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Add DataFrame.partition_by/2 - #1163
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Splits a dataframe into one dataframe per distinct combination of the given columns, in the order each combination first appears, through Polars' partition_by. Lazy dataframes are collected first.
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Thank for another great contribution! I should have some bandwidth to review this next week and merge it in! |
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Sure, np. I needed this piece for https://github.com/georgeguimaraes/soothsayer and thought it would be a good one to contribute |
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One dataframe per distinct combination of the given columns, in the order each combination first appears, backed by Polars'
partition_by. Every piece keeps all the columns and a lazy frame is collected first.Fitting one model per time series in a frame, or one per store or sensor, needs exactly this split, and the alternative today is
distinctfollowed by onefilter_withper key, which reads the frame once per group.