diff --git a/src/tsdb/inc/tsdbReadImpl.h b/src/tsdb/inc/tsdbReadImpl.h
index 12727adb89cdf3eebeb014a3b867b412c3a5d9ac..fe04e0ce2b4a724c30d87a33db3761874b561a65 100644
--- a/src/tsdb/inc/tsdbReadImpl.h
+++ b/src/tsdb/inc/tsdbReadImpl.h
@@ -71,12 +71,10 @@ 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;    \
-  uint64_t aggrNumOfCols : 16; \
-  uint64_t padding : 48
+#define SBlockFieldsP1   \
+  uint64_t aggrStat : 1; \
+  uint64_t blkVer : 7;   \
+  uint64_t aggrOffset : 56
 
 typedef struct {
   SBlockFieldsP0;
diff --git a/src/tsdb/src/tsdbCommit.c b/src/tsdb/src/tsdbCommit.c
index 9b79e11f5a324fbff26635c27ae7e7ecd2ae39ab..02d8aaeca973d081f899e20a5e9f471a1cd20597 100644
--- a/src/tsdb/src/tsdbCommit.c
+++ b/src/tsdb/src/tsdbCommit.c
@@ -1080,11 +1080,10 @@ int tsdbWriteBlockImpl(STsdbRepo *pRepo, STable *pTable, SDFile *pDFile, SDFile
 
   // Get # of cols not all NULL(not including key column)
   int nColsNotAllNull = 0;
-  int nAggrCols = 0;
   for (int ncol = 1; ncol < pDataCols->numOfCols; ncol++) {  // ncol from 1, we skip the timestamp column
     SDataCol *   pDataCol = pDataCols->cols + ncol;
     SBlockCol *  pBlockCol = pBlockData->cols + nColsNotAllNull;
-    SAggrBlkCol *pAggrBlkCol = (SAggrBlkCol *)pAggrBlkData + nAggrCols;
+    SAggrBlkCol *pAggrBlkCol = (SAggrBlkCol *)pAggrBlkData + nColsNotAllNull;
 
     if (isAllRowsNull(pDataCol)) {  // all data to commit are NULL, just ignore it
       continue;
@@ -1106,7 +1105,6 @@ int tsdbWriteBlockImpl(STsdbRepo *pRepo, STable *pTable, SDFile *pDFile, SDFile
       (*tDataTypes[pDataCol->type].statisFunc)(pDataCol->pData, rowsToWrite, &(pAggrBlkCol->min), &(pAggrBlkCol->max),
                                                &(pAggrBlkCol->sum), &(pAggrBlkCol->minIndex), &(pAggrBlkCol->maxIndex),
                                                &(pAggrBlkCol->numOfNull));
-      ++nAggrCols;
     }
     nColsNotAllNull++;
   }
@@ -1120,7 +1118,7 @@ int tsdbWriteBlockImpl(STsdbRepo *pRepo, STable *pTable, SDFile *pDFile, SDFile
   int32_t  lsize = tsize;
   int32_t  keyLen = 0;
 
-  uint32_t tsizeAggr = (uint32_t)tsdbBlockAggrSize(nAggrCols, SBlockVerLatest);
+  uint32_t tsizeAggr = (uint32_t)tsdbBlockAggrSize(nColsNotAllNull, SBlockVerLatest);
 
   for (int ncol = 0; ncol < pDataCols->numOfCols; ncol++) {
     // All not NULL columns finish
@@ -1188,7 +1186,7 @@ int tsdbWriteBlockImpl(STsdbRepo *pRepo, STable *pTable, SDFile *pDFile, SDFile
     return -1;
   }
 
-  uint32_t aggrStatus = ((nAggrCols > 0) && (rowsToWrite > 8)) ? 1 : 0;  // TODO: How to make the decision?
+  uint32_t aggrStatus = ((nColsNotAllNull > 0) && (rowsToWrite > 8)) ? 1 : 0;  // TODO: How to make the decision?
   if (aggrStatus > 0) {
     // pAggrBlkData->numOfCols = nColsNotAllNull;
 
@@ -1216,8 +1214,6 @@ int tsdbWriteBlockImpl(STsdbRepo *pRepo, STable *pTable, SDFile *pDFile, SDFile
   pBlock->aggrStat = aggrStatus;
   pBlock->blkVer = SBlockVerLatest;
   pBlock->aggrOffset = (uint64_t)offsetAggr;
-  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
             " numOfRows %d len %d numOfCols %" PRId16 " keyFirst %" PRId64 " keyLast %" PRId64,
diff --git a/src/tsdb/src/tsdbReadImpl.c b/src/tsdb/src/tsdbReadImpl.c
index 0f238c9a16fb17b69ff0313763433f6322f3022b..4976e8b8fb8213b6a9cdedbf380d812e117f1fc8 100644
--- a/src/tsdb/src/tsdbReadImpl.c
+++ b/src/tsdb/src/tsdbReadImpl.c
@@ -469,7 +469,7 @@ static int tsdbLoadBlockStatisFromAggr(SReadH *pReadh, SBlock *pBlock) {
     return -1;
   }
 
-  size_t sizeAggr = tsdbBlockAggrSize(pBlock->aggrNumOfCols, (uint32_t)pBlock->blkVer);
+  size_t sizeAggr = tsdbBlockAggrSize(pBlock->numOfCols, (uint32_t)pBlock->blkVer);
   if (tsdbMakeRoom((void **)(&(pReadh->pAggrBlkData)), sizeAggr) < 0) return -1;
 
   int64_t nreadAggr = tsdbReadDFile(pDFileAggr, (void *)(pReadh->pAggrBlkData), sizeAggr);
@@ -580,7 +580,7 @@ void tsdbGetBlockStatis(SReadH *pReadh, SDataStatis *pStatis, int numOfCols, SBl
     SAggrBlkData *pAggrBlkData = pReadh->pAggrBlkData;
 
     for (int i = 0, j = 0; i < numOfCols;) {
-      if (j >= pBlock->aggrNumOfCols) {
+      if (j >= pBlock->numOfCols) {
         pStatis[i].numOfNull = -1;
         i++;
         continue;