diff --git a/source/client/test/clientTests.cpp b/source/client/test/clientTests.cpp
index b8e4dcbea0..69cca1441a 100644
--- a/source/client/test/clientTests.cpp
+++ b/source/client/test/clientTests.cpp
@@ -750,7 +750,7 @@ TEST(testCase, projection_query_stables) {
   taos_close(pConn);
 }
 
-
+#endif
 TEST(testCase, agg_query_tables) {
   TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   ASSERT_NE(pConn, nullptr);
@@ -763,7 +763,7 @@ TEST(testCase, agg_query_tables) {
   }
   taos_free_result(pRes);
 
-  pRes = taos_query(pConn, "show table distributed st1");
+  pRes = taos_query(pConn, "show table distributed tup");
   if (taos_errno(pRes) != 0) {
     printf("failed to select from table, reason:%s\n", taos_errstr(pRes));
     taos_free_result(pRes);
@@ -775,6 +775,7 @@ TEST(testCase, agg_query_tables) {
   taos_close(pConn);
 }
 
+#if 0
 /*
 --- copy the following script in the shell to setup the environment ---
 
@@ -820,7 +821,7 @@ TEST(testCase, async_api_test) {
   getchar();
   taos_close(pConn);
 }
-#endif
+
 
 TEST(testCase, update_test) {
   TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
@@ -857,5 +858,5 @@ TEST(testCase, update_test) {
     taos_free_result(pRes);
   }
 }
-
+#endif
 #pragma GCC diagnostic pop
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index b7429a5b89..a1ac165797 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -55,7 +55,7 @@ typedef struct SIOCostSummary {
 } SIOCostSummary;
 
 typedef struct SBlockLoadSuppInfo {
-  SColumnDataAgg*  pstatis;
+  SColumnDataAgg   tsColAgg;
   SColumnDataAgg** plist;
   int16_t*         colIds;    // column ids for loading file block data
   int32_t*         slotIds;   // colId to slotId
@@ -364,13 +364,14 @@ static int32_t tsdbReaderCreate(SVnode* pVnode, SQueryTableDataCond* pCond, STsd
 
   // allocate buffer in order to load data blocks from file
   SBlockLoadSuppInfo* pSup = &pReader->suppInfo;
-  pSup->pstatis = taosMemoryCalloc(pCond->numOfCols, sizeof(SColumnDataAgg));
   pSup->plist = taosMemoryCalloc(pCond->numOfCols, POINTER_BYTES);
-  if (pSup->pstatis == NULL || pSup->plist == NULL) {
+  if (pSup->plist == NULL) {
     code = TSDB_CODE_OUT_OF_MEMORY;
     goto _end;
   }
 
+  pSup->tsColAgg.colId = PRIMARYKEY_TIMESTAMP_COL_ID;
+
   pReader->pResBlock = createResBlock(pCond, pReader->capacity);
   if (pReader->pResBlock == NULL) {
     code = terrno;
@@ -2647,8 +2648,6 @@ void tsdbReaderClose(STsdbReader* pReader) {
   }
 
   blockDataDestroy(pReader->pResBlock);
-
-  taosMemoryFreeClear(pReader->suppInfo.pstatis);
   taosMemoryFreeClear(pReader->suppInfo.plist);
   taosMemoryFree(pReader->suppInfo.slotIds);
 
@@ -2744,56 +2743,48 @@ int32_t tsdbRetrieveDataBlockStatisInfo(STsdbReader* pReader, SColumnDataAgg***
 
   int64_t stime = taosGetTimestampUs();
 
+  SArray* pColAgg = taosArrayInit(4, sizeof(SColumnDataAgg));
   if (tBlockHasSma(pBlock)) {
-    SArray* pColAgg = taosArrayInit(4, sizeof(SColumnDataAgg));
     code = tsdbReadBlockSma(pReader->pFileReader, pBlock, pColAgg, NULL);
     if (code != TSDB_CODE_SUCCESS) {
       tsdbDebug("vgId:%d, failed to load block SMA for uid %" PRIu64", code:%s, %s", 0, pFBlock->uid,
                 tstrerror(code), pReader->idStr);
       return code;
     }
+  } else {
+    *pBlockStatis = NULL;
+    return TSDB_CODE_SUCCESS;
   }
 
