diff --git a/include/util/tpagedbuf.h b/include/util/tpagedbuf.h
index 708c6cf741..c1c246dd64 100644
--- a/include/util/tpagedbuf.h
+++ b/include/util/tpagedbuf.h
@@ -55,7 +55,7 @@ typedef struct SDiskbasedBufStatis {
  * @param handle
  * @return
  */
-int32_t createDiskbasedBuffer(SDiskbasedBuf** pBuf, int32_t pagesize, int32_t inMemBufSize, uint64_t qId, const char* dir);
+int32_t createDiskbasedBuf(SDiskbasedBuf** pBuf, int32_t pagesize, int32_t inMemBufSize, uint64_t qId, const char* dir);
 
 /**
  *
@@ -108,13 +108,13 @@ size_t getTotalBufSize(const SDiskbasedBuf* pBuf);
  * @param pBuf
  * @return
  */
-size_t getNumOfResultBufGroupId(const SDiskbasedBuf* pBuf);
+size_t getNumOfBufGroupId(const SDiskbasedBuf* pBuf);
 
 /**
  * destroy result buffer
  * @param pBuf
  */
-void destroyResultBuf(SDiskbasedBuf* pBuf);
+void destroyDiskbasedBuf(SDiskbasedBuf* pBuf);
 
 /**
  *
diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index c5706c7e59..c7111f987d 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -627,7 +627,7 @@ SOperatorInfo* createFilterOperatorInfo(STaskRuntimeEnv* pRuntimeEnv, SOperatorI
 SOperatorInfo* createJoinOperatorInfo(SOperatorInfo** pdownstream, int32_t numOfDownstream, SSchema* pSchema,
                                       int32_t numOfOutput);
 SOperatorInfo* createOrderOperatorInfo(SOperatorInfo* downstream, SArray* pExprInfo, SArray* pOrderVal, SExecTaskInfo* pTaskInfo);
-SOperatorInfo* createSortedMergeOperatorInfo(SOperatorInfo** downstream, int32_t numOfDownstream, SArray* pExprInfo, void* param, SArray* pOrderVal, SExecTaskInfo* pTaskInfo);
+SOperatorInfo* createSortedMergeOperatorInfo(SOperatorInfo** downstream, int32_t numOfDownstream, SArray* pExprInfo, SArray* pOrderVal, SExecTaskInfo* pTaskInfo);
 
 // SSDataBlock* doGlobalAggregate(void* param, bool* newgroup);
 // SSDataBlock* doMultiwayMergeSort(void* param, bool* newgroup);
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 75ba620738..c7c72e615d 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -2215,7 +2215,7 @@ static void teardownQueryRuntimeEnv(STaskRuntimeEnv *pRuntimeEnv) {
 
   destroyScalarFuncSupport(pRuntimeEnv->scalarSup, pQueryAttr->numOfOutput);
 //  destroyUdfInfo(pRuntimeEnv->pUdfInfo);
-  destroyResultBuf(pRuntimeEnv->pResultBuf);
+  destroyDiskbasedBuf(pRuntimeEnv->pResultBuf);
   doFreeQueryHandle(pRuntimeEnv);
 
   destroyTsComp(pRuntimeEnv, pQueryAttr);
@@ -4629,7 +4629,7 @@ int32_t doInitQInfo(SQInfo* pQInfo, STSBuf* pTsBuf, void* tsdb, void* sourceOptr
   getIntermediateBufInfo(pRuntimeEnv, &ps, &pQueryAttr->intermediateResultRowSize);
 
   int32_t TENMB = 1024*1024*10;
-  int32_t code = createDiskbasedBuffer(&pRuntimeEnv->pResultBuf, ps, TENMB, pQInfo->qId, tsTempDir);
+  int32_t code = createDiskbasedBuf(&pRuntimeEnv->pResultBuf, ps, TENMB, pQInfo->qId, tsTempDir);
   if (code != TSDB_CODE_SUCCESS) {
     return code;
   }
@@ -5600,6 +5600,10 @@ SArray* getResultGroupCheckColumns(STaskAttr* pQuery) {
 }
 
 static void destroySortedMergeOperatorInfo(void* param, int32_t numOfOutput) {
+  SSortedMergeOperatorInfo* pInfo = (SSortedMergeOperatorInfo*) param;
+  taosArrayDestroy(pInfo->orderInfo);
+  destroySortHandle(pInfo->pSortHandle);
+  blockDataDestroy(pInfo->pDataBlock);
 }
 
 static void destroySlimitOperatorInfo(void* param, int32_t numOfOutput) {
@@ -5655,7 +5659,10 @@ static SSDataBlock* getSortedBlockData(SSortHandle* pHandle, SSDataBlock* pDataB
 }
 
