diff --git a/src/tsdb/src/tsdbCommit.c b/src/tsdb/src/tsdbCommit.c
index 419d63b6d5c4480e75352bf3941f1f0ab676be59..aaac9247a08b6158d81c1fe3abd9fc499dd18ea0 100644
--- a/src/tsdb/src/tsdbCommit.c
+++ b/src/tsdb/src/tsdbCommit.c
@@ -740,4 +740,429 @@ static int tsdbCommitTableData(STSCommitHandle *pTSCh, int tid) {
 _err:
   taosRUnLockLatch(&(pIter->pTable->latch));
   return -1;
+}
+
+static int tsdbProcessAppendCommit(SRWHelper *pHelper, SCommitIter *pCommitIter, SDataCols *pDataCols, TSKEY maxKey) {
+  STsdbCfg * pCfg = &(pHelper->pRepo->config);
+  STable *   pTable = pCommitIter->pTable;
+  SBlockIdx * pIdx = &(pHelper->curCompIdx);
+  TSKEY      keyFirst = tsdbNextIterKey(pCommitIter->pIter);
+  int        defaultRowsInBlock = pCfg->maxRowsPerFileBlock * 4 / 5;
+  SBlock compBlock = {0};
+
+  ASSERT(pIdx->len <= 0 || keyFirst > pIdx->maxKey);
+  if (pIdx->hasLast) {  // append to with last block
+    ASSERT(pIdx->len > 0);
+    SBlock *pCompBlock = blockAtIdx(pHelper, pIdx->numOfBlocks - 1);
+    ASSERT(pCompBlock->last && pCompBlock->numOfRows < pCfg->minRowsPerFileBlock);
+    tdResetDataCols(pDataCols);
+    int rowsRead = tsdbLoadDataFromCache(pTable, pCommitIter->pIter, maxKey, defaultRowsInBlock - pCompBlock->numOfRows,
+                                         pDataCols, NULL, 0);
+    ASSERT(rowsRead > 0 && rowsRead == pDataCols->numOfRows);
+    if (rowsRead + pCompBlock->numOfRows < pCfg->minRowsPerFileBlock &&
+        pCompBlock->numOfSubBlocks < TSDB_MAX_SUBBLOCKS && !TSDB_NLAST_FILE_OPENED(pHelper)) {
+      if (tsdbWriteBlockToFile(pHelper, helperLastF(pHelper), pDataCols, &compBlock, true, false) < 0) return -1;
+      if (tsdbAddSubBlock(pHelper, &compBlock, pIdx->numOfBlocks - 1, rowsRead) < 0) return -1;
+    } else {
+      if (tsdbLoadBlockData(pHelper, pCompBlock, NULL) < 0) return -1;
+      ASSERT(pHelper->pDataCols[0]->numOfRows == pCompBlock->numOfRows);
+
+      if (tdMergeDataCols(pHelper->pDataCols[0], pDataCols, pDataCols->numOfRows) < 0) return -1;
+      ASSERT(pHelper->pDataCols[0]->numOfRows == pCompBlock->numOfRows + pDataCols->numOfRows);
+
+      if (tsdbWriteBlockToProperFile(pHelper, pHelper->pDataCols[0], &compBlock) < 0) return -1;
+      if (tsdbUpdateSuperBlock(pHelper, &compBlock, pIdx->numOfBlocks - 1) < 0) return -1;
+    }
+
+    if (pHelper->hasOldLastBlock) pHelper->hasOldLastBlock = false;
+  } else {
+    ASSERT(!pHelper->hasOldLastBlock);
+    tdResetDataCols(pDataCols);
+    int rowsRead = tsdbLoadDataFromCache(pTable, pCommitIter->pIter, maxKey, defaultRowsInBlock, pDataCols, NULL, 0);
+    ASSERT(rowsRead > 0 && rowsRead == pDataCols->numOfRows);
+
+    if (tsdbWriteBlockToProperFile(pHelper, pDataCols, &compBlock) < 0) return -1;
+    if (tsdbInsertSuperBlock(pHelper, &compBlock, pIdx->numOfBlocks) < 0) return -1;
+  }
+
+#ifndef NDEBUG
+  TSKEY keyNext = tsdbNextIterKey(pCommitIter->pIter);
+  ASSERT(keyNext < 0 || keyNext > pIdx->maxKey);
+#endif
+
+  return 0;
+}
+
+static int tsdbProcessMergeCommit(SRWHelper *pHelper, SCommitIter *pCommitIter, SDataCols *pDataCols, TSKEY maxKey,
+                                  int *blkIdx) {