-  int64_t el = taosGetTimestampUs() - stime;
-  tsdbDebug("vgId:%d, succeed to load block SMA for uid %" PRIu64", elapsed time:%"PRId64"us, %s", 0, pFBlock->uid,
-      el, pReader->idStr);
-
-  // int16_t* colIds = pReader->suppInfo.defaultLoadColumn->pData;
-
-  // size_t numOfCols = QH_GET_NUM_OF_COLS(pReader);
-  // memset(pReader->suppInfo.plist, 0, numOfCols * POINTER_BYTES);
-  // memset(pReader->suppInfo.pstatis, 0, numOfCols * sizeof(SColumnDataAgg));
-
-  // for (int32_t i = 0; i < numOfCols; ++i) {
-  //   pReader->suppInfo.pstatis[i].colId = colIds[i];
-  // }
-
-  // *allHave = true;
-  // tsdbGetBlockStatis(&pReader->rhelper, pReader->suppInfo.pstatis, (int)numOfCols, pBlockInfo->compBlock);
+   *allHave = true;
 
    // always load the first primary timestamp column data
-   SColumnDataAgg* pTsAgg = &pReader->suppInfo.pstatis[0];
-   assert(pTsAgg->colId == PRIMARYKEY_TIMESTAMP_COL_ID);
+   SColumnDataAgg* pTsAgg = &pReader->suppInfo.tsColAgg;
 
-   pTsAgg->numOfNull = 0;
+  pTsAgg->numOfNull = 0;
+  pTsAgg->colId = PRIMARYKEY_TIMESTAMP_COL_ID;
    pTsAgg->min = pReader->pResBlock->info.window.skey;
    pTsAgg->max = pReader->pResBlock->info.window.ekey;
-   pReader->suppInfo.plist[0] = &pReader->suppInfo.pstatis[0];
+   pReader->suppInfo.plist[0] = pTsAgg;
 
    // update the number of NULL data rows
    size_t numOfCols = blockDataGetNumOfCols(pReader->pResBlock);
-   int32_t* slotIds = pReader->suppInfo.slotIds;
 
-   for (int32_t i = 1; i < numOfCols; ++i) {
-//     ASSERT(colIds[i] == pReader->pSchema->columns[slotIds[i]].colId);
-     if (IS_BSMA_ON(&(pReader->pSchema->columns[slotIds[i]]))) {
-       if (pReader->suppInfo.pstatis[i].numOfNull == -1) {  // set the column data are all NULL
-//         pReader->suppInfo.pstatis[i].numOfNull = pBlockInfo->compBlock->numOfRows;
+   int32_t i = 0, j = 0;
+   while(j < numOfCols && i < taosArrayGetSize(pColAgg)) {
+     SColumnDataAgg* pAgg = taosArrayGet(pColAgg, i);
+     if (pAgg->colId == pReader->suppInfo.colIds[j]) {
+       if (IS_BSMA_ON(&(pReader->pSchema->columns[i]))) {
+         pReader->suppInfo.plist[j] = pAgg;
+         i += 1;
+         j += 1;
+       } else {
+         *allHave = false;
        }
-
-       pReader->suppInfo.plist[i] = &pReader->suppInfo.pstatis[i];
-     } else {
-       *allHave = false;
+     } else if (pAgg->colId < pReader->suppInfo.colIds[j]) {
+       i += 1;
+     } else if (pReader->suppInfo.colIds[j] < pAgg->colId) {
+       j += 1;
      }
    }
 
@@ -2801,6 +2792,10 @@ int32_t tsdbRetrieveDataBlockStatisInfo(STsdbReader* pReader, SColumnDataAgg***
    pReader->cost.smaLoadTime += elapsed;
 
    *pBlockStatis = pReader->suppInfo.plist;
+
+  tsdbDebug("vgId:%d, succeed to load block SMA for uid %" PRIu64", elapsed time:%"PRId64"us, %s", 0, pFBlock->uid,
+            elapsed, pReader->idStr);
+
   return code;
 }
 
@@ -2843,7 +2838,7 @@ int32_t tsdbReaderReset(STsdbReader* pReader, SQueryTableDataCond* pCond, int32_
   pReader->window = updateQueryTimeWindow(pReader->pTsdb, &pCond->twindows[tWinIdx]);
 
   // allocate buffer in order to load data blocks from file
-  memset(pReader->suppInfo.pstatis, 0, sizeof(SColumnDataAgg));
+  memset(&pReader->suppInfo.tsColAgg, 0, sizeof(SColumnDataAgg));
   memset(pReader->suppInfo.plist, 0, POINTER_BYTES);
 
