ARROW-8205: [Rust] [DataFusion] Added check to uniqueness of column names.#8334

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jorgecarleitao wants to merge 2 commits intoapache:masterfrom

jorgecarleitao:check_schema

Commits on Oct 3, 2020

Added check uniqueness of column names.
jorgecarleitao
committed

Commits on Oct 5, 2020

Added alias to expression.
jorgecarleitao
committed