[jira] [Resolved] (FLINK-3444) env.fromElements relies on the first input element for determining the DataSet/DataStream type

["Stephan Ewen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-3444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephan Ewen resolved FLINK-3444.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 1.1.0

Fixed via 6bb085ec6d70e196b7b61bec5f6dc3f924ca7906

Thank you for the contribution!

> env.fromElements relies on the first input element for determining the DataSet/DataStream type
> ----------------------------------------------------------------------------------------------
>
>                 Key: FLINK-3444
>                 URL: https://issues.apache.org/jira/browse/FLINK-3444
>             Project: Flink
>          Issue Type: Bug
>          Components: DataSet API, DataStream API
>    Affects Versions: 0.10.0, 1.0.0
>            Reporter: Vasia Kalavri
>             Fix For: 1.1.0
>
>
> The {{fromElements}} method of the {{ExecutionEnvironment}} and {{StreamExecutionEnvironment}} determines the DataSet/DataStream type by extracting the type of the first input element.
> This is problematic if the first element is a subtype of another element in the collection.
> For example, the following
> {code}
> DataStream<Event> input = env.fromElements(new Event(1, "a"), new SubEvent(2, "b"));
> {code}
> succeeds, while the following
> {code}
> DataStream<Event> input = env.fromElements(new SubEvent(1, "a"), new Event(2, "b"));
> {code}
> fails with "java.lang.IllegalArgumentException: The elements in the collection are not all subclasses of SubEvent".



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