REF: make Grouping less stateful#41529

Merged

jreback merged 14 commits intopandas-dev:masterfrom

jbrockmendel:ref-grouper-3

May 18, 2021

Commits on May 7, 2021

Commits on May 10, 2021

Merge branch 'master' into ref-grouper-2
jbrockmendel
committed

Commits on May 11, 2021

Merge remote-tracking branch 'upstream/master' into ref-grouper-3
jbrockmendel
committed

Commits on May 12, 2021

Merge branch 'master' into ref-grouper-3
jbrockmendel
committed

Commits on May 13, 2021

Merge branch 'master' into ref-grouper-3
jbrockmendel
committed

Commits on May 18, 2021