define behavior of `transform_vec` and friends

JuliaData / JuliaDBMeta.jl

Metaprogramming tools for JuliaDB

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define behavior of `transform_vec` and friends #12

Open piever opened 6 years ago

piever commented 6 years ago

Decide which columnwise operations should accept an optional grouping argument. Also clarify what happens for the distributed case (use the groupby implementation for the case by == ()).

piever commented 6 years ago

Related to this, think how to handle "grouped data".

piever commented 6 years ago

Similarly, see if it's easy to implement usekey behavior generally when grouping.