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https://issues.apache.org/jira/browse/FLINK-24252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17414536#comment-17414536
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Thomas Weise commented on FLINK-24252:
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Thanks for capturing this. Since sources are not always known at graph
construction time, there could be scenarios where the user will still have to
add the type information. But as long as at least one source is constructed
eagerly (and therefore visible to the builder code), we could infer the type.
> HybridSource should return TypeInformation
> ------------------------------------------
>
> Key: FLINK-24252
> URL: https://issues.apache.org/jira/browse/FLINK-24252
> Project: Flink
> Issue Type: Improvement
> Reporter: Arvid Heise
> Assignee: Arvid Heise
> Priority: Major
>
> Because {{HybridSource}} will never bind the actual type, it would be a good
> additional to implement {{ResultTypeQueryable}} to improve the usability. The
> type should be fetched or inferred from the wrapped sources.
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