fix: direct return file block only rows <= capacity

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

@@ -2432,7 +2432,8 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
     TSDBKEY   keyInBuf = getCurrentKeyInBuf(pBlockScanInfo, pReader);
 
     // it is a clean block, load it directly
-    if (isCleanFileDataBlock(pReader, pBlockInfo, pBlock, pBlockScanInfo, keyInBuf, pLastBlockReader)) {
+    if (isCleanFileDataBlock(pReader, pBlockInfo, pBlock, pBlockScanInfo, keyInBuf, pLastBlockReader) && 
+        pBlock->nRow <= pReader->capacity) {
       if (asc || ((!asc) && (!hasDataInLastBlock(pLastBlockReader)))) {
         copyBlockDataToSDataBlock(pReader, pBlockScanInfo);
 
@@ -2801,14 +2802,7 @@ static int32_t doBuildDataBlock(STsdbReader* pReader) {
     ASSERT(pBlockIter->numOfBlocks == 0);
     code = buildComposedDataBlock(pReader);
   } else if (fileBlockShouldLoad(pReader, pBlockInfo, pBlock, pScanInfo, keyInBuf, pLastBlockReader)) {
-    if (isCleanFileDataBlock(pReader, pBlockInfo, pBlock, pScanInfo, keyInBuf, pLastBlockReader) &&
-        bufferDataInFileBlockGap(pReader->order, keyInBuf, pBlock)) {
-      //load only caused by outputbuf is not enough to hold all rows and buf data is in file block gap 
-      int64_t endKey = (ASCENDING_TRAVERSE(pReader->order)) ? pBlock->minKey.ts : pBlock->maxKey.ts;
-      code = buildDataBlockFromBuf(pReader, pScanInfo, endKey);
-    } else {
-      code = doLoadFileBlockData(pReader, pBlockIter, &pStatus->fileBlockData, pScanInfo->uid);
-    }
+    code = doLoadFileBlockData(pReader, pBlockIter, &pStatus->fileBlockData, pScanInfo->uid);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
     }