ARROW-9752: [Rust] [DataFusion] Add support for User-Defined Aggregate Functions.#8180

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jorgecarleitao wants to merge 5 commits intoapache:masterfrom

jorgecarleitao:agg2

Commits on Sep 20, 2020

Commits on Sep 21, 2020

Minor improvements.
jorgecarleitao
committed

Commits on Sep 22, 2020