 SSDataBlock* loadNextDataBlock(void* param) {
+  SOperatorInfo* pOperator = (SOperatorInfo*) param;
+  bool newgroup = false;
 
+  return pOperator->exec(pOperator, &newgroup);
 }
 
 static SSDataBlock* doSortedMerge(void* param, bool* newgroup) {
@@ -5672,14 +5679,17 @@ static SSDataBlock* doSortedMerge(void* param, bool* newgroup) {
 
   SSchema* p = blockDataExtractSchema(pInfo->pDataBlock, NULL);
   int32_t numOfBufPage = pInfo->sortBufSize / pInfo->bufPageSize;
-  pInfo->pSortHandle = createSortHandle(pInfo->orderInfo, pInfo->nullFirst, SORT_SINGLESOURCE, pInfo->bufPageSize,
+  pInfo->pSortHandle = createSortHandle(pInfo->orderInfo, pInfo->nullFirst, SORT_MULTIWAY_MERGE, pInfo->bufPageSize,
                                         numOfBufPage, p, pInfo->pDataBlock->info.numOfCols, "GET_TASKID(pTaskInfo)");
 
   tfree(p);
   setFetchRawDataFp(pInfo->pSortHandle, loadNextDataBlock);
 
   for(int32_t i = 0; i < pOperator->numOfDownstream; ++i) {
-    sortAddSource(pInfo->pSortHandle, pOperator->pDownstream[i]);
+    SOperatorSource* ps = calloc(1, sizeof(SOperatorSource));
+    ps->param = pOperator->pDownstream[i];
+
+    sortAddSource(pInfo->pSortHandle, ps);
   }
 
   int32_t code = sortOpen(pInfo->pSortHandle);
@@ -5714,7 +5724,7 @@ static SArray* createBlockOrder(SArray* pExprInfo, SArray* pOrderVal) {
   return pOrderInfo;
 }
 
-SOperatorInfo* createSortedMergeOperatorInfo(SOperatorInfo** downstream, int32_t numOfDownstream, SArray* pExprInfo, void* param, SArray* pOrderVal, SExecTaskInfo* pTaskInfo) {
+SOperatorInfo* createSortedMergeOperatorInfo(SOperatorInfo** downstream, int32_t numOfDownstream, SArray* pExprInfo, SArray* pOrderVal, SExecTaskInfo* pTaskInfo) {
   SSortedMergeOperatorInfo* pInfo = calloc(1, sizeof(SSortedMergeOperatorInfo));
   SOperatorInfo* pOperator = calloc(1, sizeof(SOperatorInfo));
   if (pInfo == NULL || pOperator == NULL) {
diff --git a/source/libs/executor/src/tsort.c b/source/libs/executor/src/tsort.c
index 1d42f1f838..196e22d92d 100644
--- a/source/libs/executor/src/tsort.c
+++ b/source/libs/executor/src/tsort.c
@@ -39,7 +39,7 @@ typedef struct SSortHandle {
   bool              nullFirst;
   bool              hasVarCol;
 
-  SArray           *pSources;
+  SArray           *pSources;  // TODO refactor, remove it
   SArray           *pOrderedSource;
 
   _sort_fetch_block_fn_t  fetchfp;
@@ -119,6 +119,7 @@ void destroySortHandle(SSortHandle* pSortHandle) {
     tMergeTreeDestroy(pSortHandle->pMergeTree);
   }
 
