diff --git a/include/common/tcommon.h b/include/common/tcommon.h
index 61286cd675..39ababea08 100644
--- a/include/common/tcommon.h
+++ b/include/common/tcommon.h
@@ -159,19 +159,25 @@ typedef struct SColumn {
 } SColumn;
 
 typedef struct STableBlockDistInfo {
-  uint16_t rowSize;
+  uint32_t rowSize;
   uint16_t numOfFiles;
   uint32_t numOfTables;
+  uint32_t numOfBlocks;
   uint64_t totalSize;
   uint64_t totalRows;
   int32_t  maxRows;
   int32_t  minRows;
+  int32_t  defMinRows;
+  int32_t  defMaxRows;
   int32_t  firstSeekTimeUs;
-  uint32_t numOfRowsInMemTable;
+  uint32_t numOfInmemRows;
   uint32_t numOfSmallBlocks;
-  SArray*  dataBlockInfos;
+  int32_t  blockRowsHisto[20];
 } STableBlockDistInfo;
 
+int32_t tSerializeBlockDistInfo(void* buf, int32_t bufLen, const STableBlockDistInfo* pInfo);
+int32_t tDeserializeBlockDistInfo(void* buf, int32_t bufLen, STableBlockDistInfo* pInfo);
+
 enum {
   FUNC_PARAM_TYPE_VALUE = 0x1,
   FUNC_PARAM_TYPE_COLUMN = 0x2,
diff --git a/include/libs/function/function.h b/include/libs/function/function.h
index e8cb363e08..9ccf8b7439 100644
--- a/include/libs/function/function.h
+++ b/include/libs/function/function.h
@@ -58,7 +58,6 @@ typedef struct SFileBlockInfo {
   int32_t numBlocksOfStep;
 } SFileBlockInfo;
 
-#define TSDB_BLOCK_DIST_STEP_ROWS 8
 #define MAX_INTERVAL_TIME_WINDOW  1000000  // maximum allowed time windows in final results
 
 #define TOP_BOTTOM_QUERY_LIMIT    100
diff --git a/include/libs/function/functionMgt.h b/include/libs/function/functionMgt.h
index e6512b5bac..945d87a980 100644
--- a/include/libs/function/functionMgt.h
+++ b/include/libs/function/functionMgt.h
@@ -121,6 +121,7 @@ typedef enum EFunctionType {
 
   // internal function
   FUNCTION_TYPE_SELECT_VALUE,
+  FUNCTION_TYPE_BLOCK_DIST,   // block distribution aggregate function
 
   // distributed splitting functions
   FUNCTION_TYPE_APERCENTILE_PARTIAL,
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 146757096f..4a433a557b 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -2557,6 +2557,10 @@ static void moveToNextDataBlockInCurrentFile(STsdbReadHandle* pTsdbReadHandle) {
   cur->blockCompleted = false;
 }
 
+static int32_t getBucketIndex(int32_t startRow, int32_t bucketRange, int32_t numOfRows) {
+  return (numOfRows - startRow) / bucketRange;
+}
+
 int32_t tsdbGetFileBlocksDistInfo(tsdbReaderT* queryHandle, STableBlockDistInfo* pTableBlockInfo) {
   STsdbReadHandle* pTsdbReadHandle = (STsdbReadHandle*)queryHandle;
 
@@ -2575,16 +2579,20 @@ int32_t tsdbGetFileBlocksDistInfo(tsdbReaderT* queryHandle, STableBlockDistInfo*
   tsdbFSIterSeek(&pTsdbReadHandle->fileIter, fid);
   tsdbUnLockFS(pFileHandle);
 
+  STsdbCfg* pc = REPO_CFG(pTsdbReadHandle->pTsdb);
+  pTableBlockInfo->defMinRows = pc->minRows;
+  pTableBlockInfo->defMaxRows = pc->maxRows;
+
+  int32_t bucketRange = ceil((pc->maxRows - pc->minRows) / 20.0);
+
   pTableBlockInfo->numOfFiles += 1;
 
   int32_t     code = TSDB_CODE_SUCCESS;
   int32_t     numOfBlocks = 0;
   int32_t     numOfTables = (int32_t)taosArrayGetSize(pTsdbReadHandle->pTableCheckInfo);
-  int         defaultRows = 4096;  // TSDB_DEFAULT_BLOCK_ROWS(pCfg->maxRowsPerFileBlock);
+  int         defaultRows = 4096;
   STimeWindow win = TSWINDOW_INITIALIZER;
 
