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Weston Pace commented on ARROW-15635: ------------------------------------- Thanks, this is helpful. This might be interesting to [~jorisvandenbossche][~amol-] as well. > [C++][Python] UDF Integration > ------------------------------ > > Key: ARROW-15635 > URL: https://issues.apache.org/jira/browse/ARROW-15635 > Project: Apache Arrow > Issue Type: Task > Components: C++, Python > Reporter: Vibhatha Lakmal Abeykoon > Assignee: Vibhatha Lakmal Abeykoon > Priority: Major > > The objective is to list down a set of tasks required to provide UDF support > for Apache Arrow streaming execution engine. In the first iteration we will > be focusing on providing support for Python-based UDFs which can support > Python functions. > The UDF Integration is going to pan out with a series of sub-tasks associated > with the development and PoCs. Note that this is going to be the first > iteration of UDF integrations with a limited scope. This ticket will cover > the following topics; > # POC for UDF integration: The objective is to evaluate the existing > components in the source and evaluate the required modifications and new > building blocks required to integrate UDFs. > # The language will be limited to C+{+}/{+}Python users can register Python > function as a UDF and use it with an `apply` method on Arrow Tables or > provide a computation API endpoint via arrow::compute API. Note that the C+ > API already provides a way to register custom functions via the function > registry API. At the moment this is not exposed to Python. > # Planned features for this ticket are; > ## Scalar UDFs : UDFs executed per value (per row) > ## Vector UDFs : UDFs executed per batch (a full array or partial array) > ## Aggregate UDFs : UDFs associated with an aggregation operation > # Integration limitations > ## Doesn't support custom data types which doesn't support Numpy or Pandas > ## Complex processing with parallelism within UDFs are not supported > ## Parallel UDFs are not supported in the initial version of UDFs. Allthough > we are documenting what is required and a rough sketch for the next phase. -- This message was sent by Atlassian Jira (v8.20.1#820001)