QuakeWang opened a new pull request, #472:
URL: https://github.com/apache/paimon-rust/pull/472
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### Purpose
<!-- Linking this pull request to the issue -->
BTree global index already supports explicit creation, but there was no
matching drop API. Once a BTree index exists, users could not remove its index
manifest entries through the table/DataFusion API, which also made safe rebuild
flows awkward because create rejects overlapping existing global index ranges.
<!-- 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 a BTree global index drop builder on `Table`.
- Drop matching current-snapshot index manifest entries via
`CommitMessage.deleted_index_files`.
- Keep the operation idempotent: no snapshot, no index manifest, or no
matching BTree index returns success with zero dropped entries.
- Add `CALL sys.drop_global_index(table => '...', index_column => '...',
index_type => 'btree')`.
- Reject non-BTree index types and unsupported `partitions` / `dry_run`
arguments explicitly.
### Tests
<!-- List unit tests or integration cases to verify this change -->
- `cargo fmt --all -- --check`
- `cargo clippy --all-targets --workspace --features fulltext,vortex,mosaic
-- -D warnings`
- `cargo test -p paimon table::btree_global_index_drop_builder --lib`
- `cargo test -p paimon-datafusion --test procedures drop_global_index`
- `cargo test -p paimon-datafusion --test procedures create_global_index`
- `cargo test -p paimon table::btree_global_index_build_builder --lib`
- `cargo check -p paimon`
- `cargo check -p paimon-datafusion`
### API and Format
<!-- Does this change affect API or storage format -->
Adds a Rust table API and DataFusion procedure for BTree global index drop.
### Documentation
<!-- Does this change introduce a new feature or require documentation
updates -->
No docs update in this PR; this only exposes the narrow BTree drop lifecycle
already represented by index manifest delete commits.
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