diff --git a/source/common/src/trow.c b/source/common/src/trow.c
index 4c063b205f124b78e9a5f784eea075cb99e784c6..261b6e1d6754b854314e1979e933d66aeaecd57d 100644
--- a/source/common/src/trow.c
+++ b/source/common/src/trow.c
@@ -466,7 +466,7 @@ int tdAppendValToDataCol(SDataCol *pCol, TDRowValT valType, const void *val, int
       memcpy(POINTER_SHIFT(pCol->pData, pCol->len), value, pCol->bytes);
       pCol->len += pCol->bytes;
     }
-  } else {
+  } else if (!tdValTypeIsNone(valType)) {
     if (IS_VAR_DATA_TYPE(pCol->type)) {
       // keep the last offset
       // discard the last var data
@@ -483,7 +483,9 @@ int tdAppendValToDataCol(SDataCol *pCol, TDRowValT valType, const void *val, int
   }
 
 #ifdef TD_SUPPORT_BITMAP
-  tdSetBitmapValType(pCol->pBitmap, numOfRows, valType, bitmapMode);
+  if (!isMerge || !tdValTypeIsNone(valType)) {
+    tdSetBitmapValType(pCol->pBitmap, numOfRows, valType, bitmapMode);
+  }
 #endif
   return 0;
 }
@@ -533,7 +535,9 @@ static int32_t tdAppendTpRowToDataCol(STSRow *pRow, STSchema *pSchema, SDataCols
       ++dcol;
     }
   }
+#if 0  
   ++pCols->numOfRows;
+#endif
 
   return TSDB_CODE_SUCCESS;
 }
@@ -584,7 +588,9 @@ static int32_t tdAppendKvRowToDataCol(STSRow *pRow, STSchema *pSchema, SDataCols
       ++dcol;
     }
   }
+#if 0
   ++pCols->numOfRows;
+#endif
 
   return TSDB_CODE_SUCCESS;
 }
@@ -698,7 +704,7 @@ static void tdAppendValToDataCols(SDataCols *target, SDataCols *src, int iter, b
           tdAppendValToDataCol(&(target->cols[i]), sVal.valType, sVal.val, target->numOfRows, target->maxPoints,
                                target->bitmapMode, isMerge);
         } else {
-          // Keep the origi value for None
+          // Keep the origin value for None
         }
       } else {
         tdAppendValToDataCol(&(target->cols[i]), sVal.valType, sVal.val, target->numOfRows, target->maxPoints,
diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit.c b/source/dnode/vnode/src/tsdb/tsdbCommit.c
index b255622c60758a55c18242d92835c5e12f664538..a008c4a0e5d09fbf3cecae9ae4ae03ab5e1600ab 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -1330,13 +1330,15 @@ static void tsdbLoadAndMergeFromCache(SDataCols *pDataCols, int *iter, SCommitIt
                                       TSKEY maxKey, int maxRows, int8_t update) {
   TSKEY     key1 = INT64_MAX;
   TSKEY     key2 = INT64_MAX;
+  TSKEY     lastKey = TSKEY_INITIAL_VAL;
   STSchema *pSchema = NULL;
 
   ASSERT(maxRows > 0 && dataColsKeyLast(pDataCols) <= maxKey);
   tdResetDataCols(pTarget);
 
   pTarget->bitmapMode = pDataCols->bitmapMode;
-
+  // TODO: filter Multi-Version
+  // TODO: support delete function
   while (true) {
     key1 = (*iter >= pDataCols->numOfRows) ? INT64_MAX : dataColsKeyAt(pDataCols, *iter);
     STSRow *row = tsdbNextIterRow(pCommitIter->pIter);
@@ -1349,6 +1351,9 @@ static void tsdbLoadAndMergeFromCache(SDataCols *pDataCols, int *iter, SCommitIt
     if (key1 == INT64_MAX && key2 == INT64_MAX) break;
 
     if (key1 < key2) {
+      if (lastKey != TSKEY_INITIAL_VAL) {
+        ++pTarget->numOfRows;
+      }
       for (int i = 0; i < pDataCols->numOfCols; ++i) {
         // TODO: dataColAppendVal may fail
         SCellVal sVal = {0};
@@ -1359,7 +1364,7 @@ static void tsdbLoadAndMergeFromCache(SDataCols *pDataCols, int *iter, SCommitIt
                              pTarget->bitmapMode, false);
       }
 
