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`groupby` derived columns #392

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nilshg opened this issue Mar 22, 2024 · 0 comments

nilshg commented Mar 22, 2024

Related to #383 it would be nice to be able to group by the result of functions applied to columns. The most common case for me is:

df.year = year.(df.date)
groupby(df, :year)

It would be nice to just do

@groupby df :date => year

(Syntax TBD of course)

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