Re: [D] Q2 2026 roadmap planning [datafusion]

["adp2201 (via GitHub)" <gi...@apache.org>]

GitHub user adp2201 closed a discussion: Q2 2026 roadmap planning

## Q2 2026 roadmap planning

Hi all,

Q2 is coming up, so it seems like a good time to start a fresh roadmap discussion building on the Q1 thread:
- Q1 roadmap: https://github.com/apache/datafusion/issues/18494

The goals here are simple:

1. Identify what should carry forward from Q1 into Q2
2. Identify what new projects we think should be prioritized in Q2

## Likely carry-forward themes

From the Q1 discussion, these seem like the clearest themes to continue:

- **Performance**
  - ClickBench / Parquet leaderboard
  - Parquet pushdown / late materialization
  - planning speed
  - sort / join / spilling improvements

- **Developer experience / coordination**
  - CI reliability
  - contributor workflow
  - better coordination across active efforts

- **Extensibility / SQL surface**
  - extension types / UDTs
  - `VARIANT`
  - lambda syntax / array functionality
  - async UDF / UDTF work
  - datetime / timezone improvements

## Some concrete Q2 candidates

A few open epics / proposal epics that seem especially relevant:

- **Improve query planning speed**: #19795
- **ClickBench Parquet leaderboard**: #18489
- **Improve NUMA-awareness**: #20902
- **Sort-merge join execution improvements**: #20910
- **Support `VARIANT`**: #16116
- **Support Extension Types / UDTs**: #12644
- **Improve developer / CI speed**: #13813
- **Dynamic filtering**: #15512
- **Statistics improvements**: #8227

## Questions

- Which Q1 themes should clearly carry into Q2?
- Which open epics feel most important right now?
- What important Q2 projects are missing?
- Which efforts need more implementation help, benchmarking, or design work?

If you already plan to work on something in Q2, please comment with the issue / epic and the kind of help you’d welcome from others.

GitHub link: https://github.com/apache/datafusion/discussions/21017

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