Backport PR #36753 on branch 1.1.x: BUG: Segfault with string Index when using Rolling after Groupby#37003

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simonjayhawkins merged 2 commits intopandas-dev:1.1.xfrom

simonjayhawkins:auto-backport-of-pr-36753-on-1.1.x

Oct 9, 2020

Commits on Oct 9, 2020

Backport PR #36753 on branch 1.1.x: BUG: Segfault with string Index when using Rolling after Groupby

phofl
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Merge remote-tracking branch 'upstream/1.1.x' into auto-backport-of-pr-36753-on-1.1.x
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