+  destroyDiskbasedBuf(pSortHandle->pBuf);
   tfree(pSortHandle->idStr);
   tfree(pSortHandle);
 }
@@ -171,7 +172,7 @@ static int32_t doAddToBuf(SSDataBlock* pDataBlock, SSortHandle* pHandle) {
   int32_t start = 0;
 
   if (pHandle->pBuf == NULL) {
-    int32_t code = createDiskbasedBuffer(&pHandle->pBuf, pHandle->pageSize, pHandle->numOfPages * pHandle->pageSize, 0, "/tmp");
+    int32_t code = createDiskbasedBuf(&pHandle->pBuf, pHandle->pageSize, pHandle->numOfPages * pHandle->pageSize, 0, "/tmp");
     setPrintStatis(pHandle->pBuf);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
@@ -235,7 +236,7 @@ static int32_t sortComparInit(SMsortComparParam* cmpParam, SArray* pSources, int
   } else {
     // multi-pass internal merge sort is required
     if (pHandle->pBuf == NULL) {
-      code = createDiskbasedBuffer(&pHandle->pBuf, pHandle->pageSize, pHandle->numOfPages * pHandle->pageSize, 0, "/tmp");
+      code = createDiskbasedBuf(&pHandle->pBuf, pHandle->pageSize, pHandle->numOfPages * pHandle->pageSize, 0, "/tmp");
       setPrintStatis(pHandle->pBuf);
       if (code != TSDB_CODE_SUCCESS) {
         return code;
@@ -614,7 +615,10 @@ int32_t sortOpen(SSortHandle* pHandle) {
   }
 
   int32_t numOfSources = taosArrayGetSize(pHandle->pOrderedSource);
-  ASSERT(numOfSources <= getNumOfInMemBufPages(pHandle->pBuf));
+  if (pHandle->pBuf != NULL) {
+    ASSERT(numOfSources <= getNumOfInMemBufPages(pHandle->pBuf));
+  }
+
   code = sortComparInit(&pHandle->cmpParam, pHandle->pOrderedSource, 0, numOfSources - 1, pHandle);
   if (code != TSDB_CODE_SUCCESS) {
     return code;
diff --git a/source/libs/executor/test/executorTests.cpp b/source/libs/executor/test/executorTests.cpp
index 160bf1f7ca..2651b95b0f 100644
--- a/source/libs/executor/test/executorTests.cpp
+++ b/source/libs/executor/test/executorTests.cpp
@@ -35,10 +35,17 @@
 
 namespace {
 
+enum {
+  data_rand = 0x1,
+  data_asc  = 0x2,
+  data_desc = 0x3,
+};
+
 typedef struct SDummyInputInfo {
   int32_t max;
   int32_t current;
   int32_t startVal;
+  int32_t type;
   SSDataBlock* pBlock;
 } SDummyInputInfo;
 
@@ -83,10 +90,18 @@ SSDataBlock* getDummyBlock(void* param, bool* newgroup) {
 
   char buf[128] = {0};
   char b1[128] = {0};
+  int32_t v = 0;
   for(int32_t i = 0; i < numOfRows; ++i) {
     SColumnInfoData* pColInfo = static_cast<SColumnInfoData*>(TARRAY_GET_ELEM(pBlock->pDataBlock, 0));
 
-    int32_t v = (--pInfo->startVal);
+    if (pInfo->type == data_desc) {
+      v = (--pInfo->startVal);
+    } else if (pInfo->type == data_asc) {
+      v = ++pInfo->startVal;
+    } else if (pInfo->type == data_rand) {
+      v = random();
+    }
+
     colDataAppend(pColInfo, i, reinterpret_cast<const char*>(&v), false);
 
 //    sprintf(buf, "this is %d row", i);
@@ -103,7 +118,7 @@ SSDataBlock* getDummyBlock(void* param, bool* newgroup) {
   return pBlock;
 }
 
-SOperatorInfo* createDummyOperator(int32_t numOfBlocks) {
+SOperatorInfo* createDummyOperator(int32_t numOfBlocks, int32_t type) {
   SOperatorInfo* pOperator = static_cast<SOperatorInfo*>(calloc(1, sizeof(SOperatorInfo)));
   pOperator->name = "dummyInputOpertor4Test";
   pOperator->exec = getDummyBlock;
@@ -111,6 +126,7 @@ SOperatorInfo* createDummyOperator(int32_t numOfBlocks) {
   SDummyInputInfo *pInfo = (SDummyInputInfo*) calloc(1, sizeof(SDummyInputInfo));
   pInfo->max = numOfBlocks;
   pInfo->startVal = 1500000;
+  pInfo->type = type;
 
   pOperator->info = pInfo;
   return pOperator;
@@ -121,6 +137,7 @@ int main(int argc, char** argv) {
   return RUN_ALL_TESTS();
 }
 
