[WIP] Add custom groupby-aggregation to Dask cuDF #17009
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rjzamora
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…nto custom-groupby-dask-cudf
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Description
The legacy Dask cuDF implementation uses a custom code path for GroupBy aggregations. However, when query-planning is enabled (the default), we use the same algorithm as the pandas backend. This PR ports the custom "fused aggregation" code path over to the dask-expr version of Dask cuDF.
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