+  STsdbCfg * pCfg = &(pHelper->pRepo->config);
+  STable *   pTable = pCommitIter->pTable;
+  SBlockIdx * pIdx = &(pHelper->curCompIdx);
+  SBlock compBlock = {0};
+  TSKEY      keyFirst = tsdbNextIterKey(pCommitIter->pIter);
+  int        defaultRowsInBlock = pCfg->maxRowsPerFileBlock * 4 / 5;
+  SDataCols *pDataCols0 = pHelper->pDataCols[0];
+
+  SSkipListIterator slIter = {0};
+
+  ASSERT(keyFirst <= pIdx->maxKey);
+
+  SBlock *pCompBlock = taosbsearch((void *)(&keyFirst), (void *)blockAtIdx(pHelper, *blkIdx),
+                                       pIdx->numOfBlocks - *blkIdx, sizeof(SBlock), compareKeyBlock, TD_GE);
+  ASSERT(pCompBlock != NULL);
+  int tblkIdx = (int32_t)(TSDB_GET_COMPBLOCK_IDX(pHelper, pCompBlock));
+
+  if (pCompBlock->last) {
+    ASSERT(pCompBlock->numOfRows < pCfg->minRowsPerFileBlock && tblkIdx == pIdx->numOfBlocks - 1);
+    int16_t colId = 0;
+    slIter = *(pCommitIter->pIter);
+    if (tsdbLoadBlockDataCols(pHelper, pCompBlock, NULL, &colId, 1) < 0) return -1;
+    ASSERT(pDataCols0->numOfRows == pCompBlock->numOfRows);
+
+    int rows1 = defaultRowsInBlock - pCompBlock->numOfRows;
+    int rows2 =
+        tsdbLoadDataFromCache(pTable, &slIter, maxKey, rows1, NULL, pDataCols0->cols[0].pData, pDataCols0->numOfRows);
+    if (rows2 == 0) {  // all data filtered out
+      *(pCommitIter->pIter) = slIter;
+    } else {
+      if (pCompBlock->numOfRows + rows2 < pCfg->minRowsPerFileBlock &&
+          pCompBlock->numOfSubBlocks < TSDB_MAX_SUBBLOCKS && !TSDB_NLAST_FILE_OPENED(pHelper)) {
+        tdResetDataCols(pDataCols);
+        int rowsRead = tsdbLoadDataFromCache(pTable, pCommitIter->pIter, maxKey, rows1, pDataCols,
+                                             pDataCols0->cols[0].pData, pDataCols0->numOfRows);
+        ASSERT(rowsRead == rows2 && rowsRead == pDataCols->numOfRows);
+        if (tsdbWriteBlockToFile(pHelper, helperLastF(pHelper), pDataCols, &compBlock, true, false) < 0) return -1;
+        if (tsdbAddSubBlock(pHelper, &compBlock, tblkIdx, rowsRead) < 0) return -1;
+        tblkIdx++;
+      } else {
+        if (tsdbLoadBlockData(pHelper, pCompBlock, NULL) < 0) return -1;
+        int round = 0;
+        int dIter = 0;
+        while (true) {
+          tdResetDataCols(pDataCols);
+          int rowsRead =
+              tsdbLoadAndMergeFromCache(pDataCols0, &dIter, pCommitIter, pDataCols, maxKey, defaultRowsInBlock);
+          if (rowsRead == 0) break;
+
+          if (tsdbWriteBlockToProperFile(pHelper, pDataCols, &compBlock) < 0) return -1;
+          if (round == 0) {
+            if (tsdbUpdateSuperBlock(pHelper, &compBlock, tblkIdx) < 0) return -1;
+          } else {
+            if (tsdbInsertSuperBlock(pHelper, &compBlock, tblkIdx) < 0) return -1;
+          }
+
+          tblkIdx++;
+          round++;
+        }
+      }
+      if (pHelper->hasOldLastBlock) pHelper->hasOldLastBlock = false;
+    }
+  } else {
+    TSKEY keyLimit = (tblkIdx == pIdx->numOfBlocks - 1) ? maxKey : (pCompBlock[1].keyFirst - 1);
+    TSKEY blkKeyFirst = pCompBlock->keyFirst;
+    TSKEY blkKeyLast = pCompBlock->keyLast;
