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https://issues.apache.org/jira/browse/BEAM-14107?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brian Hulette updated BEAM-14107:
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Description: We should be able to build a deferred operation that
calculates the number of groups for these operations. (was:
* len(GroupBy) and ngroups
** if groupers are all categorical _and_ observed=False or all boolean)
> DataFrame API: Support deferred GroupBy.__len__ and GroupBy.ngroups
> -------------------------------------------------------------------
>
> 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
>
> We should be able to build a deferred operation that calculates the number of
> groups for these operations.
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