[ARROW-9835] [Rust] [DataFusion] Remove FunctionMeta

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: Rust, Rust - DataFusion
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/25874
• Assignee: Jorge Leitão
• Reporter: Jorge Leitão
• Created: 23/Aug/20 11:38
• Updated: 11/Jan/23 08:09
• Resolved: 24/Aug/20 23:42

Description

Currently, our code works as follows:

1. Declare a UDF via udf::ScalarFunction
2. Register the UDF
3. call scalar_function("name", vec![...], type) to use it during planning.

However, during planning, we:

1. Get the ScalarFunction by name
2. convert it to FunctionMetadata
3. get the ScalarFunction associated with FunctionMetadata's name

I.e. FunctionMetadata does not seem to be needed.

Goal: remove FunctionMetadata and just pass udf::ScalarFunction directly from the registry to the physical plan.

Issue Links

• links to: GitHub Pull Request #8030