+#if 0
 TEST(testCase, build_executor_tree_Test) {
   const char* msg = "{\n"
                     "\t\"Id\":\t{\n"
@@ -216,34 +233,34 @@ TEST(testCase, build_executor_tree_Test) {
 //  int32_t code = qCreateExecTask(&handle, 2, 1, NULL, (void**) &pTaskInfo, &sinkHandle);
 }
 
-//TEST(testCase, inMem_sort_Test) {
-//  SArray* pOrderVal = taosArrayInit(4, sizeof(SOrder));
-//  SOrder o = {.order = TSDB_ORDER_ASC};
-//  o.col.info.colId = 1;
-//  o.col.info.type = TSDB_DATA_TYPE_INT;
-//  taosArrayPush(pOrderVal, &o);
-//
-//  SArray* pExprInfo = taosArrayInit(4, sizeof(SExprInfo));
-//  SExprInfo *exp = static_cast<SExprInfo*>(calloc(1, sizeof(SExprInfo)));
-//  exp->base.resSchema = createSchema(TSDB_DATA_TYPE_INT, sizeof(int32_t), 1, "res");
-//  taosArrayPush(pExprInfo, &exp);
-//
-//  SExprInfo *exp1 = static_cast<SExprInfo*>(calloc(1, sizeof(SExprInfo)));
-//  exp1->base.resSchema = createSchema(TSDB_DATA_TYPE_BINARY, 40, 2, "res1");
-//  taosArrayPush(pExprInfo, &exp1);
-//
-//  SOperatorInfo* pOperator = createOrderOperatorInfo(createDummyOperator(5), pExprInfo, pOrderVal);
-//
-//  bool newgroup = false;
-//  SSDataBlock* pRes = pOperator->exec(pOperator, &newgroup);
-//
-//  SColumnInfoData* pCol1 = static_cast<SColumnInfoData*>(taosArrayGet(pRes->pDataBlock, 0));
-//  SColumnInfoData* pCol2 = static_cast<SColumnInfoData*>(taosArrayGet(pRes->pDataBlock, 1));
-//  for(int32_t i = 0; i < pRes->info.rows; ++i) {
-//    char* p = colDataGet(pCol2, i);
-//    printf("%d: %d, %s\n", i, ((int32_t*)pCol1->pData)[i], (char*)varDataVal(p));
-//  }
-//}
+TEST(testCase, inMem_sort_Test) {
+  SArray* pOrderVal = taosArrayInit(4, sizeof(SOrder));
+  SOrder o = {.order = TSDB_ORDER_ASC};
+  o.col.info.colId = 1;
+  o.col.info.type = TSDB_DATA_TYPE_INT;
+  taosArrayPush(pOrderVal, &o);
+
+  SArray* pExprInfo = taosArrayInit(4, sizeof(SExprInfo));
+  SExprInfo *exp = static_cast<SExprInfo*>(calloc(1, sizeof(SExprInfo)));
+  exp->base.resSchema = createSchema(TSDB_DATA_TYPE_INT, sizeof(int32_t), 1, "res");
+  taosArrayPush(pExprInfo, &exp);
+
+  SExprInfo *exp1 = static_cast<SExprInfo*>(calloc(1, sizeof(SExprInfo)));
+  exp1->base.resSchema = createSchema(TSDB_DATA_TYPE_BINARY, 40, 2, "res1");
+  taosArrayPush(pExprInfo, &exp1);
+
+  SOperatorInfo* pOperator = createOrderOperatorInfo(createDummyOperator(5), pExprInfo, pOrderVal, NULL);
+
+  bool newgroup = false;
+  SSDataBlock* pRes = pOperator->exec(pOperator, &newgroup);
+
+  SColumnInfoData* pCol1 = static_cast<SColumnInfoData*>(taosArrayGet(pRes->pDataBlock, 0));
+  SColumnInfoData* pCol2 = static_cast<SColumnInfoData*>(taosArrayGet(pRes->pDataBlock, 1));
+  for(int32_t i = 0; i < pRes->info.rows; ++i) {
+    char* p = colDataGet(pCol2, i);
+    printf("%d: %d, %s\n", i, ((int32_t*)pCol1->pData)[i], (char*)varDataVal(p));
+  }
+}
 