-  bool ascTraverse = ASCENDING_TRAVERSE(pTsdbReadHandle->order);
-
   while (true) {
     numOfBlocks = 0;
     tsdbRLockFS(REPO_FS(pTsdbReadHandle->pTsdb));
@@ -2597,8 +2605,7 @@ int32_t tsdbGetFileBlocksDistInfo(tsdbReaderT* queryHandle, STableBlockDistInfo*
     tsdbGetFidKeyRange(pCfg->days, pCfg->precision, pTsdbReadHandle->pFileGroup->fid, &win.skey, &win.ekey);
 
     // current file are not overlapped with query time window, ignore remain files
-    if ((ascTraverse && win.skey > pTsdbReadHandle->window.ekey) ||
-        (!ascTraverse && win.ekey < pTsdbReadHandle->window.ekey)) {
+    if ((win.skey > pTsdbReadHandle->window.ekey)/* || (!ascTraverse && win.ekey < pTsdbReadHandle->window.ekey)*/) {
       tsdbUnLockFS(REPO_FS(pTsdbReadHandle->pTsdb));
       tsdbDebug("%p remain files are not qualified for qrange:%" PRId64 "-%" PRId64 ", ignore, %s", pTsdbReadHandle,
                 pTsdbReadHandle->window.skey, pTsdbReadHandle->window.ekey, pTsdbReadHandle->idStr);
@@ -2631,15 +2638,19 @@ int32_t tsdbGetFileBlocksDistInfo(tsdbReaderT* queryHandle, STableBlockDistInfo*
       continue;
     }
 
+    pTableBlockInfo->numOfBlocks += numOfBlocks;
+
     for (int32_t i = 0; i < numOfTables; ++i) {
       STableCheckInfo* pCheckInfo = taosArrayGet(pTsdbReadHandle->pTableCheckInfo, i);
 
       SBlock* pBlock = pCheckInfo->pCompInfo->blocks;
+
       for (int32_t j = 0; j < pCheckInfo->numOfBlocks; ++j) {
         pTableBlockInfo->totalSize += pBlock[j].len;
 
         int32_t numOfRows = pBlock[j].numOfRows;
         pTableBlockInfo->totalRows += numOfRows;
+
         if (numOfRows > pTableBlockInfo->maxRows) {
           pTableBlockInfo->maxRows = numOfRows;
         }
@@ -2651,13 +2662,14 @@ int32_t tsdbGetFileBlocksDistInfo(tsdbReaderT* queryHandle, STableBlockDistInfo*
         if (numOfRows < defaultRows) {
           pTableBlockInfo->numOfSmallBlocks += 1;
         }
-        //        int32_t  stepIndex = (numOfRows-1)/TSDB_BLOCK_DIST_STEP_ROWS;
-        //        SFileBlockInfo *blockInfo = (SFileBlockInfo*)taosArrayGet(pTableBlockInfo->dataBlockInfos, stepIndex);
-        //        blockInfo->numBlocksOfStep++;
+
+        int32_t bucketIndex = getBucketIndex(pTableBlockInfo->defMinRows, bucketRange, numOfRows);
+        pTableBlockInfo->blockRowsHisto[bucketIndex]++;
       }
     }
   }
 
+  pTableBlockInfo->numOfTables = numOfTables;
   return code;
 }
 
diff --git a/source/libs/executor/src/executil.c b/source/libs/executor/src/executil.c
index 484ff35e3a..7550c744c8 100644
--- a/source/libs/executor/src/executil.c
+++ b/source/libs/executor/src/executil.c
@@ -449,7 +449,7 @@ int32_t mergeIntoGroupResult(SGroupResInfo* pGroupResInfo, STaskRuntimeEnv* pRun
 //  tbufWriteUint64(bw, pDist->totalRows);
 //  tbufWriteInt32(bw, pDist->maxRows);
 //  tbufWriteInt32(bw, pDist->minRows);
-//  tbufWriteUint32(bw, pDist->numOfRowsInMemTable);
+//  tbufWriteUint32(bw, pDist->numOfInmemRows);
 //  tbufWriteUint32(bw, pDist->numOfSmallBlocks);
 //  tbufWriteUint64(bw, taosArrayGetSize(pDist->dataBlockInfos));
 //
@@ -488,7 +488,7 @@ int32_t mergeIntoGroupResult(SGroupResInfo* pGroupResInfo, STaskRuntimeEnv* pRun
 //  pDist->totalRows   = tbufReadUint64(&br);
 //  pDist->maxRows     = tbufReadInt32(&br);
 //  pDist->minRows     = tbufReadInt32(&br);
-//  pDist->numOfRowsInMemTable = tbufReadUint32(&br);
+//  pDist->numOfInmemRows = tbufReadUint32(&br);
 //  pDist->numOfSmallBlocks = tbufReadUint32(&br);
 //  int64_t numSteps = tbufReadUint64(&br);
 //
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index cc76cc29e4..b7768bb746 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -641,29 +641,19 @@ static SSDataBlock* doBlockInfoScan(SOperatorInfo* pOperator) {
 
