REF: insert self.on column _after_ concat#35746

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mroeschke merged 2 commits intopandas-dev:masterfrom

jbrockmendel:reset-dropped-locs-6

Aug 20, 2020

Commits on Aug 15, 2020

REF: insert self.on column _after_ concat
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Commits on Aug 17, 2020

Merge branch 'master' of https://github.com/pandas-dev/pandas into reset-dropped-locs-6
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