Backport PR #42692 on branch 1.3.x (Regression in merge_asof raising KeyError when at least one by columnis in index)#42694

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simonjayhawkins merged 1 commit intopandas-dev:1.3.xfrom

meeseeksmachine:auto-backport-of-pr-42692-on-1.3.x

Jul 24, 2021

Commits on Jul 23, 2021

Backport PR #42692: Regression in merge_asof raising KeyError when at least one by columnis in index

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