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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7142) Scala DataSet API ignores ResultTypeQueryable interface
Date Tue, 11 Jul 2017 10:39:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16082019#comment-16082019

Stephan Ewen commented on FLINK-7142:


> Scala DataSet API ignores ResultTypeQueryable interface
> -------------------------------------------------------
>                 Key: FLINK-7142
>                 URL: https://issues.apache.org/jira/browse/FLINK-7142
>             Project: Flink
>          Issue Type: Bug
>          Components: DataSet API, Scala API
>    Affects Versions: 1.3.1, 1.4.0
>            Reporter: Fabian Hueske
> The {{ResultTypeQueryable}} is used to specify the return type of user-defined functions.
The Scala DataSet API ignores this interface. The only way to override the inferred type information
is to use implicit values. However, the {{ResultTypeQueryable}} interface has the nice property
that the return type is defined in the actual function, whereas implicit types are defined
in the program, i.e., outside of the function.
> IMO, the Scala DataSet API should also support the {{ResultTypeQueryable}} interface.
> What do you think [~aljoscha], [~till.rohrmann]?
> Was it a conscious decision to only support implicit type definitions?

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