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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/09/13 16:50:02 UTC
[GitHub] [arrow] jorgecarleitao opened a new pull request #8180: ARROW-9752: [Rust] [DataFusion] Add support for User-Defined Aggregate Functions.
jorgecarleitao opened a new pull request #8180:
URL: https://github.com/apache/arrow/pull/8180
This PR is a proposal to support User-Defined Aggregate Functions (UDAF).
For now, the only thing that is worth going through is the example at rust/datafusion/examples/simple_udaf.rs, that shows how users would declare and use a UDAF to compute the geometric mean (it works).
This implementation is built on top of #8172 , so, there is some time for discussions :). The stats on github are due to the other PRs. This PR is +426 -0 without tests.
The proposed API follows the same principles of our API for creating UDFs: we offer a simple API to declare a single-typed UDAF, but we allow users the same flexibility that DataFusion internally has. This example uses the simple API, where users need to
1. declare a struct that implements `Accumulator` (declare 4 functions and some state)
2. create a UDAF that contains the UDAF's signature (1 function call)
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[GitHub] [arrow] andygrove closed pull request #8180: ARROW-9752: [Rust] [DataFusion] Add support for User-Defined Aggregate Functions.
Posted by GitBox <gi...@apache.org>.
andygrove closed pull request #8180:
URL: https://github.com/apache/arrow/pull/8180
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[GitHub] [arrow] github-actions[bot] commented on pull request #8180: ARROW-9752: [Rust] [DataFusion] Add support for User-Defined Aggregate Functions.
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on pull request #8180:
URL: https://github.com/apache/arrow/pull/8180#issuecomment-691697180
https://issues.apache.org/jira/browse/ARROW-9752
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