   STableScanInfo* pTableScanInfo = pOperator->info;
 
-  STableBlockDistInfo tableBlockDist = {0};
-  tableBlockDist.numOfTables = 1;  // TODO set the correct number of tables
+  STableBlockDistInfo blockDistInfo = {0};
+  blockDistInfo.maxRows = INT_MIN;
+  blockDistInfo.minRows = INT_MAX;
 
-  int32_t numRowSteps = TSDB_DEFAULT_MAXROWS_FBLOCK / TSDB_BLOCK_DIST_STEP_ROWS;
-  if (TSDB_DEFAULT_MAXROWS_FBLOCK % TSDB_BLOCK_DIST_STEP_ROWS != 0) {
-    ++numRowSteps;
-  }
-
-  tableBlockDist.dataBlockInfos = taosArrayInit(numRowSteps, sizeof(SFileBlockInfo));
-  taosArraySetSize(tableBlockDist.dataBlockInfos, numRowSteps);
-
-  tableBlockDist.maxRows = INT_MIN;
-  tableBlockDist.minRows = INT_MAX;
-
-  tsdbGetFileBlocksDistInfo(pTableScanInfo->dataReader, &tableBlockDist);
-  tableBlockDist.numOfRowsInMemTable = (int32_t)tsdbGetNumOfRowsInMemTable(pTableScanInfo->dataReader);
+  tsdbGetFileBlocksDistInfo(pTableScanInfo->dataReader, &blockDistInfo);
+  blockDistInfo.numOfInmemRows = (int32_t)tsdbGetNumOfRowsInMemTable(pTableScanInfo->dataReader);
 
   SSDataBlock* pBlock = pTableScanInfo->pResBlock;
   pBlock->info.rows = 1;
   pBlock->info.numOfCols = 1;
 
   //  SBufferWriter bw = tbufInitWriter(NULL, false);
-  //  blockDistInfoToBinary(&tableBlockDist, &bw);
+  //  blockDistInfoToBinary(&blockDistInfo, &bw);
   SColumnInfoData* pColInfo = taosArrayGet(pBlock->pDataBlock, 0);
 
   //  int32_t len = (int32_t) tbufTell(&bw);
@@ -673,9 +663,6 @@ static SSDataBlock* doBlockInfoScan(SOperatorInfo* pOperator) {
   //
   //  tbufCloseWriter(&bw);
 
-  //  SArray* g = GET_TABLEGROUP(pOperator->, 0);
-  //  pOperator->pRuntimeEnv->current = taosArrayGetP(g, 0);
-
   pOperator->status = OP_EXEC_DONE;
   return pBlock;
 }
@@ -688,24 +675,22 @@ SOperatorInfo* createDataBlockInfoScanOperator(void* dataReader, SExecTaskInfo*
     goto _error;
   }
 
-  pInfo->dataReader = dataReader;
+  pInfo->dataReader        = dataReader;
   //  pInfo->block.pDataBlock = taosArrayInit(1, sizeof(SColumnInfoData));
 
   SColumnInfoData infoData = {0};
-  infoData.info.type = TSDB_DATA_TYPE_BINARY;
-  infoData.info.bytes = 1024;
-  infoData.info.colId = 0;
+  infoData.info.type       = TSDB_DATA_TYPE_VARCHAR;
+  infoData.info.bytes      = 1024;
   //  taosArrayPush(pInfo->block.pDataBlock, &infoData);
 
