[jira] [Commented] (FLINK-29739) [FLIP-265] Deprecate and remove Scala API support

[xuhuang (Jira)]

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https://issues.apache.org/jira/browse/FLINK-29739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17881739#comment-17881739
 ] 

xuhuang commented on FLINK-29739:
---------------------------------

Hi, [~lincoln.86xy]

I attempted to relocate some utility classes from the _{{flink-scala}}_ and 
_{{flink-streaming-scala}}_ modules into the _{{flink-table-api-scala}}_ 
module, e.g. _{{org.apache.flink.api.scala.codegen}}_ and 
{{{}_org.apache.flink.api.scala.typeutils_{}}}. My intention was to modify the 
Flink table module to utilize Java DataStream API instead of Scala DataStream 
API, thereby eliminating its dependency on both the {{_flink-scala_}} and 
_{{flink-streaming-scala}}_ modules.

Unfortunately, I encountered a Scala-related issue that ultimately led me to 
abandon this approach.

I specifically tried to migrate a Scala macro definition, 
{_}{{org.apache.flink.api.scala#createTypeInformation}}{_}, to the 
{_}{{org.apache.flink.table.api}} package{_}. However, I ran into an 
error—though I can't recall the exact message. It likely indicated that macro 
definitions and their usage cannot exist within the same module.

Hope this information helps you in making a judgment. 

> [FLIP-265] Deprecate and remove Scala API support
> -------------------------------------------------
>
>                 Key: FLINK-29739
>                 URL: https://issues.apache.org/jira/browse/FLINK-29739
>             Project: Flink
>          Issue Type: Technical Debt
>          Components: API / Scala
>            Reporter: Martijn Visser
>            Priority: Major
>              Labels: 2.0-related
>
> FLIP: 
> https://cwiki.apache.org/confluence/display/FLINK/FLIP-265+Deprecate+and+remove+Scala+API+support



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