fix TD-1931

src/tsdb/src/tsdbMemTable.c

@@ -322,6 +322,7 @@ int tsdbLoadDataFromCache(STable *pTable, SSkipListIterator *pIter, TSKEY maxKey
   memset(pMergeInfo, 0, sizeof(*pMergeInfo));
   pMergeInfo->keyFirst = INT64_MAX;
   pMergeInfo->keyLast = INT64_MIN;
+  if (pCols) tdResetDataCols(pCols);
 
   row = tsdbNextIterRow(pIter);
   if (row == NULL || dataRowKey(row) > maxKey) {

src/tsdb/src/tsdbRWHelper.c

@@ -1495,7 +1495,6 @@ static int tsdbProcessAppendCommit(SRWHelper *pHelper, SCommitIter *pCommitIter,
     ASSERT(pIdx->len > 0);
     SCompBlock *pCompBlock = blockAtIdx(pHelper, pIdx->numOfBlocks - 1);
     ASSERT(pCompBlock->last && pCompBlock->numOfRows < pCfg->minRowsPerFileBlock);
-    tdResetDataCols(pDataCols);
     tsdbLoadDataFromCache(pTable, pCommitIter->pIter, maxKey, defaultRowsInBlock - pCompBlock->numOfRows, pDataCols,
                           NULL, 0, pCfg->update, pMergeInfo);
 
@@ -1525,7 +1524,6 @@ static int tsdbProcessAppendCommit(SRWHelper *pHelper, SCommitIter *pCommitIter,
     }
   } else {
     ASSERT(!pHelper->hasOldLastBlock);
-    tdResetDataCols(pDataCols);
     tsdbLoadDataFromCache(pTable, pCommitIter->pIter, maxKey, defaultRowsInBlock, pDataCols, NULL, 0, pCfg->update, pMergeInfo);
     ASSERT(pMergeInfo->rowsInserted == pMergeInfo->nOperations && pMergeInfo->nOperations == pDataCols->numOfRows);
 
@@ -1571,7 +1569,6 @@ static int tsdbProcessMergeCommit(SRWHelper *pHelper, SCommitIter *pCommitIter,
 
   if ((!TSDB_IS_LAST_BLOCK(&oBlock)) && keyFirst < pCompBlock->keyFirst) {
     while (true) {
-      tdResetDataCols(pDataCols);
       tsdbLoadDataFromCache(pTable, pCommitIter->pIter, oBlock.keyFirst-1, defaultRowsInBlock, pDataCols, NULL, 0,
                             pCfg->update, pMergeInfo);
       ASSERT(pMergeInfo->rowsInserted == pMergeInfo->nOperations && pMergeInfo->nOperations == pDataCols->numOfRows);