[GitHub] [spark] wmoustafa edited a comment on pull request #24559: [SPARK-27658][SQL] Add FunctionCatalog API

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wmoustafa edited a comment on pull request #24559:
URL: https://github.com/apache/spark/pull/24559#issuecomment-732539897


   In case you are interested in taking a look into what a UDF in Transport boils down to in the case of Spark, you can check [com/linkedin/transport/spark/StdUdfWrapper.scala](https://github.com/linkedin/transport/blob/master/transportable-udfs-spark/src/main/scala/com/linkedin/transport/spark/StdUdfWrapper.scala). This is an [example user-facing UDF](https://github.com/linkedin/transport/blob/wmoustafa-api-v1/transportable-udfs-examples/transportable-udfs-example-udfs/src/main/java/com/linkedin/transport/examples/MapFromTwoArraysFunction.java) that is translated to the Expression API. You can think of it as an API on top of an API.


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