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## What changes were proposed in this pull request? These builtin typed aggregate functions are not very useful: 1. users can just call the untyped ones and turn the resulting dataframe to a dataset. It has better performance. 2. the typed aggregate functions have subtle different behaviors regarding empty input. I think we should get rid of these builtin typed agg functions and suggest users to use the untyped ones. However, these functions are still useful as a demo of the `Aggregator` API, so I copied them to the example module. ## How was this patch tested? N/A Closes #23763 from cloud-fan/example. Authored-by: Wenchen Fan <wenchen@databricks.com> Signed-off-by: gatorsmile <gatorsmile@gmail.com> |
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