REF: Groupby._get_cythonized_result operate blockwise in axis==1 case (#43435)

jbrockmendel · AlexeyGy · commit aff7b84fb148 · 2021-09-13T16:37:04.000Z
diff --git a/doc/source/whatsnew/v1.3.4.rst b/doc/source/whatsnew/v1.3.4.rst
@@ -23,7 +23,8 @@ Fixed regressions
 
 Bug fixes
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-- Fixed bug in :meth:`.GroupBy.mean` with datetimelike values including ``NaT`` values returning incorrect results (:issue`:43132`)
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