP_RES_TO_RETURN;
   closeAllResultRows(&pInfo->binfo.resultRowInfo);
-  setTaskStatus(pOperator->pTaskInfo, TASK_COMPLETED);
-  finalizeQueryResult(pOperator, pInfo->binfo.pCtx, &pInfo->binfo.resultRowInfo, pInfo->binfo.rowCellInfoOffset);
+  finalizeMultiTupleQueryResult(pInfo->binfo.pCtx, pOperator->numOfOutput, pInfo->pResultBuf, &pInfo->binfo.resultRowInfo, pInfo->binfo.rowCellInfoOffset);
 
   initGroupResInfo(&pInfo->groupResInfo, &pInfo->binfo.resultRowInfo);
-  toSDatablock(&pInfo->groupResInfo, pInfo->pResultBuf, pInfo->binfo.pRes, pInfo->binfo.capacity);
+  OPTR_SET_OPENED(pOperator);
+  return TSDB_CODE_SUCCESS;
+}
+
+static SSDataBlock* doIntervalAgg(SOperatorInfo *pOperator, bool* newgroup) {
+  STableIntervalOperatorInfo* pInfo = pOperator->info;
+  SExecTaskInfo* pTaskInfo = pOperator->pTaskInfo;
+
+  if (pOperator->status == OP_EXEC_DONE) {
+    return NULL;
+  }
+
+  pTaskInfo->code = pOperator->_openFn(pOperator);
+  if (pTaskInfo->code != TSDB_CODE_SUCCESS) {
+    return NULL;
+  }
+
+  blockDataEnsureCapacity(pInfo->binfo.pRes, pInfo->binfo.capacity);
+  toSDatablock(&pInfo->groupResInfo, pInfo->pResultBuf, pInfo->binfo.pRes, pInfo->binfo.capacity, pInfo->binfo.rowCellInfoOffset);
 
   if (pInfo->binfo.pRes->info.rows == 0 || !hasRemainDataInCurrentGroup(&pInfo->groupResInfo)) {
     doSetOperatorCompleted(pOperator);
@@ -6598,7 +6633,7 @@ static SSDataBlock* doAllIntervalAgg(SOperatorInfo *pOperator, bool* newgroup) {
   pOperator->status = OP_RES_TO_RETURN;
   closeAllResultRows(&pIntervalInfo->binfo.resultRowInfo);
   setTaskStatus(pOperator->pTaskInfo, TASK_COMPLETED);
-  finalizeQueryResult(pOperator, pIntervalInfo->binfo.pCtx, &pIntervalInfo->binfo.resultRowInfo, pIntervalInfo->binfo.rowCellInfoOffset);
+  finalizeQueryResult(pIntervalInfo->binfo.pCtx, pOperator->numOfOutput);
 
   initGroupResInfo(&pRuntimeEnv->groupResInfo, &pIntervalInfo->binfo.resultRowInfo);
 //  toSDatablock(&pRuntimeEnv->groupResInfo, pRuntimeEnv, pIntervalInfo->pRes);
@@ -6847,7 +6882,7 @@ static SSDataBlock* doStateWindowAgg(SOperatorInfo *pOperator, bool* newgroup) {
   pOperator->status = OP_RES_TO_RETURN;
   closeAllResultRows(&pBInfo->resultRowInfo);
   setTaskStatus(pOperator->pTaskInfo, TASK_COMPLETED);
-  finalizeQueryResult(pOperator, pBInfo->pCtx, &pBInfo->resultRowInfo, pBInfo->rowCellInfoOffset);
+  finalizeQueryResult(pBInfo->pCtx, pOperator->numOfOutput);
 
   initGroupResInfo(&pRuntimeEnv->groupResInfo, &pBInfo->resultRowInfo);
 //  toSDatablock(&pRuntimeEnv->groupResInfo, pRuntimeEnv, pBInfo->pRes);
@@ -6896,7 +6931,7 @@ static SSDataBlock* doSessionWindowAgg(SOperatorInfo *pOperator, bool* newgroup)
   pOperator->status = OP_RES_TO_RETURN;
   closeAllResultRows(&pBInfo->resultRowInfo);
 //  setTaskStatus(pOperator->pTaskInfo, QUERY_COMPLETED);
-  finalizeQueryResult(pOperator, pBInfo->pCtx, &pBInfo->resultRowInfo, pBInfo->rowCellInfoOffset);
+  finalizeQueryResult(pBInfo->pCtx, pOperator->numOfOutput);
 