 typedef struct su {
   int32_t v;
@@ -339,6 +356,7 @@ TEST(testCase, external_sort_Test) {
   taosArrayDestroy(pExprInfo);
   taosArrayDestroy(pOrderVal);
 }
+#endif
 
 TEST(testCase, sorted_merge_Test) {
   srand(time(NULL));
@@ -359,7 +377,13 @@ TEST(testCase, sorted_merge_Test) {
   exp1->base.resSchema = createSchema(TSDB_DATA_TYPE_BINARY, 40, 2, "res1");
 //  taosArrayPush(pExprInfo, &exp1);
 
-  SOperatorInfo* pOperator = createOrderOperatorInfo(createDummyOperator(1500), pExprInfo, pOrderVal, NULL);
+  int32_t numOfSources = 10;
+  SOperatorInfo** plist = (SOperatorInfo**) calloc(numOfSources, sizeof(void*));
+  for(int32_t i = 0; i < numOfSources; ++i) {
+    plist[i] = createDummyOperator(1, data_asc);
+  }
+
+  SOperatorInfo* pOperator = createSortedMergeOperatorInfo(plist, numOfSources, pExprInfo, pOrderVal, NULL);
 
   bool newgroup = false;
   SSDataBlock* pRes = NULL;
diff --git a/source/libs/executor/test/executorUtilTests.cpp b/source/libs/executor/test/executorUtilTests.cpp
index 57691d6d11..5c94b89c3d 100644
--- a/source/libs/executor/test/executorUtilTests.cpp
+++ b/source/libs/executor/test/executorUtilTests.cpp
@@ -219,50 +219,50 @@ int32_t docomp(const void* p1, const void* p2, void* param) {
 //  destroySortHandle(phandle);
 //}
 