+
+    if (keyFirst < blkKeyFirst) {
+      while (true) {
+        tdResetDataCols(pDataCols);
+        int rowsRead =
+            tsdbLoadDataFromCache(pTable, pCommitIter->pIter, blkKeyFirst - 1, defaultRowsInBlock, pDataCols, NULL, 0);
+        if (rowsRead == 0) break;
+
+        ASSERT(rowsRead == pDataCols->numOfRows);
+        if (tsdbWriteBlockToFile(pHelper, helperDataF(pHelper), pDataCols, &compBlock, false, true) < 0) return -1;
+        if (tsdbInsertSuperBlock(pHelper, &compBlock, tblkIdx) < 0) return -1;
+        tblkIdx++;
+      }
+      ASSERT(tblkIdx == 0 || (tsdbNextIterKey(pCommitIter->pIter) < 0 ||
+                              tsdbNextIterKey(pCommitIter->pIter) > blockAtIdx(pHelper, tblkIdx - 1)->keyLast));
+    } else {
+      ASSERT(keyFirst <= blkKeyLast);
+      int16_t colId = 0;
+      if (tsdbLoadBlockDataCols(pHelper, pCompBlock, NULL, &colId, 1) < 0) return -1;
+
+      slIter = *(pCommitIter->pIter);
+      int rows1 = (pCfg->maxRowsPerFileBlock - pCompBlock->numOfRows);
+      int rows2 = tsdbLoadDataFromCache(pTable, &slIter, blkKeyLast, INT_MAX, NULL, pDataCols0->cols[0].pData,
+                                        pDataCols0->numOfRows);
+
+      if (rows2 == 0) {  // all filtered out
+        *(pCommitIter->pIter) = slIter;
+        ASSERT(tblkIdx == 0 || (tsdbNextIterKey(pCommitIter->pIter) < 0 ||
+                                tsdbNextIterKey(pCommitIter->pIter) > blockAtIdx(pHelper, tblkIdx - 1)->keyLast));
+      } else {
+        int rows3 = tsdbLoadDataFromCache(pTable, &slIter, keyLimit, INT_MAX, NULL, NULL, 0) + rows2;
+
+        if (pCompBlock->numOfSubBlocks < TSDB_MAX_SUBBLOCKS && rows1 >= rows2) {
+          int rows = (rows1 >= rows3) ? rows3 : rows2;
+          tdResetDataCols(pDataCols);
+          int rowsRead = tsdbLoadDataFromCache(pTable, pCommitIter->pIter, keyLimit, rows, pDataCols,
+                                               pDataCols0->cols[0].pData, pDataCols0->numOfRows);
+          ASSERT(rowsRead == rows && rowsRead == pDataCols->numOfRows);
+          if (tsdbWriteBlockToFile(pHelper, helperDataF(pHelper), pDataCols, &compBlock, false, false) < 0)
+            return -1;
+          if (tsdbAddSubBlock(pHelper, &compBlock, tblkIdx, rowsRead) < 0) return -1;
+          tblkIdx++;
+          ASSERT(tblkIdx == 0 || (tsdbNextIterKey(pCommitIter->pIter) < 0 ||
+                                  tsdbNextIterKey(pCommitIter->pIter) > blockAtIdx(pHelper, tblkIdx - 1)->keyLast));
+        } else {
+          if (tsdbLoadBlockData(pHelper, pCompBlock, NULL) < 0) return -1;
+          int round = 0;
+          int dIter = 0;
+          while (true) {
+            int rowsRead =
+                tsdbLoadAndMergeFromCache(pDataCols0, &dIter, pCommitIter, pDataCols, keyLimit, defaultRowsInBlock);
+            if (rowsRead == 0) break;
+
+            if (tsdbWriteBlockToFile(pHelper, helperDataF(pHelper), pDataCols, &compBlock, false, true) < 0)
+              return -1;
+            if (round == 0) {
+              if (tsdbUpdateSuperBlock(pHelper, &compBlock, tblkIdx) < 0) return -1;
