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Dhruv Vats edited comment on ARROW-15152 at 2/18/22, 5:47 PM: -------------------------------------------------------------- Is it something like: ||Arg||Key|| |Yo|1| |Hello|2| |Howdy|2| |Wassup|1| |Yolo|3| When {{hash_list}} is applied as aggregate to group by {{{}Key{}}}, the above table becomes: ||hash_list(Arg)||Key|| |[Yo, Wassup]|1| |[Hello, Howdy]|2| |[Yolo]|3| ? was (Author: dhruv9vats): Is it something like: ||Arg||Key|| |Yo|1| |Hello|2| |Howdy|2| |Wassup|1| |Yolo|3| When {{hash_list}} is applied as aggregate to group by {{Key, }}the above{{ table}} becomes: ||hash_list(Arg)||Key|| |[Yo, Wassup]|1| |[Hello, Howdy]|2| |[Yolo]|3| ? > Implement a `hash_list` aggregate function. > ------------------------------------------- > > Key: ARROW-15152 > URL: https://issues.apache.org/jira/browse/ARROW-15152 > Project: Apache Arrow > Issue Type: New Feature > Components: C++, Python > Affects Versions: 6.0.1 > Reporter: A. Coady > Assignee: Dhruv Vats > Priority: Major > Labels: good-second-issue, kernel > > For more advanced aggregations, it's helpful to be able to gather the grouped > values into a list array. Pandas and Polars both have that feature. And > `hash_distinct` already aggregates to lists, so all the building blocks are > there. -- This message was sent by Atlassian Jira (v8.20.1#820001)