Feature: aggregations using custom user-defined functions #569
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…tside the scope of vaex).
maartenbreddels
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This PR starts the work on enabling the use of custom, user defined functions (outside the scope of vaex) for doing aggregations.
I would also like to start a discussion regarding the support of aggregations using functions that require multiple columns (or expressions) as arguments, for example
df.x + df.ycalculated for each group. We also might want to extend this to include custom functions outside the scope of vaex.I guess such functions might take up memory, but can perhaps still be lazily evaluated?