-  pOperator->name = "DataBlockInfoScanOperator";
+  pOperator->name          = "DataBlockInfoScanOperator";
   //  pOperator->operatorType = OP_TableBlockInfoScan;
-  pOperator->blocking = false;
-  pOperator->status = OP_NOT_OPENED;
-  pOperator->fpSet._openFn = operatorDummyOpenFn;
-  pOperator->fpSet.getNextFn = doBlockInfoScan;
-
-  pOperator->info = pInfo;
-  pOperator->pTaskInfo = pTaskInfo;
+  pOperator->blocking      = false;
+  pOperator->status        = OP_NOT_OPENED;
+  pOperator->info          = pInfo;
+  pOperator->pTaskInfo     = pTaskInfo;
+  
+  pOperator->fpSet = createOperatorFpSet(operatorDummyOpenFn, doBlockInfoScan, NULL, NULL, NULL, NULL, NULL, NULL);
 
   return pOperator;
 
diff --git a/source/libs/function/inc/builtinsimpl.h b/source/libs/function/inc/builtinsimpl.h
index 56379f0e1f..b31017228a 100644
--- a/source/libs/function/inc/builtinsimpl.h
+++ b/source/libs/function/inc/builtinsimpl.h
@@ -140,17 +140,14 @@ int32_t mavgFunction(SqlFunctionCtx* pCtx);
 bool getSampleFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);
 bool sampleFunctionSetup(SqlFunctionCtx *pCtx, SResultRowEntryInfo* pResultInfo);
 int32_t sampleFunction(SqlFunctionCtx* pCtx);
-//int32_t sampleFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock);
 
 bool getTailFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);
 bool tailFunctionSetup(SqlFunctionCtx *pCtx, SResultRowEntryInfo* pResultInfo);
 int32_t tailFunction(SqlFunctionCtx* pCtx);
-//int32_t tailFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock);
 
 bool getUniqueFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);
 bool uniqueFunctionSetup(SqlFunctionCtx *pCtx, SResultRowEntryInfo* pResultInfo);
 int32_t uniqueFunction(SqlFunctionCtx *pCtx);
-//int32_t uniqueFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock);
 
 bool getTwaFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);
 bool twaFunctionSetup(SqlFunctionCtx *pCtx, SResultRowEntryInfo* pResultInfo);
@@ -158,6 +155,8 @@ int32_t twaFunction(SqlFunctionCtx *pCtx);
 int32_t twaFinalize(struct SqlFunctionCtx *pCtx, SSDataBlock* pBlock);
 
 bool getSelectivityFuncEnv(SFunctionNode* pFunc, SFuncExecEnv* pEnv);
+int32_t blockDistFunction(SqlFunctionCtx *pCtx);
+int32_t blockDistFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index a7d6fd7371..6cf4a47bb9 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -1137,6 +1137,12 @@ static int32_t translateSelectValue(SFunctionNode* pFunc, char* pErrBuf, int32_t
   return TSDB_CODE_SUCCESS;
 }
 
+static int32_t translateBlockDistFunc(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
+  pFunc->node.resType = (SDataType) {.bytes = 128, .type = TSDB_DATA_TYPE_VARCHAR};
+  return TSDB_CODE_SUCCESS;
+}
+
+
 // clang-format off
 const SBuiltinFuncDefinition funcMgtBuiltins[] = {
   {
@@ -1865,6 +1871,15 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .initFunc     = functionSetup,
     .processFunc  = NULL,
     .finalizeFunc = NULL
+  },
+  {
+    .name = "_block_dist",
+    .type = FUNCTION_TYPE_BLOCK_DIST,
+    .classification = FUNC_MGT_AGG_FUNC,
+    .translateFunc = translateBlockDistFunc,
+    .getEnvFunc   = NULL,
+    .processFunc  = blockDistFunction,
+    .finalizeFunc = blockDistFinalize
   }
 };
 // clang-format on
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 0852779791..dda8a8a890 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -4421,7 +4421,6 @@ int32_t twaFinalize(struct SqlFunctionCtx *pCtx, SSDataBlock* pBlock) {
   if (pResInfo->numOfRes == 0) {
     pResInfo->isNullRes = 1;
   } else {
-    //  assert(pInfo->win.ekey == pInfo->p.key && pInfo->hasResult == pResInfo->hasResult);
     if (pInfo->win.ekey == pInfo->win.skey) {
       pInfo->dOutput = pInfo->p.val;
     } else {
@@ -4434,3 +4433,129 @@ int32_t twaFinalize(struct SqlFunctionCtx *pCtx, SSDataBlock* pBlock) {
   return functionFinalize(pCtx, pBlock);
 }
 