 //  initGroupResInfo(&pBInfo->groupResInfo, &pBInfo->resultRowInfo);
 //  toSDatablock(&pRuntimeEnv->groupResInfo, pRuntimeEnv, pBInfo->pRes);
@@ -6950,7 +6985,7 @@ static SSDataBlock* hashGroupbyAggregate(SOperatorInfo *pOperator, bool* newgrou
 //  setTaskStatus(pOperator->pTaskInfo, QUERY_COMPLETED);
 
   if (!pRuntimeEnv->pQueryAttr->stableQuery) { // finalize include the update of result rows
-    finalizeQueryResult(pOperator, pInfo->binfo.pCtx, &pInfo->binfo.resultRowInfo, pInfo->binfo.rowCellInfoOffset);
+    finalizeQueryResult(pInfo->binfo.pCtx, pOperator->numOfOutput);
   } else {
     updateNumOfRowsInResultRows(pInfo->binfo.pCtx, pOperator->numOfOutput, &pInfo->binfo.resultRowInfo, pInfo->binfo.rowCellInfoOffset);
   }
@@ -7109,11 +7144,11 @@ int32_t doInitAggInfoSup(SAggSupporter* pAggSup, SqlFunctionCtx *pCtx, int32_t n
   pAggSup->keyBuf              = calloc(1, sizeof(int64_t) + sizeof(int64_t) + POINTER_BYTES);
   pAggSup->pResultRowHashTable = taosHashInit(10, hashFn, true, HASH_NO_LOCK);
   pAggSup->pResultRowListSet   = taosHashInit(100, hashFn, false, HASH_NO_LOCK);
-  pAggSup->pool                = initResultRowPool(pAggSup->resultRowSize);
+//  pAggSup->pool                = initResultRowPool(pAggSup->resultRowSize);
   pAggSup->pResultRowArrayList = taosArrayInit(10, sizeof(SResultRowCell));
 
   if (pAggSup->keyBuf == NULL || pAggSup->pResultRowArrayList == NULL || pAggSup->pResultRowListSet == NULL ||
-      pAggSup->pResultRowHashTable == NULL || pAggSup->pool == NULL) {
+      pAggSup->pResultRowHashTable == NULL) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
 
@@ -7125,7 +7160,7 @@ static void cleanupAggSup(SAggSupporter* pAggSup) {
   taosHashCleanup(pAggSup->pResultRowHashTable);
   taosHashCleanup(pAggSup->pResultRowListSet);
   taosArrayDestroy(pAggSup->pResultRowArrayList);
-  destroyResultRowPool(pAggSup->pool);
+//  destroyResultRowPool(pAggSup->pool);
 }
 
 static int32_t initAggInfo(SOptrBasicInfo* pBasicInfo, SAggSupporter* pAggSup, SExprInfo* pExprInfo, int32_t numOfCols,
@@ -7448,7 +7483,7 @@ SOperatorInfo* createLimitOperatorInfo(SOperatorInfo* downstream, int32_t numOfD
 }
 
 SOperatorInfo* createIntervalOperatorInfo(SOperatorInfo* downstream, SExprInfo* pExprInfo, int32_t numOfCols, SSDataBlock* pResBlock, SInterval* pInterval,
-const STableGroupInfo* pTableGroupInfo, SExecTaskInfo* pTaskInfo) {
+                                          const STableGroupInfo* pTableGroupInfo, SExecTaskInfo* pTaskInfo) {
   STableIntervalOperatorInfo* pInfo = calloc(1, sizeof(STableIntervalOperatorInfo));
   SOperatorInfo* pOperator = calloc(1, sizeof(SOperatorInfo));
   if (pInfo == NULL || pOperator == NULL) {
@@ -7460,7 +7495,10 @@ const STableGroupInfo* pTableGroupInfo, SExecTaskInfo* pTaskInfo) {
   pInfo->win       = pTaskInfo->window;
   pInfo->interval  = *pInterval;
 
