Hash aggregates, aggregate expressions

CI/CD, GitHub Actions, build tooling

Expression evaluation

Arrow FFI / JNI boundary

Join operators and dynamic filter pushdown

Memory pools, reservations, OOM handling

Parquet scan / data reading

Shuffle (JVM and native)

Native Parquet writer

Something isn't working

Build environment

Native engine crash/panic/segfault

Pull requests that update a dependency file

Any issue related to DF & Spark compatibility

Improvements or additions to documentation

This issue or pull request already exists

New feature or request

Spark expression related

Good for newcomers

Extra attention is needed

This doesn't seem right

Pull requests that update Java code