Andy Ye created BEAM-14107:
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Summary: 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
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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