-      ++pTarget->numOfRows;
+      lastKey = key1;
       ++(*iter);
     } else if (key1 > key2) {
       if (pSchema == NULL || schemaVersion(pSchema) != TD_ROW_SVER(row)) {
@@ -1367,7 +1372,17 @@ static void tsdbLoadAndMergeFromCache(SDataCols *pDataCols, int *iter, SCommitIt
         ASSERT(pSchema != NULL);
       }
 
-      tdAppendSTSRowToDataCol(row, pSchema, pTarget, false);
+      if (key2 == lastKey) {
+        if (TD_SUPPORT_UPDATE(update)) {
+          tdAppendSTSRowToDataCol(row, pSchema, pTarget, true);
+        }
+      } else {
+        if (lastKey != TSKEY_INITIAL_VAL) {
+          ++pTarget->numOfRows;
+        }
+        tdAppendSTSRowToDataCol(row, pSchema, pTarget, false);
+        lastKey = key2;
+      }
 
       tSkipListIterNext(pCommitIter->pIter);
     } else {
@@ -1397,6 +1412,12 @@ static void tsdbLoadAndMergeFromCache(SDataCols *pDataCols, int *iter, SCommitIt
       ++(*iter);
       tSkipListIterNext(pCommitIter->pIter);
 #endif
+
+      if(lastKey != key1) {
+        lastKey = key1;
+        ++pTarget->numOfRows;
+      }
+
       // copy disk data
       for (int i = 0; i < pDataCols->numOfCols; ++i) {
         SCellVal sVal = {0};
@@ -1416,26 +1437,17 @@ static void tsdbLoadAndMergeFromCache(SDataCols *pDataCols, int *iter, SCommitIt
         }
 
         // 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, false);
-        } else {
-          tdAppendSTSRowToDataCol(row, pSchema, pTarget, false);
-        }
-        // TODO: merge with Multi-Version
-      } else {
-        ++pTarget->numOfRows;
-        ++(*iter);
-        tSkipListIterNext(pCommitIter->pIter);
+        tdAppendSTSRowToDataCol(row, pSchema, pTarget, true);
       }
+      ++(*iter);
+      tSkipListIterNext(pCommitIter->pIter);
     }
 
-    if (pTarget->numOfRows >= maxRows) break;
+    if (pTarget->numOfRows >= (maxRows - 1)) break;
+  }
+
+  if (lastKey != TSKEY_INITIAL_VAL) {
+    ++pTarget->numOfRows;
   }
 }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbMemTable.c b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
index 6520f371f6b83e7bc52ab837a3f7287f6c4df8b1..48d32c0dd3daf5a084c7205c603da479391c03e8 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMemTable.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
@@ -20,7 +20,7 @@ static void     tsdbFreeTbData(STbData *pTbData);
 static char    *tsdbGetTsTupleKey(const void *data);
 static int      tsdbTbDataComp(const void *arg1, const void *arg2);
 static char    *tsdbTbDataGetUid(const void *arg);
-static int      tsdbAppendTableRowToCols(STable *pTable, SDataCols *pCols, STSchema **ppSchema, STSRow *row);
+static int tsdbAppendTableRowToCols(STable *pTable, SDataCols *pCols, STSchema **ppSchema, STSRow *row, bool merge);
 