+int32_t blockDistFunction(SqlFunctionCtx *pCtx) {
+  SInputColumnInfoData* pInput = &pCtx->input;
+  SColumnInfoData* pInputCol = pInput->pData[0];
+
+  SResultRowEntryInfo *pResInfo = GET_RES_INFO(pCtx);
+
+  char *pInfo = GET_ROWCELL_INTERBUF(pResInfo);
+  memcpy(pInfo, pInputCol->pData, varDataTLen(pInputCol->pData));
+  pResInfo->numOfRes = 1;
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t tSerializeBlockDistInfo(void* buf, int32_t bufLen, const STableBlockDistInfo* pInfo) {
+  SEncoder encoder = {0};
+  tEncoderInit(&encoder, buf, bufLen);
+
+  if (tStartEncode(&encoder) < 0) return -1;
+  if (tEncodeU32(&encoder, pInfo->rowSize) < 0) return -1;
+
+  if (tEncodeU16(&encoder, pInfo->numOfFiles) < 0) return -1;
+  if (tEncodeU32(&encoder, pInfo->rowSize) < 0) return -1;
+  if (tEncodeU32(&encoder, pInfo->numOfTables) < 0) return -1;
+
+  if (tEncodeU64(&encoder, pInfo->totalSize) < 0) return -1;
+  if (tEncodeU64(&encoder, pInfo->totalRows) < 0) return -1;
+  if (tEncodeI32(&encoder, pInfo->maxRows) < 0) return -1;
+  if (tEncodeI32(&encoder, pInfo->minRows) < 0) return -1;
+  if (tEncodeI32(&encoder, pInfo->defMaxRows) < 0) return -1;
+  if (tEncodeI32(&encoder, pInfo->defMinRows) < 0) return -1;
+  if (tEncodeU32(&encoder, pInfo->numOfInmemRows) < 0) return -1;
+  if (tEncodeU32(&encoder, pInfo->numOfSmallBlocks) < 0) return -1;
+
+  for(int32_t i = 0; i < tListLen(pInfo->blockRowsHisto); ++i) {
+    if (tEncodeI32(&encoder, pInfo->blockRowsHisto[i]) < 0) return -1;
+  }
+
+  tEndEncode(&encoder);
+
+  int32_t tlen = encoder.pos;
+  tEncoderClear(&encoder);
+  return tlen;
+}
+
+int32_t tDeserializeBlockDistInfo(void* buf, int32_t bufLen, STableBlockDistInfo* pInfo) {
+  SDecoder decoder = {0};
+  tDecoderInit(&decoder, buf, bufLen);
+
+  if (tStartDecode(&decoder) < 0) return -1;
+  if (tDecodeU32(&decoder, &pInfo->rowSize) < 0) return -1;
+
+  if (tDecodeU16(&decoder, &pInfo->numOfFiles) < 0) return -1;
+  if (tDecodeU32(&decoder, &pInfo->rowSize) < 0) return -1;
+  if (tDecodeU32(&decoder, &pInfo->numOfTables) < 0) return -1;
+
+  if (tDecodeU64(&decoder, &pInfo->totalSize) < 0) return -1;
+  if (tDecodeU64(&decoder, &pInfo->totalRows) < 0) return -1;
+  if (tDecodeI32(&decoder, &pInfo->maxRows) < 0) return -1;
+  if (tDecodeI32(&decoder, &pInfo->minRows) < 0) return -1;
+  if (tDecodeI32(&decoder, &pInfo->defMaxRows) < 0) return -1;
+  if (tDecodeI32(&decoder, &pInfo->defMinRows) < 0) return -1;
+  if (tDecodeU32(&decoder, &pInfo->numOfInmemRows) < 0) return -1;
+  if (tDecodeU32(&decoder, &pInfo->numOfSmallBlocks) < 0) return -1;
+
+  for(int32_t i = 0; i < tListLen(pInfo->blockRowsHisto); ++i) {
+    if (tDecodeI32(&decoder, &pInfo->blockRowsHisto[i]) < 0) return -1;
+  }
+
+  tDecoderClear(&decoder);
+  return 0;
+}
+
+int32_t blockDistFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
+  SResultRowEntryInfo *pResInfo = GET_RES_INFO(pCtx);
+
+  STableBlockDistInfo info = {0};
+  char *pData = GET_ROWCELL_INTERBUF(pResInfo);
+
+  tDeserializeBlockDistInfo(varDataVal(pData), varDataLen(pData), &info);
+
+  int32_t step = (info.defMaxRows - info.defMinRows) / 50;
