diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index a824f8f0b3..6af1a1a79b 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -257,6 +257,10 @@ int32_t tsdbReadBlockIdx(SDataFReader *pReader, SArray *aBlockIdx);
 int32_t tsdbReadBlock(SDataFReader *pReader, SBlockIdx *pBlockIdx, SMapData *pMapData);
 int32_t tsdbReadBlockL(SDataFReader *pReader, SArray *aBlockL);
 int32_t tsdbReadBlockSma(SDataFReader *pReader, SBlock *pBlock, SArray *aColumnDataAgg);
+int32_t tsdbReadDataBlock(SDataFReader *pReader, SBlock *pBlock, SBlockData *pBlockData, int16_t *aColId,
+                          int32_t nColId);
+int32_t tsdbReadLastBlock(SDataFReader *pReader, SBlockL *pBlockL, SBlockData *pBlockData, int16_t *aColId,
+                          int32_t nColId);
 
 #if 0
 int32_t tsdbReadColData(SDataFReader *pReader, SBlockIdx *pBlockIdx, SBlock *pBlock, int16_t *aColId, int32_t nCol,
diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index 707aa3153d..c2bfad264b 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -507,7 +507,7 @@ static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow) {
 
         tMapDataGetItemByIdx(&state->blockMap, state->iBlock, &block, tGetBlock);
         /* code = tsdbReadBlockData(state->pDataFReader, &state->blockIdx, &block, &state->blockData, NULL, NULL); */
-        code = tsdbReadBlockData(state->pDataFReader, state->pBlockIdx, &block, state->pBlockData, NULL, NULL);
+        code = tsdbReadDataBlock(state->pDataFReader, &block, state->pBlockData, NULL, 0);
         if (code) goto _err;
 
         state->nRow = state->blockData.nRow;
diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit.c b/source/dnode/vnode/src/tsdb/tsdbCommit.c
index 4269a785a0..ad721ede7a 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -309,7 +309,7 @@ static int32_t tsdbCommitterNextLastRow(SCommitter *pCommitter) {
     pCommitter->dReader.iBlockL++;
     if (pCommitter->dReader.iBlockL < taosArrayGetSize(pCommitter->dReader.aBlockL)) {
       pCommitter->dReader.pBlockL = (SBlockL *)taosArrayGet(pCommitter->dReader.aBlockL, pCommitter->dReader.iBlockL);
-      code = tsdbReadLastBlock(pCommitter->dReader.pReader, pCommitter->dReader.pBlockL, pBlockDatal, NULL, NULL);
+      code = tsdbReadLastBlock(pCommitter->dReader.pReader, pCommitter->dReader.pBlockL, pBlockDatal, NULL, 0);
       if (code) goto _exit;
 
       pCommitter->dReader.iRow = 0;
@@ -593,7 +593,7 @@ static int32_t tsdbMergeCommitData(SCommitter *pCommitter, STbDataIter *pIter, S
   SBlockData *pBlockDataR = &pCommitter->dReader.bData;
   SBlockData *pBlockDataW = &pCommitter->dWriter.bData;
 
-  code = tsdbReadDataBlock(pCommitter->dReader.pReader, pBlock, pBlockDataR, NULL, NULL);
+  code = tsdbReadDataBlock(pCommitter->dReader.pReader, pBlock, pBlockDataR, NULL, 0);
   if (code) goto _err;
 
   tBlockDataClearData(pBlockDataW);
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 87cc000908..0157f0ed22 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -785,8 +785,7 @@ static int32_t doLoadFileBlockData(STsdbReader* pReader, SDataBlockIter* pBlockI
   SFileBlockDumpInfo* pDumpInfo = &pReader->status.fBlockDumpInfo;
 
   SBlockIdx blockIdx = {.suid = pReader->suid, .uid = pBlockScanInfo->uid};
-  int32_t   code =
-      tsdbReadColData(pReader->pFileReader, &blockIdx, pBlock, pSupInfo->colIds, numOfCols, pBlockData, NULL, NULL);
+  int32_t   code = tsdbReadDataBlock(pReader->pFileReader, pBlock, pBlockData, pSupInfo->colIds, numOfCols);
   if (code != TSDB_CODE_SUCCESS) {
     goto _error;
   }
diff --git a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
index 125e1bcb73..4f02299c7e 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
@@ -816,7 +816,7 @@ static int32_t tsdbReadBlockDataImpl(SDataFReader *pReader, SBlockInfo *pBlkInfo
           if (code) goto _err;
         }
       } else {
-        code = tsdbDecmprColData(pt + blockCol.offset, &blockCol, hdr.cmprAlg, hdr.nRow, pColData, pReader->pBuf2);
+        code = tsdbDecmprColData(pt + blockCol.offset, &blockCol, hdr.cmprAlg, hdr.nRow, pColData, &pReader->pBuf2);
         if (code) goto _err;
       }
     }
@@ -829,6 +829,39 @@ _err:
   return code;
 }
 
+int32_t tsdbReadDataBlock(SDataFReader *pReader, SBlock *pBlock, SBlockData *pBlockData, int16_t *aColId,
+                          int32_t nColId) {
+  int32_t code = 0;
+
+  code = tsdbReadBlockDataImpl(pReader, &pBlock->aSubBlock[0], 0, aColId, nColId, pBlockData);
+  if (code) goto _err;
+
+  for (int32_t iSubBlock = 1; iSubBlock < pBlock->nSubBlock; iSubBlock++) {
+    // TODO
+    ASSERT(0);
+  }
+
+  return code;
+
+_err:
+  tsdbError("vgId:%d tsdb read data block failed since %s", TD_VID(pReader->pTsdb->pVnode), tstrerror(code));
+  return code;
+}
+
+int32_t tsdbReadLastBlock(SDataFReader *pReader, SBlockL *pBlockL, SBlockData *pBlockData, int16_t *aColId,
+                          int32_t nColId) {
+  int32_t code = 0;
+
+  code = tsdbReadBlockDataImpl(pReader, &pBlockL->bInfo, 1, aColId, nColId, pBlockData);
+  if (code) goto _err;
+
+  return code;
+
+_err:
+  tsdbError("vgId:%d tsdb read last block failed since %s", TD_VID(pReader->pTsdb->pVnode), tstrerror(code));
+  return code;
+}
+
 #if 0
 static int32_t tsdbReadBlockDataKey(SBlockData *pBlockData, SBlockInfo *pSubBlock, uint8_t *pBuf, uint8_t **ppBuf) {
   int32_t code = 0;