QuakeWang opened a new pull request, #372:
URL: https://github.com/apache/paimon-rust/pull/372
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### Purpose
<!-- Linking this pull request to the issue -->
Linked issue: Part of #232
`DataEvolutionWriter` was exposed as a lower-level writer and DataFusion DML
created it directly, while `WriteBuilder` only covered write and commit
construction. This made the table-level write API incomplete and kept UPDATE /
MERGE INTO data-evolution paths outside the builder flow.
This PR introduces `TableUpdate` as the table-level update API and wires
data-evolution UPDATE / MERGE INTO through `WriteBuilder::new_update(...)`.
<!-- 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 -->
- Add public `TableUpdate` as a thin wrapper around `DataEvolutionWriter`.
- Add `WriteBuilder::new_update(update_columns)`.
- Export `TableUpdate` from `paimon::table` and crate root.
- Update DataFusion data-evolution UPDATE / MERGE INTO to create update
writers through `WriteBuilder`.
- Reuse one `WriteBuilder` for MERGE INTO update writer, insert writer,
and commit.
### Tests
<!-- List unit tests or integration cases to verify this change -->
- `cargo fmt --all -- --check`
- `cargo clippy -p paimon -p paimon-datafusion --all-targets --features
fulltext,vortex -- -D warnings`
- `cargo test -p paimon table::write_builder`
- `cargo test -p paimon table::data_evolution_writer`
- `cargo test -p paimon-datafusion --test update_tests`
- `cargo test -p paimon-datafusion --test merge_into_tests`
### API and Format
<!-- Does this change affect API or storage format -->
Adds public `TableUpdate` and `WriteBuilder::new_update(...)`.
### Documentation
<!-- Does this change introduce a new feature or require documentation
updates -->
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