jackylee-ch opened a new pull request, #15879:
URL: https://github.com/apache/iceberg/pull/15879
## Summary
- Fix NPE in `ParquetWriteAdapter.length()` and `splitOffsets()` when
called after `close()` by caching data size and reusing cached footer before
nullifying the internal writer
- Add regression tests verifying the `FileAppender` post-close contract
for the deprecated adapter
- Clean up the pre-close `length()` workaround in
`ParquetWritingTestUtils` that was needed because of this bug
Fixes #14310
## Test Plan
- [x] `TestParquetWriteAdapter.postCloseAccessors` — verifies `length()`,
`metrics()`, `splitOffsets()` work after close
- [x] `TestParquetWriteAdapter.dataWriterCloseWithDeprecatedAdapter` —
end-to-end `DataWriter.close()` path
- [x] Full `:iceberg-parquet:test` suite — 642 tests pass, 0 failures
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