   // todo set the correct numOfTables
@@ -2899,9 +2894,9 @@ int32_t tsdbGetFileBlocksDistInfo(STsdbReader* pReader, STableBlockDistInfo* pTa
   pTableBlockInfo->numOfBlocks += pBlockIter->numOfBlocks;
 
   pTableBlockInfo->numOfTables = numOfTables;
+  bool hasNext = true;
 
   while (true) {
-    bool hasNext = blockIteratorNext(&pStatus->blockIter);
     if (hasNext) {
       SFileDataBlockInfo*  pFBlock = getCurrentBlockInfo(pBlockIter);
       STableBlockScanInfo* pScanInfo = taosHashGet(pStatus->pTableMap, &pFBlock->uid, sizeof(pFBlock->uid));
@@ -2924,6 +2919,9 @@ int32_t tsdbGetFileBlocksDistInfo(STsdbReader* pReader, STableBlockDistInfo* pTa
 
       int32_t bucketIndex = getBucketIndex(pTableBlockInfo->defMinRows, bucketRange, numOfRows);
       pTableBlockInfo->blockRowsHisto[bucketIndex]++;
+
+      hasNext = blockIteratorNext(&pStatus->blockIter);
+
     } else {
       code = initForFirstBlockInFile(pReader, pBlockIter);
       if ((code != TSDB_CODE_SUCCESS) || (pReader->status.loadFromFile == false)) {
@@ -2933,6 +2931,11 @@ int32_t tsdbGetFileBlocksDistInfo(STsdbReader* pReader, STableBlockDistInfo* pTa
       pTableBlockInfo->numOfBlocks += pBlockIter->numOfBlocks;
     }
 
+/*
+    hasNext = blockIteratorNext(&pStatus->blockIter);
+*/
+
+
 //         tsdbDebug("%p %d blocks found in file for %d table(s), fid:%d, %s", pReader, numOfBlocks, numOfTables,
 //                   pReader->pFileGroup->fid, pReader->idStr);
   }
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index f94522f0d8..03532caac0 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -5547,30 +5547,18 @@ int32_t blockDistFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
     }
   }
 
-  int32_t delta = maxVal - minVal;
-  int32_t step = delta / 50;
-  if (step == 0) {
-    step = 1;
-  }
+  // maximum number of step is 80
+  double factor = pData->numOfBlocks / 80.0;
 
   int32_t numOfBuckets = sizeof(pData->blockRowsHisto) / sizeof(pData->blockRowsHisto[0]);
-  int32_t bucketRange = (pData->maxRows - pData->minRows) / numOfBuckets;
-
-  bool singleModel = false;
-  if (bucketRange == 0) {
-    singleModel = true;
-    step = 20;
-    bucketRange = (pData->defMaxRows - pData->defMinRows) / numOfBuckets;
-  }
+  int32_t bucketRange = (pData->defMaxRows - pData->defMinRows) / numOfBuckets;
 
   for (int32_t i = 0; i < tListLen(pData->blockRowsHisto); ++i) {
-    len = sprintf(st + VARSTR_HEADER_SIZE, "%04d |", pData->defMinRows + bucketRange * (i + 1));
+    len = sprintf(st + VARSTR_HEADER_SIZE, "%04d |", pData->defMinRows + bucketRange * i);
 
     int32_t num = 0;
-    if (singleModel && pData->blockRowsHisto[i] > 0) {
-      num = 20;
-    } else {
-      num = (pData->blockRowsHisto[i] + step - 1) / step;
+    if (pData->blockRowsHisto[i] > 0) {
+      num = (pData->blockRowsHisto[i]) / factor;
     }
 
     for (int32_t j = 0; j < num; ++j) {
@@ -5578,9 +5566,10 @@ int32_t blockDistFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
       len += x;
     }
 
-    double v = pData->blockRowsHisto[i] * 100.0 / pData->numOfBlocks;
-    len += sprintf(st + VARSTR_HEADER_SIZE + len, "  %d (%.2f%c)", pData->blockRowsHisto[i], v, '%');
-    printf("%s\n", st);
+    if (num > 0) {
+      double v = pData->blockRowsHisto[i] * 100.0 / pData->numOfBlocks;
+      len += sprintf(st + VARSTR_HEADER_SIZE + len, "  %d (%.2f%c)", pData->blockRowsHisto[i], v, '%');
+    }
 
     varDataSetLen(st, len);
     colDataAppend(pColInfo, row++, st, false);