+            } else {
+              if (tsdbInsertSuperBlock(pHelper, &compBlock, tblkIdx) < 0) return -1;
+            }
+
+            round++;
+            tblkIdx++;
+          }
+          ASSERT(tblkIdx == 0 || (tsdbNextIterKey(pCommitIter->pIter) < 0 ||
+                                  tsdbNextIterKey(pCommitIter->pIter) > blockAtIdx(pHelper, tblkIdx - 1)->keyLast));
+        }
+      }
+    }
+  }
+
+  *blkIdx = tblkIdx;
+  return 0;
+}
+
+static int tsdbLoadAndMergeFromCache(SDataCols *pDataCols, int *iter, SCommitIter *pCommitIter, SDataCols *pTarget,
+                                     TSKEY maxKey, int maxRows) {
+  int       numOfRows = 0;
+  TSKEY     key1 = INT64_MAX;
+  TSKEY     key2 = INT64_MAX;
+  STSchema *pSchema = NULL;
+
+  ASSERT(maxRows > 0 && dataColsKeyLast(pDataCols) <= maxKey);
+  tdResetDataCols(pTarget);
+
+  while (true) {
+    key1 = (*iter >= pDataCols->numOfRows) ? INT64_MAX : dataColsKeyAt(pDataCols, *iter);
+    SDataRow row = tsdbNextIterRow(pCommitIter->pIter);
+    key2 = (row == NULL || dataRowKey(row) > maxKey) ? INT64_MAX : dataRowKey(row);
+
+    if (key1 == INT64_MAX && key2 == INT64_MAX) break;
+
+    if (key1 <= key2) {
+      for (int i = 0; i < pDataCols->numOfCols; i++) {
+        dataColAppendVal(pTarget->cols + i, tdGetColDataOfRow(pDataCols->cols + i, *iter), pTarget->numOfRows,
+                         pTarget->maxPoints);
+      }
+      pTarget->numOfRows++;
+      (*iter)++;
+      if (key1 == key2) tSkipListIterNext(pCommitIter->pIter);
+    } else {
+      if (pSchema == NULL || schemaVersion(pSchema) != dataRowVersion(row)) {
+        pSchema = tsdbGetTableSchemaImpl(pCommitIter->pTable, false, false, dataRowVersion(row));
+        ASSERT(pSchema != NULL);
+      }
+
+      tdAppendDataRowToDataCol(row, pSchema, pTarget);
+      tSkipListIterNext(pCommitIter->pIter);
+    }
+
+    numOfRows++;
+    if (numOfRows >= maxRows) break;
+    ASSERT(numOfRows == pTarget->numOfRows && numOfRows <= pTarget->maxPoints);
+  }
+
+  return numOfRows;
+}
+
+static int tsdbWriteBlockToProperFile(SRWHelper *pHelper, SDataCols *pDataCols, SBlock *pCompBlock) {
+  STsdbCfg *pCfg = &(pHelper->pRepo->config);
+  SFile *   pFile = NULL;
+  bool      isLast = false;
+
+  ASSERT(pDataCols->numOfRows > 0);
+
+  if (pDataCols->numOfRows >= pCfg->minRowsPerFileBlock) {
+    pFile = helperDataF(pHelper);
+  } else {
+    isLast = true;
+    pFile = TSDB_NLAST_FILE_OPENED(pHelper) ? helperNewLastF(pHelper) : helperLastF(pHelper);
+  }
+
+  ASSERT(pFile->fd > 0);
+
+  if (tsdbWriteBlockToFile(pHelper, pFile, pDataCols, pCompBlock, isLast, true) < 0) return -1;
+
+  return 0;
+}
+
+static int tsdbInsertSuperBlock(SRWHelper *pHelper, SBlock *pCompBlock, int blkIdx) {
+  SBlockIdx *pIdx = &(pHelper->curCompIdx);
+
+  ASSERT(blkIdx >= 0 && blkIdx <= (int)pIdx->numOfBlocks);
+  ASSERT(pCompBlock->numOfSubBlocks == 1);
+
+  // Adjust memory if no more room
+  if (pIdx->len == 0) pIdx->len = sizeof(SBlockInfo) + sizeof(TSCKSUM);
+  if (tsdbAdjustInfoSizeIfNeeded(pHelper, pIdx->len + sizeof(SBlockInfo)) < 0) goto _err;
+
+  // Change the offset
