shyjsarah opened a new pull request, #482:
URL: https://github.com/apache/paimon-rust/pull/482
## Summary
Add read-only DataFusion support for Java-compatible Paimon branch
references such as `table$branch_b1` and `table$branch_b1$snapshots`.
## Changes
- Parse Paimon object names into base table, optional branch, and optional
system table components.
- Add branch-aware table copies and make scans, time travel, and system
tables use branch-aware snapshot/tag managers.
- Route DataFusion table and system-table lookup through branch-aware
loading.
- Reject write operations against non-main branch references.
- Document branch reference reads and read-only behavior.
## Testing
- `cargo fmt --all`
- `git diff --check`
- With the current upstream `BTREE_INDEX_TYPE` compile issue temporarily
patched locally:
- `cargo check -p paimon-datafusion --lib`
- `cargo test -p paimon catalog::tests --lib`
- `cargo test -p paimon-datafusion
system_tables::tests::branch_reference_does_not_drop_branch_name --lib`
- `cargo test -p paimon-datafusion --test sql_context_tests
test_select_branch_table_reads_branch_snapshot`
## Notes
This changes the public Rust API by adding branch helpers on `Table` and
object-name parsing helpers under `paimon::catalog`.
Running `cargo check -p paimon-datafusion --lib` on unmodified upstream
`main` currently fails before this change due to unresolved `BTREE_INDEX_TYPE`
references in `btree_global_index_build_builder.rs`. This PR intentionally does
not include that unrelated fix.
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