ARROW-9887: [Rust] [DataFusion] Added support for complex return types for built-in functions#8080

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jorgecarleitao:functions

Commits on Aug 30, 2020

Added support for built-in functions with pre-determined types.
jorgecarleitao
committed
Added type coercion for functions of multiple arguments.
jorgecarleitao
committed

Commits on Aug 31, 2020