fix(query): add check for blockdata.

source/dnode/vnode/src/tsdb/tsdbRead.c

@@ -1157,6 +1157,8 @@ static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader, STableBlockScanIn
     setBlockAllDumped(pDumpInfo, ts, pReader->order);
   }
 
+  pBlockScanInfo->lastKey = pDumpInfo->lastKey;
+
   double elapsedTime = (taosGetTimestampUs() - st) / 1000.0;
   pReader->cost.blockLoadTime += elapsedTime;
 
@@ -2468,7 +2470,7 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
   while (1) {
     bool hasBlockData = false;
     {
-      while (pBlockData->nRow > 0) {  // find the first qualified row in data block
+      while (pBlockData->nRow > 0 && pBlockData->uid == pBlockScanInfo->uid) {  // find the first qualified row in data block
         if (isValidFileBlockRow(pBlockData, pDumpInfo, pBlockScanInfo, pReader)) {
           hasBlockData = true;
           break;
@@ -2478,10 +2480,13 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
 
         SDataBlk* pBlock = getCurrentBlock(&pReader->status.blockIter);
         if (pDumpInfo->rowIndex >= pBlock->nRow || pDumpInfo->rowIndex < 0) {
-          int32_t     nextIndex = -1;
           SBlockIndex bIndex = {0};
-          bool        hasNeighbor =
-              getNeighborBlockOfSameTable(pBlockInfo, pBlockScanInfo, &nextIndex, pReader->order, &bIndex);
+          int32_t     nextIndex = -1;
+          bool        hasNeighbor = false;
+          if (pBlockInfo != NULL) {
+            hasNeighbor = getNeighborBlockOfSameTable(pBlockInfo, pBlockScanInfo, &nextIndex, pReader->order, &bIndex);
+          }
+
           if (!hasNeighbor) {  // do nothing
             setBlockAllDumped(pDumpInfo, pBlock->maxKey.ts, pReader->order);
             break;
@@ -3021,7 +3026,12 @@ static int32_t buildBlockFromFiles(STsdbReader* pReader) {
         } else {
           if (pReader->status.pCurrentFileset->nSttF > 0) {
             // data blocks in current file are exhausted, let's try the next file now
-            tBlockDataReset(&pReader->status.fileBlockData);
+            SBlockData* pBlockData = &pReader->status.fileBlockData;
+            if (pBlockData->uid != 0) {
+              tBlockDataClear(pBlockData);
+            }
+
+            tBlockDataReset(pBlockData);
             resetDataBlockIterator(pBlockIter, pReader->order);
             goto _begin;
           } else {
@@ -3378,6 +3388,11 @@ int32_t doMergeRowsInFileBlocks(SBlockData* pBlockData, STableBlockScanInfo* pSc
 
       SFileDataBlockInfo* pFileBlockInfo = getCurrentBlockInfo(&pReader->status.blockIter);
       SDataBlk*           pCurrentBlock = getCurrentBlock(&pReader->status.blockIter);
+      if (pFileBlockInfo == NULL) {
+        st = CHECK_FILEBLOCK_QUIT;
+        break;
+      }
+
       checkForNeighborFileBlock(pReader, pScanInfo, pCurrentBlock, pFileBlockInfo, pMerger, key, &st);
       if (st == CHECK_FILEBLOCK_QUIT) {
         break;