XiaoHongbo-Hope opened a new pull request, #8722:
URL: https://github.com/apache/paimon/pull/8722

    ### Purpose
   
     `BlobFormatWriter` copies BLOB payloads using a hard-coded 4 KiB  buffer 
(`new byte[4096]`), which cannot be tuned.
   
     This PR adds a new option `blob.copy-buffer-size` to make it configurable, 
and threads it through all `BlobFormatWriter` construction paths (append / 
primary-key writes and BLOB compaction). The default stays **4 KiB**, so 
behavior is unchanged unless the option is set. Existing public constructors 
are preserved and delegate to the default (API-compatible).
   
     ### Tests
   
     - `BlobFormatWriterTest#testCopyBufferSizeIsRespectedForBlobRef`
     - `BlobFormatWriterTest#testDefaultCopyBufferSize`


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