[jira] [Created] (ARROW-10963) [Rust] [DataFusion] Improve the PartailEq implementation for UDF expressions

["Daniel Russo (Jira)" <ji...@apache.org>]

Daniel Russo created ARROW-10963:
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             Summary: [Rust] [DataFusion] Improve the PartailEq implementation for UDF expressions
                 Key: ARROW-10963
                 URL: https://issues.apache.org/jira/browse/ARROW-10963
             Project: Apache Arrow
          Issue Type: New Feature
          Components: Rust, Rust - DataFusion
            Reporter: Daniel Russo


An implementation of {{PartialEq}} for {{ScalarUDF}} and {{AggregateUDF}} was added in ARROW-10808 ([pull request|https://github.com/apache/arrow/pull/8836], which was a requirement for the {{PartialEq}} derivation for {{Expr}}.

The implementation checks equality on only the UDFs' {{name}} and {{signature}} fields: the underlying assumption is two UDFs with the same name and signature must be the same UDF. This assumption may hold up in a SQL context where UDFs are registered by name (therefore guaranteeing they are distinct), however, it doesn't hold up in a general case where there are no uniqueness requirements on the name. 

Improve the equality implementation for {{ScalarUDF}} and {{AggregateUDF}}. For additional context, see the discussion in the pull request [here|https://github.com/apache/arrow/pull/8836#discussion_r536874229]. 




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