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  1. Apache Arrow
  2. ARROW-8205

[Rust] [DataFusion] DataFusion should enforce unique field names in a schema

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      There does not seem to be any validation to avoid schemas being created with duplicate field names. We should add this along with unit tests.

      This will require changing the signature of the constructors to try_new with a Result return type.

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              jorgecarleitao Jorge Leitão
              andygrove Andy Grove
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