ERR: Better error message for missing columns in aggregate#32836

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jreback merged 4 commits intopandas-dev:masterfrom

JDTruj2018:issue-32755

Mar 22, 2020

Commits on Mar 20, 2020

Issue 32755: More descriptive SpecificationError message that reports to user non-existing columns causing error
JDTruj2018
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Commits on Mar 21, 2020

Commits on Mar 22, 2020

Merge remote-tracking branch 'upstream/master' into issue-32755
JDTruj2018
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