+
+  // convert to string results
+  char st[128] = {0};
+  sprintf(st, "Blocks=[%d] Size=[%.3fKb] Average_Block_size=[%.3fKb] Compression_Ratio=[%.3f]", info.numOfBlocks,
+      info.totalSize/1024.0,
+      info.totalSize/(info.numOfBlocks*1024.0),
+      info.totalSize/(info.totalRows*info.rowSize*1.0)
+      );
+
+  sprintf(st, "Total_Rows=[%"PRId64"] MinRows=[%d] MaxRows=[%d] Averge_Rows=[%"PRId64"] Inmem_Rows=[%d]",
+      info.totalRows,
+      info.minRows,
+      info.maxRows,
+      info.totalRows/info.numOfBlocks,
+      info.numOfInmemRows
+      );
+
+  sprintf(st, "Total_Tables=[%d] Total_Files=[%d] Total_Vgroups=[%d]", info.numOfTables, info.numOfFiles, 0);
+  sprintf(st, "----------------------------------------------------------------------");
+
+  int32_t maxVal = 0;
+  int32_t minVal = INT32_MAX;
+  for(int32_t i = 0; i < 100; ++i) {
+    if (maxVal < info.blockRowsHisto[i]) {
+      maxVal = info.blockRowsHisto[i];
+    }
+
+    if (minVal > info.blockRowsHisto[i]) {
+      minVal = info.blockRowsHisto[i];
+    }
+  }
+
+  for(int32_t i = 0; i < 100; ++i) {
+    int32_t len = sprintf(st, "%d |", info.defMinRows + step);
+    int32_t num = (info.blockRowsHisto[i] + step - 1) / step;
+    for(int32_t j = 0; j < num; ++j) {
+      int32_t x = sprintf(st + len, "%c", '|');
+      len += x;
+    }
+
+    double v = info.blockRowsHisto[i]*1.0 / info.numOfBlocks;
+    sprintf(st + len, "  %d (%.3f)\n", info.blockRowsHisto[i], v);
+  }
+
+  return 100;
+}
diff --git a/source/libs/function/src/taggfunction.c b/source/libs/function/src/taggfunction.c
index e683a38cbd..b310b1a8bb 100644
--- a/source/libs/function/src/taggfunction.c
+++ b/source/libs/function/src/taggfunction.c
@@ -3684,7 +3684,7 @@ static void blockDistInfoFromBinary(const char* data, int32_t len, STableBlockDi
   pDist->totalRows   = tbufReadUint64(&br);
   pDist->maxRows     = tbufReadInt32(&br);
   pDist->minRows     = tbufReadInt32(&br);
-  pDist->numOfRowsInMemTable = tbufReadUint32(&br);
+  pDist->numOfInmemRows = tbufReadUint32(&br);
   pDist->numOfSmallBlocks = tbufReadUint32(&br);
   int64_t numSteps = tbufReadUint64(&br);
 
@@ -3732,7 +3732,7 @@ static void mergeTableBlockDist(SResultRowEntryInfo* pResInfo, const STableBlock
   assert(pDist != NULL && pSrc != NULL);
 
   pDist->numOfTables += pSrc->numOfTables;
-  pDist->numOfRowsInMemTable += pSrc->numOfRowsInMemTable;
+  pDist->numOfInmemRows += pSrc->numOfInmemRows;
   pDist->numOfSmallBlocks += pSrc->numOfSmallBlocks;
   pDist->numOfFiles += pSrc->numOfFiles;
   pDist->totalSize += pSrc->totalSize;
@@ -3862,7 +3862,7 @@ void generateBlockDistResult(STableBlockDistInfo *pTableBlockDist, char* result)
                    percentiles[6], percentiles[7], percentiles[8], percentiles[9], percentiles[10], percentiles[11],
                    min, max, avg, stdDev,
                    totalRows, totalBlocks, smallBlocks, totalLen/1024.0, compRatio,
-                   pTableBlockDist->numOfRowsInMemTable);
+                   pTableBlockDist->numOfInmemRows);
   varDataSetLen(result, sz);
   UNUSED(sz);
 }