[C++][Python] Implement HashAggregate UDF
- Dominant language
- C++
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Description
Implementing hash-aggregate user-defined functions and use these functions with `group_by`/ `agg` operations.
**Reporter**: [Vibhatha Lakmal Abeykoon](https://issues.apache.org/jira/browse/ARROW-18279) / @vibhatha
**Assignee**: [Vibhatha Lakmal Abeykoon](https://issues.apache.org/jira/browse/ARROW-18279) / @vibhatha
**Note**: *This issue was originally created as [ARROW-18279](https://issues.apache.org/jira/browse/ARROW-18279). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*
Contributor guide
Research direction
Start by reading the group_by and agg entry points and how they expose user-defined functions. The work is done when hash-aggregate UDFs are implemented and usable through both group_by and agg operations in C++ and Python.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, python
- Domain
- data
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100