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https://issues.apache.org/jira/browse/FLINK-3064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15024549#comment-15024549
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ASF GitHub Bot commented on FLINK-3064:
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Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1396#issuecomment-159274216
Will be merging.
> Missing size check in GroupReduceOperatorBase leads to NPE
> ----------------------------------------------------------
>
> Key: FLINK-3064
> URL: https://issues.apache.org/jira/browse/FLINK-3064
> