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https://issues.apache.org/jira/browse/BEAM-14107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17511485#comment-17511485
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Brian Hulette commented on BEAM-14107:
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There are really two separate issues - I broke out BEAM-14162 for the Grouper
object issue.
> DataFrame API: Refactor GroupBy
> -------------------------------
>
> Key: BEAM-14107
> URL: https://issues.apache.org/jira/browse/BEAM-14107
> Project: Beam
> Issue Type: Improvement
> Components: dsl-dataframe, sdk-py-core
> Reporter: Andy Ye
> Priority: P3
> Labels: dataframe-api
>
> Implement GroupBy in a different way, to support deferred operations. We'd
> like to support
> * Grouper objects
> * len(GroupBy) and ngroups
> ** if groupers are all categorical _and_ observed=False or all boolean
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