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Smarter default for split_out in groupby aggregations #867

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hendrikmakait opened this issue Feb 12, 2024 · 0 comments
Open

Smarter default for split_out in groupby aggregations #867

hendrikmakait opened this issue Feb 12, 2024 · 0 comments
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enhancement New feature or request

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@hendrikmakait
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Currently, the default for split_out is based on the number of partitions and groupby columns:

https://github.com/dask-contrib/dask-expr/blob/fdeee4375df55499462bc35af50d3d216d5e256c/dask_expr/_groupby.py#L81-L82

Ideally, this would take (an estimate of) the number of unique groups into account to avoid situations like coiled/benchmarks#1376.
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@hendrikmakait