diff --git a/include/common/taosdef.h b/include/common/taosdef.h
index 5001a99c2a..6e344dfdb4 100644
--- a/include/common/taosdef.h
+++ b/include/common/taosdef.h
@@ -57,6 +57,8 @@ typedef enum {
   TD_ROW_PARTIAL_UPDATE = 2,
 } TDUpdateConfig;
 
+#define TD_SUPPORT_UPDATE(u) ((u) > 0)
+
 typedef enum {
   TSDB_STATIS_OK = 0,    // statis part exist and load successfully
   TSDB_STATIS_NONE = 1,  // statis part not exist
diff --git a/include/common/tdataformat.h b/include/common/tdataformat.h
index 8e07d4e669..8a87a1bd2e 100644
--- a/include/common/tdataformat.h
+++ b/include/common/tdataformat.h
@@ -482,7 +482,7 @@ void       tdResetDataCols(SDataCols *pCols);
 int32_t    tdInitDataCols(SDataCols *pCols, STSchema *pSchema);
 SDataCols *tdDupDataCols(SDataCols *pCols, bool keepData);
 SDataCols *tdFreeDataCols(SDataCols *pCols);
-int32_t tdMergeDataCols(SDataCols *target, SDataCols *source, int32_t rowsToMerge, int32_t *pOffset, bool forceSetNull);
+int32_t tdMergeDataCols(SDataCols *target, SDataCols *source, int32_t rowsToMerge, int32_t *pOffset, bool forceSetNull, TDRowVerT maxVer);
 
 // ----------------- K-V data row structure
 /* |<-------------------------------------- len -------------------------------------------->|
diff --git a/include/common/trow.h b/include/common/trow.h
index b7ffcd14c6..539bda078d 100644
--- a/include/common/trow.h
+++ b/include/common/trow.h
@@ -230,7 +230,7 @@ static FORCE_INLINE int32_t tdAppendColValToTpRow(SRowBuilder *pBuilder, TDRowVa
 static FORCE_INLINE int32_t tdAppendColValToKvRow(SRowBuilder *pBuilder, TDRowValT valType, const void *val,
                                                   bool isCopyVarData, int8_t colType, int16_t colIdx, int32_t offset,
                                                   col_id_t colId);
-int32_t tdAppendSTSRowToDataCol(STSRow *pRow, STSchema *pSchema, SDataCols *pCols, bool forceSetNull);
+int32_t tdAppendSTSRowToDataCol(STSRow *pRow, STSchema *pSchema, SDataCols *pCols);
 
 /**
  * @brief
diff --git a/include/common/ttypes.h b/include/common/ttypes.h
index 37d688a0ef..5f1cfc030a 100644
--- a/include/common/ttypes.h
+++ b/include/common/ttypes.h
@@ -27,6 +27,7 @@ extern "C" {
 typedef int32_t  VarDataOffsetT;
 typedef uint32_t TDRowLenT;
 typedef uint8_t  TDRowValT;
+typedef uint64_t TDRowVerT;
 typedef int16_t  col_id_t;
 typedef int8_t   col_type_t;
 typedef int32_t  col_bytes_t;
diff --git a/source/common/src/tdataformat.c b/source/common/src/tdataformat.c
index f6614633fb..f2a5a98d96 100644
--- a/source/common/src/tdataformat.c
+++ b/source/common/src/tdataformat.c
@@ -411,6 +411,7 @@ int tdInitDataCols(SDataCols *pCols, STSchema *pSchema) {
 #endif
 
   pCols->numOfRows = 0;
+  pCols->bitmapMode = 0;
   pCols->numOfCols = schemaNCols(pSchema);
 
