[jira] [Commented] (SPARK-44408) Remove/Reduce usage of TypeTag in public APIs

["Joan Goyeau (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-44408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17772038#comment-17772038 ] 

Joan Goyeau commented on SPARK-44408:
-------------------------------------

I'm linking here some work that has been done to support Scala 3 in the current Spark (Scala 2.13) [https://github.com/vincenzobaz/spark-scala3]

> Remove/Reduce usage of TypeTag in public APIs
> ---------------------------------------------
>
>                 Key: SPARK-44408
>                 URL: https://issues.apache.org/jira/browse/SPARK-44408
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 4.0.0
>            Reporter: Emil Ejbyfeldt
>            Priority: Major
>
> In scala 3 there is no replacement for TypeTag ([https://github.com/lampepfl/dotty-feature-requests/issues/62)] it seems like the intended replacement is just to do compile time reflection using macros.
> In order to be able to make a scala 3 compatible release of spark 4 we should reduce/remove usage of TypeTag in public APis like `org.apache.spark.sql.functions.udf` instead I suggest that it would be better it just required a `ExpressionEncoder` (or some other spark owned type class) directly. That why we would just need to provide a scala 3 specific way only for the type class derivation and not for the other APIs that are currently using TypeTag.



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