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https://issues.apache.org/jira/browse/FLINK-15475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17321425#comment-17321425
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Flink Jira Bot commented on FLINK-15475:
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This issue and all of its Sub-Tasks have not been updated for 180 days. So, it
has been labeled "stale-minor". If you are still affected by this bug or are
still interested in this issue, please give an update and remove the label. In
7 days the issue will be closed automatically.
> 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-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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