 int tsdbMemTableCreate(STsdb *pTsdb, STsdbMemTable **ppMemTable) {
   STsdbMemTable *pMemTable;
@@ -82,15 +82,19 @@ int tsdbLoadDataFromCache(STable *pTable, SSkipListIterator *pIter, TSKEY maxKey
                           TKEY *filterKeys, int nFilterKeys, bool keepDup, SMergeInfo *pMergeInfo) {
   ASSERT(maxRowsToRead > 0 && nFilterKeys >= 0);
   if (pIter == NULL) return 0;
-  STSchema  *pSchema = NULL;
-  TSKEY      rowKey = 0;
-  TSKEY      fKey = 0;
+  STSchema *pSchema = NULL;
+  TSKEY     rowKey = 0;
+  TSKEY     fKey = 0;
+  // only fetch lastKey from mem data as file data not used in this function actually
   TSKEY      lastKey = TSKEY_INITIAL_VAL;
   bool       isRowDel = false;
   int        filterIter = 0;
   STSRow    *row = NULL;
   SMergeInfo mInfo;
 
+  // TODO: support Multi-Version(the rows with the same TS keys in memory can't be merged if its version refered by
+  // query handle)
+
   if (pMergeInfo == NULL) pMergeInfo = &mInfo;
 
   memset(pMergeInfo, 0, sizeof(*pMergeInfo));
@@ -190,21 +194,66 @@ int tsdbLoadDataFromCache(STable *pTable, SSkipListIterator *pIter, TSKEY maxKey
       }
     }
 #endif
-    } else { // fkey >= rowKey
+#if 1
+    } else if (fKey > rowKey) {
       if (isRowDel) {
+        // TODO: support delete function
+        pMergeInfo->rowsDeleteFailed++;
+      } else {
+        if (pMergeInfo->rowsInserted - pMergeInfo->rowsDeleteSucceed >= maxRowsToRead) break;
+        if (pCols && pMergeInfo->nOperations >= pCols->maxPoints) break;
+
+        if (lastKey != rowKey) {
+          pMergeInfo->rowsInserted++;
+          pMergeInfo->nOperations++;
+          pMergeInfo->keyFirst = TMIN(pMergeInfo->keyFirst, rowKey);
+          pMergeInfo->keyLast = TMAX(pMergeInfo->keyLast, rowKey);
+          if (pCols) {
+            if (lastKey != TSKEY_INITIAL_VAL) {
+              ++pCols->numOfRows;
+            }
+            tsdbAppendTableRowToCols(pTable, pCols, &pSchema, row, false);
+          }
+          lastKey = rowKey;
+        } else {
+          if (keepDup) {
+            tsdbAppendTableRowToCols(pTable, pCols, &pSchema, row, true);
+          } else {
+            // discard
+          }
+        }
+      }
+
+      tSkipListIterNext(pIter);
+      row = tsdbNextIterRow(pIter);
+      if (row == NULL || TD_ROW_KEY(row) > maxKey) {
+        rowKey = INT64_MAX;
+        isRowDel = false;
+      } else {
+        rowKey = TD_ROW_KEY(row);
+        isRowDel = TD_ROW_IS_DELETED(row);
+      }
+    } else {           // fkey == rowKey
+      if (isRowDel) {  // TODO: support delete function(How to stands for delete in file? rowVersion = -1?)
         ASSERT(!keepDup);
         if (pCols && pMergeInfo->nOperations >= pCols->maxPoints) break;
         pMergeInfo->rowsDeleteSucceed++;
         pMergeInfo->nOperations++;
-        tsdbAppendTableRowToCols(pTable, pCols, &pSchema, row);
+        tsdbAppendTableRowToCols(pTable, pCols, &pSchema, row, false);
       } else {
         if (keepDup) {
           if (pCols && pMergeInfo->nOperations >= pCols->maxPoints) break;
-          pMergeInfo->rowsUpdated++;
-          pMergeInfo->nOperations++;
-          pMergeInfo->keyFirst = TMIN(pMergeInfo->keyFirst, rowKey);
-          pMergeInfo->keyLast = TMAX(pMergeInfo->keyLast, rowKey);
-          tsdbAppendTableRowToCols(pTable, pCols, &pSchema, row);
+          if (lastKey != rowKey) {
+            pMergeInfo->rowsUpdated++;
+            pMergeInfo->nOperations++;
+            pMergeInfo->keyFirst = TMIN(pMergeInfo->keyFirst, rowKey);
+            pMergeInfo->keyLast = TMAX(pMergeInfo->keyLast, rowKey);
+            lastKey = rowKey;
+            ++pCols->numOfRows;
+            tsdbAppendTableRowToCols(pTable, pCols, &pSchema, row, false);
+          } else {
+            tsdbAppendTableRowToCols(pTable, pCols, &pSchema, row, true);
+          }
         } else {
           pMergeInfo->keyFirst = TMIN(pMergeInfo->keyFirst, fKey);
           pMergeInfo->keyLast = TMAX(pMergeInfo->keyLast, fKey);
@@ -228,6 +277,10 @@ int tsdbLoadDataFromCache(STable *pTable, SSkipListIterator *pIter, TSKEY maxKey
         fKey = tdGetKey(filterKeys[filterIter]);
       }
     }
+#endif
+  }
+  if (lastKey != TSKEY_INITIAL_VAL) {
+    ++pCols->numOfRows;
   }
 