-  int32_t numOfRows = 1;
+  pInfo->win.skey = INT64_MIN;
+  pInfo->win.ekey = INT64_MAX;
+
+  int32_t numOfRows = 4096;
   int32_t code = initAggInfo(&pInfo->binfo, &pInfo->aggSup, pExprInfo, numOfCols, numOfRows, pResBlock);
 //  pInfo->pTableQueryInfo = initTableQueryInfo(pTableGroupInfo);
   if (code != TSDB_CODE_SUCCESS/* || pInfo->pTableQueryInfo == NULL*/) {
@@ -7483,7 +7521,7 @@ const STableGroupInfo* pTableGroupInfo, SExecTaskInfo* pTaskInfo) {
   pOperator->pTaskInfo    = pTaskInfo;
   pOperator->numOfOutput  = numOfCols;
   pOperator->info         = pInfo;
-  pOperator->_openFn      = operatorDummyOpenFn;
+  pOperator->_openFn      = doOpenIntervalAgg;
   pOperator->getNextFn    = doIntervalAgg;
   pOperator->closeFn      = destroyIntervalOperatorInfo;
 
@@ -8304,10 +8342,14 @@ SOperatorInfo* doCreateOperatorTreeNode(SPhysiNode* pPhyNode, SExecTaskInfo* pTa
       SPhysiNode*    pChildNode = (SPhysiNode*)nodesListGetNode(pPhyNode->pChildren, i);
       SOperatorInfo* op = doCreateOperatorTreeNode(pChildNode, pTaskInfo, pHandle, queryId, taskId, pTableGroupInfo);
 
+      SIntervalPhysiNode* pIntervalPhyNode = (SIntervalPhysiNode*)pPhyNode;
+
       int32_t num = 0;
-      SExprInfo* pExprInfo = createExprInfo(((SIntervalPhysiNode*)pPhyNode)->pFuncs, &num);
+      SExprInfo* pExprInfo = createExprInfo(pIntervalPhyNode->pFuncs, &num);
       SSDataBlock* pResBlock = createOutputBuf_rv1(pPhyNode->pOutputDataBlockDesc);
-      return createIntervalOperatorInfo(op, pExprInfo, num, pResBlock, NULL, pTableGroupInfo, pTaskInfo);
+
+      SInterval interval = {.interval = pIntervalPhyNode->interval, .sliding = pIntervalPhyNode->sliding, .intervalUnit = 'a', .slidingUnit = 'a'};
+      return createIntervalOperatorInfo(op, pExprInfo, num, pResBlock, &interval, pTableGroupInfo, pTaskInfo);
     }
   } /*else if (pPhyNode->info.type == OP_MultiTableAggregate) {
     size_t size = taosArrayGetSize(pPhyNode->pChildren);
diff --git a/source/libs/executor/src/tsort.c b/source/libs/executor/src/tsort.c
index 34dd248ba7..08bab762be 100644
--- a/source/libs/executor/src/tsort.c
+++ b/source/libs/executor/src/tsort.c
@@ -37,7 +37,6 @@ typedef struct SSortHandle {
 
   SArray           *pOrderInfo;
   bool              nullFirst;
-  bool              hasVarCol;
   SArray           *pOrderedSource;
 
   _sort_fetch_block_fn_t  fetchfp;
@@ -77,6 +76,10 @@ static SSDataBlock* createDataBlock_rv(SSchema* pSchema, int32_t numOfCols) {
     colInfo.info.bytes = pSchema[i].bytes;
     colInfo.info.colId = pSchema[i].colId;
     taosArrayPush(pBlock->pDataBlock, &colInfo);
+
+    if (IS_VAR_DATA_TYPE(colInfo.info.type)) {
+      pBlock->info.hasVarCol = true;
+    }
   }
 
   return pBlock;
@@ -155,7 +158,7 @@ static int32_t doAddToBuf(SSDataBlock* pDataBlock, SSortHandle* pHandle) {
 