   for (i = 0; i < schemaNCols(pSchema); ++i) {
diff --git a/source/common/src/trow.c b/source/common/src/trow.c
index d9c48bfe76..7392b0bf8b 100644
--- a/source/common/src/trow.c
+++ b/source/common/src/trow.c
@@ -385,7 +385,6 @@ int tdAppendValToDataCol(SDataCol *pCol, TDRowValT valType, const void *val, int
     pCol->len += pCol->bytes;
   }
 #ifdef TD_SUPPORT_BITMAP
-
     tdSetBitmapValType(pCol->pBitmap, numOfRows, valType, bitmapMode);
 #endif
   return 0;
@@ -486,7 +485,7 @@ static int32_t tdAppendKvRowToDataCol(STSRow *pRow, STSchema *pSchema, SDataCols
  * @param pCols
  * @param forceSetNull
  */
-int32_t tdAppendSTSRowToDataCol(STSRow *pRow, STSchema *pSchema, SDataCols *pCols, bool forceSetNull) {
+int32_t tdAppendSTSRowToDataCol(STSRow *pRow, STSchema *pSchema, SDataCols *pCols) {
   if (TD_IS_TP_ROW(pRow)) {
     return tdAppendTpRowToDataCol(pRow, pSchema, pCols);
   } else if (TD_IS_KV_ROW(pRow)) {
@@ -497,7 +496,7 @@ int32_t tdAppendSTSRowToDataCol(STSRow *pRow, STSchema *pSchema, SDataCols *pCol
   return TSDB_CODE_SUCCESS;
 }
 
-int tdMergeDataCols(SDataCols *target, SDataCols *source, int rowsToMerge, int *pOffset, bool forceSetNull) {
+int tdMergeDataCols(SDataCols *target, SDataCols *source, int rowsToMerge, int *pOffset, bool forceSetNull, TDRowVerT maxVer) {
   ASSERT(rowsToMerge > 0 && rowsToMerge <= source->numOfRows);
   ASSERT(target->numOfCols == source->numOfCols);
   int offset = 0;
@@ -510,6 +509,7 @@ int tdMergeDataCols(SDataCols *target, SDataCols *source, int rowsToMerge, int *
 
   if ((target->numOfRows == 0) || (dataColsKeyLast(target) < dataColsKeyAtRow(source, *pOffset))) {  // No overlap
     ASSERT(target->numOfRows + rowsToMerge <= target->maxPoints);
+    // TODO: filter the maxVer
     for (int i = 0; i < rowsToMerge; i++) {
       for (int j = 0; j < source->numOfCols; j++) {
         if (source->cols[j].len > 0 || target->cols[j].len > 0) {
@@ -555,9 +555,9 @@ static void tdMergeTwoDataCols(SDataCols *target, SDataCols *src1, int *iter1, i
     // TKEY  tkey2 = (*iter2 >= limit2) ? TKEY_NULL : dataColsTKeyAt(src2, *iter2);
 
     ASSERT(tkey1 == TKEY_NULL || (!TKEY_IS_DELETED(tkey1)));
-
+    // TODO: filter the maxVer
     if (key1 < key2) {
-      for (int i = 0; i < src1->numOfCols; i++) {
+      for (int i = 0; i < src1->numOfCols; ++i) {
         ASSERT(target->cols[i].type == src1->cols[i].type);
         if (src1->cols[i].len > 0 || target->cols[i].len > 0) {
           SCellVal sVal = {0};
@@ -568,12 +568,12 @@ static void tdMergeTwoDataCols(SDataCols *target, SDataCols *src1, int *iter1, i
         }
       }
 
-      target->numOfRows++;
-      (*iter1)++;
+      ++target->numOfRows;
+      ++(*iter1);
     } else if (key1 >= key2) {
-      // if ((key1 > key2) || (key1 == key2 && !TKEY_IS_DELETED(tkey2))) {
-      if ((key1 > key2) || (key1 == key2)) {
-        for (int i = 0; i < src2->numOfCols; i++) {
+      // TODO: filter the maxVer
+      if ((key1 > key2) || ((key1 == key2) && !TKEY_IS_DELETED(key2))) {
+        for (int i = 0; i < src2->numOfCols; ++i) {
           SCellVal sVal = {0};
           ASSERT(target->cols[i].type == src2->cols[i].type);
           if (tdGetColDataOfRow(&sVal, src2->cols + i, *iter2, src2->bitmapMode) < 0) {
@@ -590,11 +590,11 @@ static void tdMergeTwoDataCols(SDataCols *target, SDataCols *src1, int *iter1, i
             dataColSetNullAt(&target->cols[i], target->numOfRows, true, target->bitmapMode);
           }
         }
-        target->numOfRows++;
+        ++target->numOfRows;
       }
 