   return 0;
@@ -301,8 +354,8 @@ static STbData *tsdbNewTbData(tb_uid_t uid) {
   pTbData->pData = tSkipListCreate(5, TSDB_DATA_TYPE_TIMESTAMP, sizeof(int64_t), tkeyComparFn, SL_DISCARD_DUP_KEY,
                                    tsdbGetTsTupleKey);
 #endif
-  pTbData->pData = tSkipListCreate(5, TSDB_DATA_TYPE_TIMESTAMP, sizeof(int64_t), tkeyComparFn, SL_ALLOW_DUP_KEY,
-                                   tsdbGetTsTupleKey);
+  pTbData->pData =
+      tSkipListCreate(5, TSDB_DATA_TYPE_TIMESTAMP, sizeof(int64_t), tkeyComparFn, SL_ALLOW_DUP_KEY, tsdbGetTsTupleKey);
   if (pTbData->pData == NULL) {
     taosMemoryFree(pTbData);
     return NULL;
@@ -337,7 +390,7 @@ static char *tsdbTbDataGetUid(const void *arg) {
   STbData *pTbData = (STbData *)arg;
   return (char *)(&(pTbData->uid));
 }
-static int tsdbAppendTableRowToCols(STable *pTable, SDataCols *pCols, STSchema **ppSchema, STSRow *row) {
+static int tsdbAppendTableRowToCols(STable *pTable, SDataCols *pCols, STSchema **ppSchema, STSRow *row, bool merge) {
   if (pCols) {
     if (*ppSchema == NULL || schemaVersion(*ppSchema) != TD_ROW_SVER(row)) {
       *ppSchema = tsdbGetTableSchemaImpl(pTable, false, false, TD_ROW_SVER(row));
@@ -347,7 +400,7 @@ static int tsdbAppendTableRowToCols(STable *pTable, SDataCols *pCols, STSchema *
       }
     }
 
-    tdAppendSTSRowToDataCol(row, *ppSchema, pCols, false);
+    tdAppendSTSRowToDataCol(row, *ppSchema, pCols, merge);
   }
 
   return 0;
diff --git a/tests/script/tsim/query/scalarFunction.sim b/tests/script/tsim/query/scalarFunction.sim
index 97d49ae9012b2222d5c693766ad55380bb165ec2..2946a89ff654f9744b4cfe0f89240b542623ea94 100644
--- a/tests/script/tsim/query/scalarFunction.sim
+++ b/tests/script/tsim/query/scalarFunction.sim
@@ -102,6 +102,7 @@ print ====> $data60 $data61 $data62 $data63 $data64 $data65
 print ====> $data70 $data71 $data72 $data73 $data74 $data75
 print ====> $data80 $data81 $data82 $data83 $data84 $data85
 print ====> $data90 $data91 $data92 $data93 $data94 $data95
+print ====> rows = $rows and rowNum = $rowNum for ct1
 if $rows != $rowNum then
   return -1
 endi