How do you insert a map-reduce into a Polars method chain?

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Peter Schneider
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How do you insert a map-reduce into a Polars method chain?
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(stackoverflow.com/users/122792/thomas-browne)Thomas Browne
(stackoverflow.com/users/1744834/roman)roman
(stackoverflow.com/users/19355181/jqurious)jqurious
A special thanks goes out to the (stackoverflow.com/questions/79302825/how-do-you-insert-a-map-reduce-into-a-polars-method-chain)Stackexchange community

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