+  for (uint32_t i = 0; i < pIdx->numOfBlocks; i++) {
+    SBlock *pTCompBlock = &pHelper->pCompInfo->blocks[i];
+    if (pTCompBlock->numOfSubBlocks > 1) pTCompBlock->offset += sizeof(SBlock);
+  }
+
+  // Memmove if needed
+  int tsize = pIdx->len - (sizeof(SBlockInfo) + sizeof(SBlock) * blkIdx);
+  if (tsize > 0) {
+    ASSERT(sizeof(SBlockInfo) + sizeof(SBlock) * (blkIdx + 1) < taosTSizeof(pHelper->pCompInfo));
+    ASSERT(sizeof(SBlockInfo) + sizeof(SBlock) * (blkIdx + 1) + tsize <= taosTSizeof(pHelper->pCompInfo));
+    memmove(POINTER_SHIFT(pHelper->pCompInfo, sizeof(SBlockInfo) + sizeof(SBlock) * (blkIdx + 1)),
+            POINTER_SHIFT(pHelper->pCompInfo, sizeof(SBlockInfo) + sizeof(SBlock) * blkIdx), tsize);
+  }
+  pHelper->pCompInfo->blocks[blkIdx] = *pCompBlock;
+
+  pIdx->numOfBlocks++;
+  pIdx->len += sizeof(SBlock);
+  ASSERT(pIdx->len <= taosTSizeof(pHelper->pCompInfo));
+  pIdx->maxKey = blockAtIdx(pHelper, pIdx->numOfBlocks - 1)->keyLast;
+  pIdx->hasLast = (uint32_t)blockAtIdx(pHelper, pIdx->numOfBlocks - 1)->last;
+
+  if (pIdx->numOfBlocks > 1) {
+    ASSERT(pHelper->pCompInfo->blocks[0].keyLast < pHelper->pCompInfo->blocks[1].keyFirst);
+  }
+
+  tsdbDebug("vgId:%d tid:%d a super block is inserted at index %d", REPO_ID(pHelper->pRepo), pHelper->tableInfo.tid,
+            blkIdx);
+
+  return 0;
+
+_err:
+  return -1;
+}
+
+static int tsdbAddSubBlock(SRWHelper *pHelper, SBlock *pCompBlock, int blkIdx, int rowsAdded) {
+  ASSERT(pCompBlock->numOfSubBlocks == 0);
+
+  SBlockIdx *pIdx = &(pHelper->curCompIdx);
+  ASSERT(blkIdx >= 0 && blkIdx < (int)pIdx->numOfBlocks);
+
+  SBlock *pSCompBlock = pHelper->pCompInfo->blocks + blkIdx;
+  ASSERT(pSCompBlock->numOfSubBlocks >= 1 && pSCompBlock->numOfSubBlocks < TSDB_MAX_SUBBLOCKS);
+
+  size_t spaceNeeded =
+      (pSCompBlock->numOfSubBlocks == 1) ? pIdx->len + sizeof(SBlock) * 2 : pIdx->len + sizeof(SBlock);
+  if (tsdbAdjustInfoSizeIfNeeded(pHelper, spaceNeeded) < 0) goto _err;
+
+  pSCompBlock = pHelper->pCompInfo->blocks + blkIdx;
+
+  // Add the sub-block
+  if (pSCompBlock->numOfSubBlocks > 1) {
+    size_t tsize = (size_t)(pIdx->len - (pSCompBlock->offset + pSCompBlock->len));
+    if (tsize > 0) {
+      memmove((void *)((char *)(pHelper->pCompInfo) + pSCompBlock->offset + pSCompBlock->len + sizeof(SBlock)),
+              (void *)((char *)(pHelper->pCompInfo) + pSCompBlock->offset + pSCompBlock->len), tsize);
+
+      for (uint32_t i = blkIdx + 1; i < pIdx->numOfBlocks; i++) {
+        SBlock *pTCompBlock = &pHelper->pCompInfo->blocks[i];
+        if (pTCompBlock->numOfSubBlocks > 1) pTCompBlock->offset += sizeof(SBlock);
+      }
+    }
+
+    *(SBlock *)((char *)(pHelper->pCompInfo) + pSCompBlock->offset + pSCompBlock->len) = *pCompBlock;
+
+    pSCompBlock->numOfSubBlocks++;
+    ASSERT(pSCompBlock->numOfSubBlocks <= TSDB_MAX_SUBBLOCKS);
+    pSCompBlock->len += sizeof(SBlock);
+    pSCompBlock->numOfRows += rowsAdded;
+    pSCompBlock->keyFirst = MIN(pSCompBlock->keyFirst, pCompBlock->keyFirst);
+    pSCompBlock->keyLast = MAX(pSCompBlock->keyLast, pCompBlock->keyLast);
+    pIdx->len += sizeof(SBlock);
