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  1. Beam
  2. BEAM-14107

DataFrame API: Support deferred GroupBy.__len__ and GroupBy.ngroups

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      We should be able to build a deferred operation that calculates the number of groups for GroupBy.ngroups.

      len(groupby) might be possible ... but I think python will complain if we return something other than an integer (like a deferred operation). If thats the case we should raise an error that directs users to alternatives (e.g. ngroups).

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          is a child of

          Improvement - An improvement or enhancement to an existing feature or task. BEAM-12133 Tracking: DataFrame API future enhancements

          • P4 - Trivial items, spelling errors, etc.
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          is a parent of

          Sub-task - The sub-task of the issue BEAM-13968 Implement len(GroupBy) and ngroups for DataFrame API

          • P3 - Non-urgent bugs, features, and improvements
          • Open
          is duplicated by

          Sub-task - The sub-task of the issue BEAM-14106 DataFrame API: Refactor GroupBy

          • P2 - Default priority. Will be triaged and planned according to community practices.
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              Unassigned Unassigned
              yeandy Andy Ye
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