Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/12036#issuecomment-203159161
@viirya Thanks for the clarification. That said, I think the interfaces
here can be simplified significantly. For instance, we don't need to expose
`ExpressionInfo` since we can just get that from `FunctionBuilder`, then we
don't need to change anything in `FunctionRegistry`.
I did a first part of the clean up in #12051. With those changes, I think
implementing the function DDLs will be pretty straightforward. The only
additional thing that needs to be implemented is adding the resource list to
`CatalogFunction`, but that's also simple to do.
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