Apache Gluten - Hackathon at Community over Code Glasgow 2026

Apache Community over Code 2026 - Glasgow, UK, October 11-14

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Apache Gluten - Hackathon

This page is focused on Velox backend and common runtime/config tasks. ClickHouse-specific tasks are intentionally excluded.

We’re focusing on:

Good first issues that can be completed during the hackathon
Docs and test alignment where support tables lag behind real code/test coverage
Small Velox/Common code improvements with clear scope and acceptance criteria

The items below are curated examples. Participants are also welcome to pick other suitable tasks from the Gluten good first issues.

Issue: #10275 - document unsupported cases for complicated functions
Focus: add clear SQL examples for JSON/regex/base64 limitations, and align the support matrix with current Velox test behavior (for example: sequence, map_from_arrays, to_date, to_timestamp, ln, radians, sin, try_divide).
Output: one concise docs PR (optional: add minimal validation tests).

Issue: #9184 - integration tests for S3/HDFS/GCS/ABFS
Focus: implement one backend-focused test improvement, with a practical split such as #9619 - HDFS or #9620 - ABFS.
Output: one backend-focused test improvement, or an ABFS feasibility note with reproducible findings.

Issue: #10134 - ANSI mode support tracker
Focus: pick one small sub-area (cast, arithmetic, datetime, or validation tests).
Output: one focused Velox PR and one focused Gluten PR for the selected ANSI sub-area, with test coverage.

Issue: #11622 - [VL] Support TIMESTAMP_NTZ Type
Focus: pick one small sub-area (cast behavior, function validation, or fallback/compatibility tests).
Output: one focused Velox PR and one focused Gluten PR that improve TIMESTAMP_NTZ support coverage.

Issue: #8984 - fix corner cases for casting varchar to timestamp
Focus: align CAST(varchar AS timestamp) corner-case behavior with Spark and add regression coverage.
Output: one focused Velox PR and one focused Gluten PR with validation tests.

To make the most of hackathon time, we recommend: