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https://issues.apache.org/jira/browse/FLINK-15475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17329482#comment-17329482
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Flink Jira Bot commented on FLINK-15475:
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This issue is assigned but has not received an update in 7 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> 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: Minor
> Labels: stale-assigned, stale-minor
>
> 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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