TheNeuralBit commented on a change in pull request #15019:
URL: https://github.com/apache/beam/pull/15019#discussion_r654719294
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File path: sdks/python/apache_beam/dataframe/frames.py
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@@ -3187,6 +3187,13 @@ def __init__(self, expr, kwargs,
self._grouping_indexes = grouping_indexes
self._kwargs = kwargs
+ if (self._kwargs.get('dropna', True) is False and
+ self._ungrouped.proxy().index.nlevels > 1):
+ raise NotImplementedError(
+ "dropna=False does not work as intended in the Beam DataFrame API "
+ "when grouping on multiple columns or indexes (See BEAM-12495).")
Review comment:
I think that might be confusing since the upstream bug is _just_ when
grouping by index levels, but our users will encounter it even when grouping
on columns since we move columns to the index.
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