+  } else {  // Need to create two sub-blocks
+    void *ptr = NULL;
+    for (uint32_t i = blkIdx + 1; i < pIdx->numOfBlocks; i++) {
+      SBlock *pTCompBlock = pHelper->pCompInfo->blocks + i;
+      if (pTCompBlock->numOfSubBlocks > 1) {
+        ptr = POINTER_SHIFT(pHelper->pCompInfo, pTCompBlock->offset);
+        break;
+      }
+    }
+
+    if (ptr == NULL) ptr = POINTER_SHIFT(pHelper->pCompInfo, pIdx->len - sizeof(TSCKSUM));
+
+    size_t tsize = pIdx->len - ((char *)ptr - (char *)(pHelper->pCompInfo));
+    if (tsize > 0) {
+      memmove(POINTER_SHIFT(ptr, sizeof(SBlock) * 2), ptr, tsize);
+      for (uint32_t i = blkIdx + 1; i < pIdx->numOfBlocks; i++) {
+        SBlock *pTCompBlock = pHelper->pCompInfo->blocks + i;
+        if (pTCompBlock->numOfSubBlocks > 1) pTCompBlock->offset += (sizeof(SBlock) * 2);
+      }
+    }
+
+    ((SBlock *)ptr)[0] = *pSCompBlock;
+    ((SBlock *)ptr)[0].numOfSubBlocks = 0;
+
+    ((SBlock *)ptr)[1] = *pCompBlock;
+
+    pSCompBlock->numOfSubBlocks = 2;
+    pSCompBlock->numOfRows += rowsAdded;
+    pSCompBlock->offset = ((char *)ptr) - ((char *)pHelper->pCompInfo);
+    pSCompBlock->len = sizeof(SBlock) * 2;
+    pSCompBlock->keyFirst = MIN(((SBlock *)ptr)[0].keyFirst, ((SBlock *)ptr)[1].keyFirst);
+    pSCompBlock->keyLast = MAX(((SBlock *)ptr)[0].keyLast, ((SBlock *)ptr)[1].keyLast);
+
+    pIdx->len += (sizeof(SBlock) * 2);
+  }
+
+  pIdx->maxKey = pHelper->pCompInfo->blocks[pIdx->numOfBlocks - 1].keyLast;
+  pIdx->hasLast = (uint32_t)pHelper->pCompInfo->blocks[pIdx->numOfBlocks - 1].last;
+
+  tsdbDebug("vgId:%d tid:%d a subblock is added at index %d", REPO_ID(pHelper->pRepo), pHelper->tableInfo.tid, blkIdx);
+
+  return 0;
+
+_err:
+  return -1;
+}
+
+static int tsdbUpdateSuperBlock(SRWHelper *pHelper, SBlock *pCompBlock, int blkIdx) {
+  ASSERT(pCompBlock->numOfSubBlocks == 1);
+
+  SBlockIdx *pIdx = &(pHelper->curCompIdx);
+
+  ASSERT(blkIdx >= 0 && blkIdx < (int)pIdx->numOfBlocks);
+
+  SBlock *pSCompBlock = pHelper->pCompInfo->blocks + blkIdx;
+
+  ASSERT(pSCompBlock->numOfSubBlocks >= 1);
+
+  // Delete the sub blocks it has
+  if (pSCompBlock->numOfSubBlocks > 1) {
+    size_t tsize = (size_t)(pIdx->len - (pSCompBlock->offset + pSCompBlock->len));
+    if (tsize > 0) {
+      memmove(POINTER_SHIFT(pHelper->pCompInfo, pSCompBlock->offset),
+              POINTER_SHIFT(pHelper->pCompInfo, pSCompBlock->offset + pSCompBlock->len), tsize);
+    }
+
+    for (uint32_t i = blkIdx + 1; i < pIdx->numOfBlocks; i++) {
+      SBlock *pTCompBlock = &pHelper->pCompInfo->blocks[i];
+      if (pTCompBlock->numOfSubBlocks > 1) pTCompBlock->offset -= (sizeof(SBlock) * pSCompBlock->numOfSubBlocks);
+    }
+
+    pIdx->len -= (sizeof(SBlock) * pSCompBlock->numOfSubBlocks);
+  }
+
+  *pSCompBlock = *pCompBlock;
+
+  pIdx->maxKey = blockAtIdx(pHelper, pIdx->numOfBlocks - 1)->keyLast;
+  pIdx->hasLast = (uint32_t)blockAtIdx(pHelper, pIdx->numOfBlocks - 1)->last;
+
+  tsdbDebug("vgId:%d tid:%d a super block is updated at index %d", REPO_ID(pHelper->pRepo), pHelper->tableInfo.tid,
+            blkIdx);
+
+  return 0;
 }