-TEST(testCase, ordered_merge_sort_Test) {
-  SArray* pOrderVal = taosArrayInit(4, sizeof(SOrder));
-  SOrder o = {.order = TSDB_ORDER_ASC};
-  o.col.info.colId = 1;
-  o.col.info.type = TSDB_DATA_TYPE_INT;
-  taosArrayPush(pOrderVal, &o);
-
-  int32_t numOfRows = 1000;
-  SBlockOrderInfo oi = {0};
-  oi.order = TSDB_ORDER_ASC;
-  oi.colIndex = 0;
-  SArray* orderInfo = taosArrayInit(1, sizeof(SBlockOrderInfo));
-  taosArrayPush(orderInfo, &oi);
-
-  SSchema s = {.type = TSDB_DATA_TYPE_INT, .colId = 1, .bytes = 4};
-  SSortHandle* phandle = createSortHandle(orderInfo, false, SORT_MULTIWAY_MERGE, 1024, 5, &s, 1,"test_abc");
-  setFetchRawDataFp(phandle, getSingleColDummyBlock);
-  setComparFn(phandle, docomp);
-
-  for(int32_t i = 0; i < 10; ++i) {
-    SOperatorSource* p = static_cast<SOperatorSource*>(calloc(1, sizeof(SOperatorSource)));
-    _info* c = static_cast<_info*>(calloc(1, sizeof(_info)));
-    c->count    = 1;
-    c->pageRows = 1000;
-    c->startVal = 0;
-
-    p->param = c;
-    sortAddSource(phandle, p);
-  }
-
-  int32_t code = sortOpen(phandle);
-  int32_t row = 1;
-
-  while(1) {
-    STupleHandle* pTupleHandle = sortNextTuple(phandle);
-    if (pTupleHandle == NULL) {
-      break;
-    }
-
-    void* v = sortGetValue(pTupleHandle, 0);
-    printf("%d: %d\n", row++, *(int32_t*) v);
-
-  }
-  destroySortHandle(phandle);
-}
+//TEST(testCase, ordered_merge_sort_Test) {
+//  SArray* pOrderVal = taosArrayInit(4, sizeof(SOrder));
+//  SOrder o = {.order = TSDB_ORDER_ASC};
+//  o.col.info.colId = 1;
+//  o.col.info.type = TSDB_DATA_TYPE_INT;
+//  taosArrayPush(pOrderVal, &o);
+//
+//  int32_t numOfRows = 1000;
+//  SBlockOrderInfo oi = {0};
+//  oi.order = TSDB_ORDER_ASC;
+//  oi.colIndex = 0;
+//  SArray* orderInfo = taosArrayInit(1, sizeof(SBlockOrderInfo));
+//  taosArrayPush(orderInfo, &oi);
+//
+//  SSchema s = {.type = TSDB_DATA_TYPE_INT, .colId = 1, .bytes = 4};
+//  SSortHandle* phandle = createSortHandle(orderInfo, false, SORT_MULTIWAY_MERGE, 1024, 5, &s, 1,"test_abc");
+//  setFetchRawDataFp(phandle, getSingleColDummyBlock);
+//  setComparFn(phandle, docomp);
+//
+//  for(int32_t i = 0; i < 10; ++i) {
+//    SOperatorSource* p = static_cast<SOperatorSource*>(calloc(1, sizeof(SOperatorSource)));
+//    _info* c = static_cast<_info*>(calloc(1, sizeof(_info)));
+//    c->count    = 1;
+//    c->pageRows = 1000;
+//    c->startVal = 0;
+//
+//    p->param = c;
+//    sortAddSource(phandle, p);
+//  }
+//
+//  int32_t code = sortOpen(phandle);
+//  int32_t row = 1;
+//
+//  while(1) {
+//    STupleHandle* pTupleHandle = sortNextTuple(phandle);
+//    if (pTupleHandle == NULL) {
+//      break;
+//    }
+//
+//    void* v = sortGetValue(pTupleHandle, 0);
+//    printf("%d: %d\n", row++, *(int32_t*) v);
+//
+//  }
+//  destroySortHandle(phandle);
+//}
 
 #pragma GCC diagnostic pop
diff --git a/source/libs/function/src/tpercentile.c b/source/libs/function/src/tpercentile.c
index 40731adc58..c6ab125362 100644
--- a/source/libs/function/src/tpercentile.c
+++ b/source/libs/function/src/tpercentile.c
@@ -254,7 +254,7 @@ tMemBucket *tMemBucketCreate(int16_t nElemSize, int16_t dataType, double minval,
 
   resetSlotInfo(pBucket);
 
-  int32_t ret = createDiskbasedBuffer(&pBucket->pBuffer, pBucket->bufPageSize, pBucket->bufPageSize * 512, 1, tsTempDir);
+  int32_t ret = createDiskbasedBuf(&pBucket->pBuffer, pBucket->bufPageSize, pBucket->bufPageSize * 512, 1, tsTempDir);
   if (ret != 0) {
     tMemBucketDestroy(pBucket);
     return NULL;
@@ -269,7 +269,7 @@ void tMemBucketDestroy(tMemBucket *pBucket) {
     return;
   }
 
-  destroyResultBuf(pBucket->pBuffer);
+  destroyDiskbasedBuf(pBucket->pBuffer);
   tfree(pBucket->pSlots);
   tfree(pBucket);
 }
diff --git a/source/util/src/tpagedbuf.c b/source/util/src/tpagedbuf.c
index d5415c219f..f014d8e07e 100644
--- a/source/util/src/tpagedbuf.c
+++ b/source/util/src/tpagedbuf.c
@@ -53,7 +53,7 @@ typedef struct SDiskbasedBuf {
 
 static void printStatisData(const SDiskbasedBuf* pBuf);
 
-int32_t createDiskbasedBuffer(SDiskbasedBuf** pBuf, int32_t pagesize, int32_t inMemBufSize, uint64_t qId, const char* dir) {
+int32_t createDiskbasedBuf(SDiskbasedBuf** pBuf, int32_t pagesize, int32_t inMemBufSize, uint64_t qId, const char* dir) {
   *pBuf = calloc(1, sizeof(SDiskbasedBuf));
 