-      (*iter2)++;
-      if (key1 == key2) (*iter1)++;
+      ++(*iter2);
+      if (key1 == key2) ++(*iter1);
     }
 
     ASSERT(target->numOfRows <= target->maxPoints);
diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit.c b/source/dnode/vnode/src/tsdb/tsdbCommit.c
index 21ad1ec076..67c7973206 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -1678,10 +1678,11 @@ static void tsdbLoadAndMergeFromCache(SDataCols *pDataCols, int *iter, SCommitIt
         ASSERT(pSchema != NULL);
       }
 
-      tdAppendSTSRowToDataCol(row, pSchema, pTarget, true);
+      tdAppendSTSRowToDataCol(row, pSchema, pTarget);
 
       tSkipListIterNext(pCommitIter->pIter);
     } else {
+#if 0
       if (update != TD_ROW_OVERWRITE_UPDATE) {
         // copy disk data
         for (int i = 0; i < pDataCols->numOfCols; ++i) {
@@ -1706,6 +1707,43 @@ static void tsdbLoadAndMergeFromCache(SDataCols *pDataCols, int *iter, SCommitIt
       }
       ++(*iter);
       tSkipListIterNext(pCommitIter->pIter);
+#endif
+      // copy disk data
+      for (int i = 0; i < pDataCols->numOfCols; ++i) {
+        SCellVal sVal = {0};
+        if (tdGetColDataOfRow(&sVal, pDataCols->cols + i, *iter, pDataCols->bitmapMode) < 0) {
+          TASSERT(0);
+        }
+        // TODO: tdAppendValToDataCol may fail
+        tdAppendValToDataCol(pTarget->cols + i, sVal.valType, sVal.val, pTarget->numOfRows, pTarget->maxPoints,
+                             pTarget->bitmapMode);
+      }
+
+      if (TD_SUPPORT_UPDATE(update)) {
+        // copy mem data(Multi-Version)
+        if (pSchema == NULL || schemaVersion(pSchema) != TD_ROW_SVER(row)) {
+          pSchema = tsdbGetTableSchemaImpl(pCommitIter->pTable, false, false, TD_ROW_SVER(row));
+          ASSERT(pSchema != NULL);
+        }
+
+        // TODO: merge with Multi-Version
+        STSRow *curRow = row;
+
+        ++(*iter);
+        tSkipListIterNext(pCommitIter->pIter);
+        STSRow *nextRow = tsdbNextIterRow(pCommitIter->pIter);
+
+        if (key2 < TD_ROW_KEY(nextRow)) {
+          tdAppendSTSRowToDataCol(row, pSchema, pTarget);
+        } else {
+          tdAppendSTSRowToDataCol(row, pSchema, pTarget);
+        }
+        // TODO: merge with Multi-Version
+      } else {
+        ++pTarget->numOfRows;
+        ++(*iter);
+        tSkipListIterNext(pCommitIter->pIter);
+      }
     }
 
     if (pTarget->numOfRows >= maxRows) break;
diff --git a/source/dnode/vnode/src/tsdb/tsdbMemTable.c b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
index c657b2e947..54115003cf 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMemTable.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
@@ -475,7 +475,7 @@ static int tsdbAppendTableRowToCols(STable *pTable, SDataCols *pCols, STSchema *
       }
     }
 