\ No newline at end of file
diff --git a/src/tsdb/src/tsdbReadUtil.c b/src/tsdb/src/tsdbReadUtil.c
index d78b4e3a0c22713725b6231f5aea00bfe1768b16..acf25d1fc2c9e2653f55ec0996ae666318ec8465 100644
--- a/src/tsdb/src/tsdbReadUtil.c
+++ b/src/tsdb/src/tsdbReadUtil.c
@@ -174,13 +174,14 @@ int tsdbLoadBlockInfo(SReadHandle *pReadH) {
 }
 
 int tsdbLoadBlockData(SReadHandle *pReadH, SBlock *pBlock, SBlockInfo *pBlockInfo) {
-  // TODO
+  ASSERT(pBlock->numOfSubBlocks >= 1);
+
   SBlock *pSubBlock = pBlock;
   int     nSubBlocks = pBlock->numOfSubBlocks;
 
   if (nSubBlocks > 1) {
     if (pBlockInfo == NULL) pBlockInfo = pReadH->pBlockInfo;
-    pSubBlock = (SBlock *)POINTER_SHIFT((void *)pReadH->pBlockInfo, pBlock->offset);
+    pSubBlock = (SBlock *)POINTER_SHIFT((void *)pBlockInfo, pBlock->offset);
   }
 
   if (tsdbLoadBlockDataImpl(pReadH, pSubBlock, pReadH->pDataCols[0]) < 0) return -1;
@@ -198,7 +199,23 @@ int tsdbLoadBlockData(SReadHandle *pReadH, SBlock *pBlock, SBlockInfo *pBlockInf
 }
 
 int tsdbLoadBlockDataCols(SReadHandle *pReadH, SBlock *pBlock, SBlockInfo *pBlockInfo, int16_t *colIds, int numOfCols) {
-  // TODO
+  ASSERT(pBlock->numOfSubBlocks >= 1);
+
+  SBlock *pSubBlock = pBlock;
+  int     nSubBlock = pBlock->numOfSubBlocks;
+
+  if (nSubBlock > 1) {
+    if (pBlockInfo == NULL) pBlockInfo = pReadH->pBlockInfo;
+    pSubBlock = (SBlock *)POINTER_SHIFT((void *)pBlockInfo, pBlock->offset);
+  }
+
+  if (tsdbLoadBlockDataColsImpl(pReadH, pSubBlock, pReadH->pDataCols[0], colIds, numOfCols) < 0) return -1;
+  for (int i = 1; i < nSubBlock; i++) {
+    pSubBlock++;
+    if (tsdbLoadBlockDataColsImpl(pReadH, pSubBlock, pReadH->pDataCols[1], colIds, numOfCols) < 0) return -1;
+    if (tdMergeDataCols(pReadH->pDataCols[0], pReadH->pDataCols[1], pReadH->pDataCols[1]->numOfRows) < 0) goto _err;
+  }
+
   return 0;
 }
 
@@ -299,9 +316,83 @@ static int tsdbLoadBlockDataImpl(SReadHandle *pReadH, SBlock *pBlock, SDataCols
   return 0;
 }
 
-static int tsdbLoadBlockDataColsImpl() {
-  // TODO
+static int tsdbLoadBlockDataColsImpl(SReadHandle *pReadH, SBlock *pBlock, SDataCols *pDataCols, int16_t *colIds,
+                                     int numOfColIds) {
+  ASSERT(pBlock->numOfSubBlocks <= 1);
+  ASSERT(colIds[0] == 0);
+
+  SFile *pFile =
+      pBlock->last ? TSDB_READ_FILE(pReadH, TSDB_FILE_TYPE_LAST) : TSDB_READ_FILE(pReadH, TSDB_FILE_TYPE_DATA);
+  SBlockCol compCol = {0};
+
+  // If only load timestamp column, no need to load SBlockData part
+  if (numOfColIds > 1 && tsdbLoadCompData(pHelper, pCompBlock, NULL) < 0) goto _err;
+
+  pDataCols->numOfRows = pCompBlock->numOfRows;
+
+  int dcol = 0;
+  int ccol = 0;
+  for (int i = 0; i < numOfColIds; i++) {
+    int16_t   colId = colIds[i];
+    SDataCol *pDataCol = NULL;
+    SBlockCol *pCompCol = NULL;
+
+    while (true) {
+      if (dcol >= pDataCols->numOfCols) {
+        pDataCol = NULL;
+        break;
+      }
+      pDataCol = &pDataCols->cols[dcol];
+      if (pDataCol->colId > colId) {
+        pDataCol = NULL;
+        break;
+      } else {
+        dcol++;
+        if (pDataCol->colId == colId) break;
