Release arrow-rs / parquet Minor version `57.2.0` (December 2025)

[mbrobbel]

Let's keep the code flowing. Part of

• [EPIC] A collection of release tickets #7392

Release Checklist:

• Verify with downstream DataFusion tests: Upgrade DataFusion to arrow-rs/parquet 57.2.0 datafusion#19355
• Release notes and bump version: Update version to 57.2.0, add CHANGELOG #9103
• Release Candidate + Vote thread: https://lists.apache.org/thread/6wg53hcbh7oc7brk43kwoq6v93fmssfn
• Release to crates.io / approval:
• Create follow on tickets (see [EPIC] A collection of release tickets #7392)
• Update readme: docs: Update release schedule in README.md #9111

Required items for release

• Regression in struct casting in 57.2.0 (not yet released) #9005
• wrong results for null count of nullif kernel #9085
• Fix panic when decoding multiple Union columns in RowConverter #8999

Requested items for release

[alamb]

Update here is I am a bit behind. I intend to finalize the release content in the next day or two and then make an RC later this week and release it this weekend/early next week

[alamb]

I have looked at the list of PRs, and here is the only one I think is required:

• Seal Array trait #9092

I think the ones we should try to get these ones into the release

• feat(parquet): relax type compatility check in parquet ArrowWriter #9099
• Add Union encoding documentation  #9102