   while(start < pDataBlock->info.rows) {
     int32_t stop = 0;
-    blockDataSplitRows(pDataBlock, pHandle->hasVarCol, start, &stop, pHandle->pageSize);
+    blockDataSplitRows(pDataBlock, pDataBlock->info.hasVarCol, start, &stop, pHandle->pageSize);
     SSDataBlock* p = blockDataExtractBlock(pDataBlock, start, stop - start + 1);
     if (p == NULL) {
       return terrno;
@@ -179,7 +182,7 @@ static int32_t doAddToBuf(SSDataBlock* pDataBlock, SSortHandle* pHandle) {
     start = stop + 1;
   }
 
-  blockDataClearup(pDataBlock, pHandle->hasVarCol);
+  blockDataClearup(pDataBlock);
 
   SSDataBlock* pBlock = createOneDataBlock(pDataBlock);
   int32_t code = doAddNewExternalMemSource(pHandle->pBuf, pHandle->pOrderedSource, pBlock, &pHandle->sourceId);
@@ -309,7 +312,7 @@ static int32_t adjustMergeTreeForNextTuple(SExternalMemSource *pSource, SMultiwa
 }
 
 static SSDataBlock* getSortedBlockData(SSortHandle* pHandle, SMsortComparParam* cmpParam, int32_t capacity) {
-  blockDataClearup(pHandle->pDataBlock, pHandle->hasVarCol);
+  blockDataClearup(pHandle->pDataBlock);
 
   while(1) {
     if (cmpParam->numOfSources == pHandle->numOfCompletedSources) {
@@ -475,7 +478,7 @@ static int32_t doInternalMergeSort(SSortHandle* pHandle) {
         setBufPageDirty(pPage, true);
         releaseBufPage(pHandle->pBuf, pPage);
 
-        blockDataClearup(pDataBlock, pHandle->hasVarCol);
+        blockDataClearup(pDataBlock);
       }
 
       tMergeTreeDestroy(pHandle->pMergeTree);
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index aaaee6d56c..78e0e9f8e7 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -52,10 +52,6 @@ static void doFinalizer(SResultRowEntryInfo* pResInfo) { cleanupResultRowEntry(p
 
 void functionFinalizer(SqlFunctionCtx *pCtx) {
   SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
-  if (pResInfo->hasResult != DATA_SET_FLAG) {
-//    setNull(pCtx->pOutput, pCtx->resDataInfo.type, pCtx->resDataInfo.bytes);
-  }
-
   doFinalizer(pResInfo);
 }
 
diff --git a/source/libs/planner/src/planLogicCreater.c b/source/libs/planner/src/planLogicCreater.c
index 7520ea3c9e..3fae580de9 100644
--- a/source/libs/planner/src/planLogicCreater.c
+++ b/source/libs/planner/src/planLogicCreater.c
@@ -310,9 +310,12 @@ static SLogicNode* createWindowLogicNodeByInterval(SLogicPlanContext* pCxt, SInt
   pWindow->node.id = pCxt->planNodeId++;
 
   pWindow->winType = WINDOW_TYPE_INTERVAL;
-  pWindow->interval = ((SValueNode*)pInterval->pInterval)->datum.i;
+  SValueNode* pIntervalNode = (SValueNode*)((SRawExprNode*)(pInterval->pInterval))->pNode;
+
+  pWindow->interval = pIntervalNode->datum.i;
   pWindow->offset = (NULL != pInterval->pOffset ? ((SValueNode*)pInterval->pOffset)->datum.i : 0);
-  pWindow->sliding = (NULL != pInterval->pSliding ? ((SValueNode*)pInterval->pSliding)->datum.i : 0);
+  pWindow->sliding = (NULL != pInterval->pSliding ? ((SValueNode*)pInterval->pSliding)->datum.i : pWindow->interval);
+
   if (NULL != pInterval->pFill) {
     pWindow->pFill = nodesCloneNode(pInterval->pFill);
     CHECK_ALLOC(pWindow->pFill, (SLogicNode*)pWindow);