Backport PR #37149 on branch 1.1.x (BUG: GroupBy().fillna() performance regression)#37223

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simonjayhawkins merged 1 commit intopandas-dev:1.1.xfrom

meeseeksmachine:auto-backport-of-pr-37149-on-1.1.x

Oct 19, 2020

Commits on Oct 18, 2020

Backport PR #37149: BUG: GroupBy().fillna() performance regression

smithto1
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meeseeksmachine
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