diff --git a/src/tsdb/inc/tsdbReadImpl.h b/src/tsdb/inc/tsdbReadImpl.h
index 1775873ca934c36a168e32727b913f4ebafe891a..12727adb89cdf3eebeb014a3b867b412c3a5d9ac 100644
--- a/src/tsdb/inc/tsdbReadImpl.h
+++ b/src/tsdb/inc/tsdbReadImpl.h
@@ -71,12 +71,12 @@ typedef struct {
  * blkVer;     // 0 - original block, 1 - block since importing .smad/.smal
  * aggrOffset; // only valid when blkVer > 0 and aggrStat > 0
  */
-#define SBlockFieldsP1      \
-  uint64_t aggrStat : 1;    \
-  uint64_t blkVer : 7;      \
-  uint64_t aggrOffset : 56; \
-  uint32_t aggrLen;         \
-  uint32_t padding
+#define SBlockFieldsP1         \
+  uint64_t aggrStat : 1;       \
+  uint64_t blkVer : 7;         \
+  uint64_t aggrOffset : 56;    \
+  uint64_t aggrNumOfCols : 16; \
+  uint64_t padding : 48
 
 typedef struct {
   SBlockFieldsP0;
@@ -213,7 +213,6 @@ static FORCE_INLINE size_t tsdbBlockStatisSize(int nCols, uint32_t blkVer) {
   }
 }
 
-#define TSDB_BLOCK_AGGR_COLS(blkLen, blkVer) ((blkLen - sizeof(TSCKSUM)) / sizeof(SAggrBlkColV##blkVer))
 #define TSDB_BLOCK_AGGR_SIZE(ncols, blkVer) (sizeof(SAggrBlkColV##blkVer) * (ncols) + sizeof(TSCKSUM))
 
 static FORCE_INLINE size_t tsdbBlockAggrSize(int nCols, uint32_t blkVer) {
@@ -227,17 +226,6 @@ static FORCE_INLINE size_t tsdbBlockAggrSize(int nCols, uint32_t blkVer) {
   }
 }
 
-static FORCE_INLINE int32_t tsdbBlockAggrCols(uint32_t blkLen, uint32_t blkVer) {
-  switch (blkVer) {
-    case TSDB_SBLK_VER_0:
-      ASSERT(false);
-      return 0;
-    case TSDB_SBLK_VER_1:
-    default:
-      return TSDB_BLOCK_AGGR_COLS(blkLen, 1);
-  }
-}
-
 int   tsdbInitReadH(SReadH *pReadh, STsdbRepo *pRepo);
 void  tsdbDestroyReadH(SReadH *pReadh);
 int   tsdbSetAndOpenReadFSet(SReadH *pReadh, SDFileSet *pSet);
diff --git a/src/tsdb/src/tsdbCommit.c b/src/tsdb/src/tsdbCommit.c
index 3a9793ac95451123a8dad02b797dc86b2196d837..9b79e11f5a324fbff26635c27ae7e7ecd2ae39ab 100644
--- a/src/tsdb/src/tsdbCommit.c
+++ b/src/tsdb/src/tsdbCommit.c
@@ -1216,7 +1216,7 @@ int tsdbWriteBlockImpl(STsdbRepo *pRepo, STable *pTable, SDFile *pDFile, SDFile
   pBlock->aggrStat = aggrStatus;
   pBlock->blkVer = SBlockVerLatest;
   pBlock->aggrOffset = (uint64_t)offsetAggr;
-  pBlock->aggrLen = tsizeAggr;
+  pBlock->aggrNumOfCols = nAggrCols;
   pBlock->padding = 0;  // padding filled with 0
 
   tsdbDebug("vgId:%d tid:%d a block of data is written to file %s, offset %" PRId64
diff --git a/src/tsdb/src/tsdbReadImpl.c b/src/tsdb/src/tsdbReadImpl.c
index afe901d1dc634c2e69474db0457c6885ca587279..0f238c9a16fb17b69ff0313763433f6322f3022b 100644
--- a/src/tsdb/src/tsdbReadImpl.c
+++ b/src/tsdb/src/tsdbReadImpl.c
@@ -469,8 +469,7 @@ static int tsdbLoadBlockStatisFromAggr(SReadH *pReadh, SBlock *pBlock) {
     return -1;
   }
 
-  size_t sizeAggr = pBlock->aggrLen;
-  // tsdbBlockAggrSize(pBlock->numOfCols, (uint32_t)pBlock->blkVer);
+  size_t sizeAggr = tsdbBlockAggrSize(pBlock->aggrNumOfCols, (uint32_t)pBlock->blkVer);
   if (tsdbMakeRoom((void **)(&(pReadh->pAggrBlkData)), sizeAggr) < 0) return -1;
 
   int64_t nreadAggr = tsdbReadDFile(pDFileAggr, (void *)(pReadh->pAggrBlkData), sizeAggr);
@@ -579,10 +578,9 @@ void tsdbGetBlockStatis(SReadH *pReadh, SDataStatis *pStatis, int numOfCols, SBl
     }
   } else if (pBlock->aggrStat) {
     SAggrBlkData *pAggrBlkData = pReadh->pAggrBlkData;
-    int32_t       nAggrBlkCols = tsdbBlockAggrCols(pBlock->aggrLen, pBlock->blkVer);
 
     for (int i = 0, j = 0; i < numOfCols;) {
-      if (j >= nAggrBlkCols) {
+      if (j >= pBlock->aggrNumOfCols) {
         pStatis[i].numOfNull = -1;
         i++;
         continue;