diff --git a/src/inc/tsdb.h b/src/inc/tsdb.h
index 7fd6d8c10c4b2845be833b00d47d9307652f84ae..d1972bdcead7fe931078c1bbdfd4c3b84841850a 100644
--- a/src/inc/tsdb.h
+++ b/src/inc/tsdb.h
@@ -240,6 +240,7 @@ typedef struct {
   int32_t   minRows;
   int32_t   firstSeekTimeUs;
   uint32_t  numOfRowsInMemTable;
+  uint32_t  numOfSmallBlocks;
   SArray   *dataBlockInfos;
 } STableBlockDist;
 
diff --git a/src/query/src/qAggMain.c b/src/query/src/qAggMain.c
index d96b260b13cf8a1bbcbc9b329a51bc1a714aba8d..c8bf8def03ce0c7c5bc09f7faa77fa8183e068da 100644
--- a/src/query/src/qAggMain.c
+++ b/src/query/src/qAggMain.c
@@ -4108,18 +4108,19 @@ void generateBlockDistResult(STableBlockDist *pTableBlockDist, char* result) {
 
   uint64_t totalLen = pTableBlockDist->totalSize;
   int32_t rowSize = pTableBlockDist->rowSize;
+  int32_t smallBlocks = pTableBlockDist->numOfSmallBlocks;
   double compRatio = (totalRows>0) ? ((double)(totalLen)/(rowSize*totalRows)) : 1;
   int sz = sprintf(result + VARSTR_HEADER_SIZE,
                    "summary: \n\t "
                    "5th=[%d], 10th=[%d], 20th=[%d], 30th=[%d], 40th=[%d], 50th=[%d]\n\t "
                    "60th=[%d], 70th=[%d], 80th=[%d], 90th=[%d], 95th=[%d], 99th=[%d]\n\t "
                    "Min=[%"PRId64"(Rows)] Max=[%"PRId64"(Rows)] Avg=[%"PRId64"(Rows)] Stddev=[%.2f] \n\t "
-                   "Rows=[%"PRIu64"], Blocks=[%"PRId64"], Size=[%.3f(Kb)] Comp=[%.2f]\n\t "
+                   "Rows=[%"PRIu64"], Blocks=[%"PRId64"], SmallBlocks=[%d], Size=[%.3f(Kb)] Comp=[%.2f]\n\t "
                    "RowsInMem=[%d] \n\t",
                    percentiles[0], percentiles[1], percentiles[2], percentiles[3], percentiles[4], percentiles[5],
                    percentiles[6], percentiles[7], percentiles[8], percentiles[9], percentiles[10], percentiles[11],
                    min, max, avg, stdDev,
-                   totalRows, totalBlocks, totalLen/1024.0, compRatio,
+                   totalRows, totalBlocks, smallBlocks, totalLen/1024.0, compRatio,
                    pTableBlockDist->numOfRowsInMemTable);
   varDataSetLen(result, sz);
   UNUSED(sz);
@@ -4157,8 +4158,8 @@ int32_t functionCompatList[] = {
     4,         -1,       -1,         1,        1,      1,          1,           1,        1,     -1,
     //  tag,    colprj,   tagprj,    arithmetic, diff, first_dist, last_dist,   stddev_dst, interp    rate    irate
     1,          1,        1,         1,       -1,      1,          1,           1,          5,        1,      1,
-    // tid_tag, blk_info
-    6,       7
+    // tid_tag, derivative, blk_info
+    6,          8,        7,
 };
 
 SAggFunctionInfo aAggs[] = {{
diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index f5c01d86e7a20384c17aa470435511e985fd8a7a..cb6fb215383f8def2641c2ecb3e43146d1fb8920 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -2423,6 +2423,7 @@ int32_t tsdbGetFileBlocksDistInfo(TsdbQueryHandleT* queryHandle, STableBlockDist
   int32_t     code = TSDB_CODE_SUCCESS;
   int32_t     numOfBlocks = 0;
   int32_t     numOfTables = (int32_t)taosArrayGetSize(pQueryHandle->pTableCheckInfo);
+  int         defaultRows = TSDB_DEFAULT_BLOCK_ROWS(pCfg->maxRowsPerFileBlock);
   STimeWindow win = TSWINDOW_INITIALIZER;
 
   while (true) {
@@ -2482,6 +2483,7 @@ int32_t tsdbGetFileBlocksDistInfo(TsdbQueryHandleT* queryHandle, STableBlockDist
         pTableBlockInfo->totalRows += numOfRows;
         if (numOfRows > pTableBlockInfo->maxRows) pTableBlockInfo->maxRows = numOfRows;
         if (numOfRows < pTableBlockInfo->minRows) pTableBlockInfo->minRows = numOfRows;
+        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++;