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I’ve found that temporarily making array raises an exception is a way to easily figure out which methods are unnecessarily materializing the full array of objects.
I can add a more comprehensive set of benchmarks of .agg cython functions for categorical and object groupbys to the asv benchmarks if no one else is working on that already
we have a number of groupby benchmarks with categoricals, but I think we need a comprehensive set to exercise combinations of:
xref SO
groupby on cat/object columns
cython function (e.g.
first/max/....
).agg
variants of cython functionsso [3] should be as fast as [2], culprit is here
we could have multiple PRs to solve this issue (benchmark & perf fix)
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