QuakeWang opened a new pull request, #317:
URL: https://github.com/apache/paimon-rust/pull/317
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### Purpose
<!-- Linking this pull request to the issue -->
Linked issue: follow-up to #256
This PR adds basic `merge-engine=partial-update` support for primary-key
tables using `bucket=-1` dynamic bucket mode.
It extends the existing fixed-bucket partial-update support to
non-cross-partition dynamic bucket tables, including partitioned tables whose
primary keys include partition fields. Cross-partition dynamic bucket
partial-update remains unsupported and fails fast.
<!-- What is the purpose of the change -->
### Brief change log
<!-- Please describe the changes made in this pull request and explain how
they address the issue -->
- Allow `merge-engine=partial-update` for non-cross-partition `bucket=-1`
PK tables.
- Restore existing HASH index entries before assigning buckets, so updates
to existing keys stay in their original buckets.
- Keep `merge-engine=partial-update` with cross-partition dynamic bucket
explicitly unsupported.
- Reject partition-only primary keys, which would leave only one record
per partition.
- Add DataFusion integration tests for unpartitioned, partitioned, and
existing-key dynamic bucket partial-update cases.
### Tests
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### API and Format
<!-- Does this change affect API or storage format -->
This PR uses the existing dynamic bucket HASH index format and does not
introduce a new storage format.
### Documentation
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updates -->
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