-    tdAppendSTSRowToDataCol(row, *ppSchema, pCols, true);
+    tdAppendSTSRowToDataCol(row, *ppSchema, pCols);
   }
 
   return 0;
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 5677bb0615..e308c9c2b9 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -761,6 +761,7 @@ static TSKEY extractFirstTraverseKey(STableCheckInfo* pCheckInfo, int32_t order,
   TSKEY r2 = TD_ROW_KEY(rimem);
 
   if (r1 == r2) {
+#if 0
     if(update == TD_ROW_DISCARD_UPDATE){
       pCheckInfo->chosen = CHECKINFO_CHOSEN_IMEM;
       tSkipListIterNext(pCheckInfo->iter);
@@ -771,6 +772,13 @@ static TSKEY extractFirstTraverseKey(STableCheckInfo* pCheckInfo, int32_t order,
     } else {
       pCheckInfo->chosen = CHECKINFO_CHOSEN_BOTH;
     }
+#endif
+    if (TD_SUPPORT_UPDATE(update)) {
+      pCheckInfo->chosen = CHECKINFO_CHOSEN_BOTH;
+    } else {
+      pCheckInfo->chosen = CHECKINFO_CHOSEN_IMEM;
+      tSkipListIterNext(pCheckInfo->iter);
+    }
     return r1;
   } else if (r1 < r2 && ASCENDING_TRAVERSE(order)) {
     pCheckInfo->chosen = CHECKINFO_CHOSEN_MEM;
diff --git a/source/dnode/vnode/src/tsdb/tsdbReadImpl.c b/source/dnode/vnode/src/tsdb/tsdbReadImpl.c
index 87459593b5..e31ede09cc 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReadImpl.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReadImpl.c
@@ -263,8 +263,9 @@ int tsdbLoadBlockData(SReadH *pReadh, SBlock *pBlock, SBlockInfo *pBlkInfo) {
   for (int i = 1; i < pBlock->numOfSubBlocks; i++) {
     iBlock++;
     if (tsdbLoadBlockDataImpl(pReadh, iBlock, pReadh->pDCols[1]) < 0) return -1;
+    // TODO: use the real maxVersion to replace the UINT64_MAX to support Multi-Version
     if (tdMergeDataCols(pReadh->pDCols[0], pReadh->pDCols[1], pReadh->pDCols[1]->numOfRows, NULL,
-                        update != TD_ROW_PARTIAL_UPDATE) < 0)
+                        update != TD_ROW_PARTIAL_UPDATE, UINT64_MAX) < 0)
       return -1;
   }
 
@@ -293,8 +294,9 @@ int tsdbLoadBlockDataCols(SReadH *pReadh, SBlock *pBlock, SBlockInfo *pBlkInfo,
   for (int i = 1; i < pBlock->numOfSubBlocks; i++) {
     iBlock++;
     if (tsdbLoadBlockDataColsImpl(pReadh, iBlock, pReadh->pDCols[1], colIds, numOfColsIds) < 0) return -1;
+    // TODO: use the real maxVersion to replace the UINT64_MAX to support Multi-Version
     if (tdMergeDataCols(pReadh->pDCols[0], pReadh->pDCols[1], pReadh->pDCols[1]->numOfRows, NULL,
-                        update != TD_ROW_PARTIAL_UPDATE) < 0)
+                        update != TD_ROW_PARTIAL_UPDATE, UINT64_MAX) < 0)
       return -1;
   }
 
@@ -304,6 +306,7 @@ int tsdbLoadBlockDataCols(SReadH *pReadh, SBlock *pBlock, SBlockInfo *pBlkInfo,
       if (pDataCol->bitmap) {
         ASSERT(pDataCol->colId != PRIMARYKEY_TIMESTAMP_COL_ID);
         tdMergeBitmap(pDataCol->pBitmap, TD_BITMAP_BYTES(pReadh->pDCols[0]->numOfRows), pDataCol->pBitmap);
+        tdDataColsSetBitmapI(pReadh->pDCols[0]);
       }
     }
   }