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https://issues.apache.org/jira/browse/FLINK-1776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377789#comment-14377789
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Stephan Ewen commented on FLINK-1776:
-------------------------------------
That is critical, I agree.
Can we make the assumption that all fields are shifted by one (or as many as
the key selector returns values) since the data gets wrapped in a tuple2(key,
value)?
> APIs provide invalid Semantic Properties for Operators with SelectorFunction
> keys
> ---------------------------------------------------------------------------------
>
> Key: FLINK-1776
> URL: https://issues.apache.org/jira/browse/FLINK-1776
> Project: Flink
> Issue Type: Bug
> Components: Java API, Scala API
> Affects Versions: 0.9
> Reporter: Fabian Hueske
> Assignee: Fabian Hueske
> Priority: Critical
> Fix For: 0.9
>
>
> Semantic properties are defined by users and evaluated by the optimizer.
> When semantic properties such as forwarded or read fields are bound to the
> input type of a function.
> In case of operators with selector function keys, a user function is wrapped
> by a wrapping function that has a different input types than the original
> user function. However, the user-defined semantic properties are verbatim
> forwarded to the optimizer.
> Since the properties refer to a specific type which is changed by the
> wrapping function and the semantic properties are not adapted, the optimizer
> uses wrong properties and might produce invalid plans
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