diff --git a/include/common/trow.h b/include/common/trow.h
index 963542fb31..862df43fc2 100644
--- a/include/common/trow.h
+++ b/include/common/trow.h
@@ -651,6 +651,8 @@ static int32_t tdSRowResetBuf(SRowBuilder *pBuilder, void *pBuf) {
   TD_ROW_SET_INFO(pBuilder->pBuf, 0);
   TD_ROW_SET_TYPE(pBuilder->pBuf, pBuilder->rowType);
 
+  TASSERT(pBuilder->nBitmaps > 0 && pBuilder->flen > 0);
+
   uint32_t len = 0;
   switch (pBuilder->rowType) {
     case TD_ROW_TP:
@@ -1165,6 +1167,18 @@ static FORCE_INLINE int32_t tdGetColDataOfRow(SCellVal *pVal, SDataCol *pCol, in
   return TSDB_CODE_SUCCESS;
 }
 
+/**
+ * @brief 
+ * 
+ * @param pRow 
+ * @param colId 
+ * @param colType 
+ * @param flen 
+ * @param offset 
+ * @param colIdx start from 0
+ * @param pVal 
+ * @return FORCE_INLINE 
+ */
 static FORCE_INLINE bool tdSTpRowGetVal(STSRow *pRow, col_id_t colId, col_type_t colType, int32_t flen, uint32_t offset,
                                         col_id_t colIdx, SCellVal *pVal) {
   if (colId == PRIMARYKEY_TIMESTAMP_COL_ID) {
@@ -1172,10 +1186,20 @@ static FORCE_INLINE bool tdSTpRowGetVal(STSRow *pRow, col_id_t colId, col_type_t
     return true;
   }
   void *pBitmap = tdGetBitmapAddrTp(pRow, flen);
-  tdGetTpRowValOfCol(pVal, pRow, pBitmap, colType, offset - sizeof(TSKEY), colIdx - 1);
+  tdGetTpRowValOfCol(pVal, pRow, pBitmap, colType, offset - sizeof(TSKEY), colIdx);
   return true;
 }
 
+/**
+ * @brief 
+ * 
+ * @param pRow 
+ * @param colId 
+ * @param offset 
+ * @param colIdx start from 0
+ * @param pVal 
+ * @return FORCE_INLINE 
+ */
 static FORCE_INLINE bool tdSKvRowGetVal(STSRow *pRow, col_id_t colId, uint32_t offset, col_id_t colIdx,
                                         SCellVal *pVal) {
   if (colId == PRIMARYKEY_TIMESTAMP_COL_ID) {
@@ -1183,7 +1207,7 @@ static FORCE_INLINE bool tdSKvRowGetVal(STSRow *pRow, col_id_t colId, uint32_t o
     return true;
   }
   void *pBitmap = tdGetBitmapAddrKv(pRow, tdRowGetNCols(pRow));
-  tdGetKvRowValOfCol(pVal, pRow, pBitmap, offset, colIdx - 1);
+  tdGetKvRowValOfCol(pVal, pRow, pBitmap, offset, colIdx);
   return true;
 }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 2ad34d1561..4686d97ec8 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -1561,12 +1561,19 @@ static void mergeTwoRowFromMem(STsdbReadHandle* pTsdbReadHandle, int32_t capacit
     if (isChosenRowDataRow) {
       colId = pSchema->columns[chosen_itr].colId;
       offset = pSchema->columns[chosen_itr].offset;
-      tdSTpRowGetVal(row, colId, pSchema->columns[chosen_itr].type, pSchema->flen, offset, chosen_itr, &sVal);
+      // TODO: use STSRowIter
+      tdSTpRowGetVal(row, colId, pSchema->columns[chosen_itr].type, pSchema->flen, offset, chosen_itr - 1, &sVal);
     } else {
-      SKvRowIdx* pColIdx = tdKvRowColIdxAt(row, chosen_itr);
-      colId = pColIdx->colId;
-      offset = pColIdx->offset;
-      tdSKvRowGetVal(row, colId, offset, chosen_itr, &sVal);
+      // TODO: use STSRowIter
+      if (chosen_itr == 0) {
+        colId = PRIMARYKEY_TIMESTAMP_COL_ID;
+        tdSKvRowGetVal(row, PRIMARYKEY_TIMESTAMP_COL_ID, -1, -1, &sVal);
+      } else {
+        SKvRowIdx* pColIdx = tdKvRowColIdxAt(row, chosen_itr - 1);
+        colId = pColIdx->colId;
+        offset = pColIdx->offset;
+        tdSKvRowGetVal(row, colId, offset, chosen_itr - 1, &sVal);
+      }
     }
 
     if (colId == pColInfo->info.colId) {