rig-ballista

Apache Ballista + DataFusion + Iceberg companion crate for rig-compose.

Status: scaffolding. The implementation is gated on verifying the iceberg-rust + datafusion-iceberg + ballista combination compiles on a recent stable Rust toolchain. The crate is published early so downstream consumers can pin a version and depend on the planned MetadataCatalog trait once it lands.

Why a separate crate

• MSRV isolation. iceberg-rust 0.9 requires rustc 1.92; pinning that into rig-compose would force every consumer onto the same toolchain.
• Compile-cost isolation. Ballista pulls in DataFusion, Arrow, gRPC, Parquet — none of which the kernel needs.
• Boundary discipline. Ballista is a query-engine boundary, not a file-format boundary. Keeping it behind a trait keeps the skill/tool surface clean.

Rust version

The crate targets Rust 1.88 (edition 2024) for the placeholder surface. The eventual integration will track the Iceberg/Ballista toolchain floor and ship as a feat!: MSRV bump.

License

Dual-licensed under either of:

• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)
• Apache License, Version 2.0 (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual-licensed as above, without any additional terms or conditions.