[PR] fix(python): handle partial stream writes [paimon-mosaic]

["jianguotian (via GitHub)" <gi...@apache.org>]

jianguotian opened a new pull request, #94:
URL: https://github.com/apache/paimon-mosaic/pull/94

   ## Purpose
   
   The Python writer callback treated every `stream.write()` call as a complete write. File-like objects are allowed to return a smaller positive byte count, `0`, or `None`, so the adapter could report success after writing only part of a Mosaic file.
   
   ## Changes
   
   - retry positive partial writes until the full callback buffer is written;
   - fail on `0`, `None`, invalid, or oversized write results;
   - advance the logical position only after the complete buffer is written;
   - cover full writes, repeated short writes, and stalled writes.
   
   ## Validation
   
   - Python test suite: 64 passed
   - Rust interop fixtures: 7 passed
   - Python `compileall`: passed
   - real nonblocking `io.FileIO` pipe: partial output now returns an explicit write failure instead of success
   - `git diff --check`: passed
   


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Re: [PR] fix(python): handle partial stream writes [paimon-mosaic]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi merged PR #94:
URL: https://github.com/apache/paimon-mosaic/pull/94


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