   SDiskbasedBuf* pResBuf = *pBuf;
@@ -473,7 +473,7 @@ void releaseBufPageInfo(SDiskbasedBuf* pBuf, SPageInfo* pi) {
   pBuf->statis.releasePages += 1;
 }
 
-size_t getNumOfResultBufGroupId(const SDiskbasedBuf* pBuf) { return taosHashGetSize(pBuf->groupSet); }
+size_t getNumOfBufGroupId(const SDiskbasedBuf* pBuf) { return taosHashGetSize(pBuf->groupSet); }
 
 size_t getTotalBufSize(const SDiskbasedBuf* pBuf) { return (size_t)pBuf->totalBufSize; }
 
@@ -488,7 +488,7 @@ SIDList getDataBufPagesIdList(SDiskbasedBuf* pBuf, int32_t groupId) {
   }
 }
 
-void destroyResultBuf(SDiskbasedBuf* pBuf) {
+void destroyDiskbasedBuf(SDiskbasedBuf* pBuf) {
   if (pBuf == NULL) {
     return;
   }
diff --git a/source/util/test/pageBufferTest.cpp b/source/util/test/pageBufferTest.cpp
index 8fa8216223..d310ff450b 100644
--- a/source/util/test/pageBufferTest.cpp
+++ b/source/util/test/pageBufferTest.cpp
@@ -13,7 +13,7 @@ namespace {
 // simple test
 void simpleTest() {
   SDiskbasedBuf* pResultBuf = NULL;
-  int32_t ret = createDiskbasedBuffer(&pResultBuf, 1024, 4096, 1, "/tmp/");
+  int32_t ret = createDiskbasedBuf(&pResultBuf, 1024, 4096, 1, "/tmp/");
   
   int32_t pageId = 0;
   int32_t groupId = 0;
@@ -25,7 +25,7 @@ void simpleTest() {
   
   SIDList list = getDataBufPagesIdList(pResultBuf, groupId);
   ASSERT_EQ(taosArrayGetSize(list), 1);
-  ASSERT_EQ(getNumOfResultBufGroupId(pResultBuf), 1);
+  ASSERT_EQ(getNumOfBufGroupId(pResultBuf), 1);
 
   releaseBufPage(pResultBuf, pBufPage);
 
@@ -50,12 +50,12 @@ void simpleTest() {
   SFilePage* t4 = getBufPage(pResultBuf, pageId);
   ASSERT_TRUE(t4 == pBufPage5);
 
-  destroyResultBuf(pResultBuf);
+  destroyDiskbasedBuf(pResultBuf);
 }
 
 void writeDownTest() {
   SDiskbasedBuf* pResultBuf = NULL;
-  int32_t ret = createDiskbasedBuffer(&pResultBuf, 1024, 4*1024, 1, "/tmp/");
+  int32_t ret = createDiskbasedBuf(&pResultBuf, 1024, 4*1024, 1, "/tmp/");
 
   int32_t pageId = 0;
   int32_t writePageId = 0;
@@ -97,12 +97,12 @@ void writeDownTest() {
   SArray* pa = getDataBufPagesIdList(pResultBuf, groupId);
   ASSERT_EQ(taosArrayGetSize(pa), 5);
 
-  destroyResultBuf(pResultBuf);
+  destroyDiskbasedBuf(pResultBuf);
 }
 
 void recyclePageTest() {
   SDiskbasedBuf* pResultBuf = NULL;
-  int32_t ret = createDiskbasedBuffer(&pResultBuf, 1024, 4*1024, 1, "/tmp/");
+  int32_t ret = createDiskbasedBuf(&pResultBuf, 1024, 4*1024, 1, "/tmp/");
 
   int32_t pageId = 0;
   int32_t writePageId = 0;
@@ -150,7 +150,7 @@ void recyclePageTest() {
   SArray* pa = getDataBufPagesIdList(pResultBuf, groupId);
   ASSERT_EQ(taosArrayGetSize(pa), 6);
 
-  destroyResultBuf(pResultBuf);
+  destroyDiskbasedBuf(pResultBuf);
 }
 } // namespace