[jira] [Updated] (FLINK-15475) Add isOutputTypeUsed() API to Transformation

["Konstantin Knauf (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-15475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Knauf updated FLINK-15475:
-------------------------------------
      Labels: stale-assigned  (was: auto-closed stale-assigned)
    Priority: Not a Priority  (was: Minor)

> Add isOutputTypeUsed() API to Transformation
> --------------------------------------------
>
>                 Key: FLINK-15475
>                 URL: https://issues.apache.org/jira/browse/FLINK-15475
>             Project: Flink
>          Issue Type: Improvement
>          Components: API / Core, API / DataSet, API / DataStream
>            Reporter: Rong Rong
>            Assignee: Rong Rong
>            Priority: Not a Priority
>              Labels: stale-assigned
>
> Currently there's no way to "peek" into a `Transformation` object and see if `typeUsed` has been set or not. The only way is to invoke the `setOutputType` API and wrap around it with a try-catch block similar to:
> {code:java}
> try {
>   (SingleOutputStreamOperator)dataStream
>     .returns(myOutputType);
> } catch (ValidationException ex) {
>   // ... handle exception when type has been used.
> }
> {code}
> It would be nice if we have a `isTypeUsed()` or `isOutputTypeUsed()` API to check whether a particular transformation has a definitive output type set / used or not.



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