thswlsqls opened a new pull request, #8689:
URL: https://github.com/apache/paimon/pull/8689

   
   ### Purpose
   
   fix #8687
   
   - `VFSInputStream.read()` delegates to `read(oneByteBuf, 0, 1)`, which 
already calls `statistics.incrementBytesRead(...)`, then incremented again — so 
each single-byte read counted 2 bytes.
   - This inflated `FileSystem.Statistics.bytesRead` (the Spark/MapReduce 
"Bytes Read" counter).
   - Removed the redundant increment so single-byte reads count once, matching 
the bulk `read(byte[], int, int)` and pread paths in the same class.
   
   ### Tests
   
   - Added `VFSInputStreamTest#testSingleByteReadCountsBytesOnce` (regression 
guard: `getBytesRead() == N`, previously `2N`), `#testBulkReadCountsBytesOnce`, 
and `#testReadAtEofDoesNotCount`.
   - `mvn -pl paimon-vfs/paimon-vfs-hadoop -DfailIfNoTests=false clean install` 
— 27 tests passed (JDK 11, no engine profile).
   


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