Add test for named period index, doing group by index#33101

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sumanau7 wants to merge 3 commits intopandas-dev:masterfrom

sumanau7:BUG-32108

Commits on Mar 28, 2020

Add test for named period index, doing group by index
Sumanau Sareen
committed
Merge remote-tracking branch 'upstream/master' into BUG-32108
Sumanau Sareen
committed
Added a whatsnew entry
Sumanau Sareen
committed