+      }
+    }
+
+    if (pDataCol == NULL) continue;
+    ASSERT(pDataCol->colId == colId);
+
+    if (colId == 0) {  // load the key row
+      compCol.colId = colId;
+      compCol.len = pCompBlock->keyLen;
+      compCol.type = pDataCol->type;
+      compCol.offset = TSDB_KEY_COL_OFFSET;
+      pCompCol = &compCol;
+    } else {  // load non-key rows
+      while (true) {
+        if (ccol >= pCompBlock->numOfCols) {
+          pCompCol = NULL;
+          break;
+        }
+
+        pCompCol = &(pHelper->pCompData->cols[ccol]);
+        if (pCompCol->colId > colId) {
+          pCompCol = NULL;
+          break;
+        } else {
+          ccol++;
+          if (pCompCol->colId == colId) break;
+        }
+      }
+
+      if (pCompCol == NULL) {
+        dataColSetNEleNull(pDataCol, pCompBlock->numOfRows, pDataCols->maxPoints);
+        continue;
+      }
+
+      ASSERT(pCompCol->colId == pDataCol->colId);
+    }
+
+    if (tsdbLoadColData(pHelper, pFile, pCompBlock, pCompCol, pDataCol) < 0) goto _err;
+  }
+
   return 0;
+
+_err:
+  return -1;
 }
 
 static int tsdbDecodeBlockIdxArray(SReadHandle *pReadH) {
@@ -381,5 +472,46 @@ static int tsdbCheckAndDecodeColumnData(SDataCol *pDataCol, char *content, int32
       dataColSetOffset(pDataCol, numOfRows);
     }
   }
+  return 0;
+}
+
+static int tsdbLoadColData(SRWHelper *pHelper, SFile *pFile, SBlock *pCompBlock, SBlockCol *pCompCol,
+                           SDataCol *pDataCol) {
+  ASSERT(pDataCol->colId == pCompCol->colId);
+  int tsize = pDataCol->bytes * pCompBlock->numOfRows + COMP_OVERFLOW_BYTES;
+  pHelper->pBuffer = taosTRealloc(pHelper->pBuffer, pCompCol->len);
+  if (pHelper->pBuffer == NULL) {
+    terrno = TSDB_CODE_TDB_OUT_OF_MEMORY;
+    return -1;
+  }
+
+  pHelper->compBuffer = taosTRealloc(pHelper->compBuffer, tsize);
+  if (pHelper->compBuffer == NULL) {
+    terrno = TSDB_CODE_TDB_OUT_OF_MEMORY;
+    return -1;
+  }
+
+  int64_t offset = pCompBlock->offset + TSDB_GET_COMPCOL_LEN(pCompBlock->numOfCols) + pCompCol->offset;
+  if (lseek(pFile->fd, (off_t)offset, SEEK_SET) < 0) {
+    tsdbError("vgId:%d failed to lseek file %s since %s", REPO_ID(pHelper->pRepo), pFile->fname, strerror(errno));
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    return -1;
+  }
+
+  if (taosTRead(pFile->fd, pHelper->pBuffer, pCompCol->len) < pCompCol->len) {
+    tsdbError("vgId:%d failed to read %d bytes from file %s since %s", REPO_ID(pHelper->pRepo), pCompCol->len, pFile->fname,
+              strerror(errno));
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    return -1;
+  }
+
+  if (tsdbCheckAndDecodeColumnData(pDataCol, pHelper->pBuffer, pCompCol->len, pCompBlock->algorithm,
+                                   pCompBlock->numOfRows, pHelper->pRepo->config.maxRowsPerFileBlock,
+                                   pHelper->compBuffer, (int32_t)taosTSizeof(pHelper->compBuffer)) < 0) {
+    tsdbError("vgId:%d file %s is broken at column %d offset %" PRId64, REPO_ID(pHelper->pRepo), pFile->fname,
+              pCompCol->colId, offset);
+    return -1;
+  }
+
   return 0;
 }
\ No newline at end of file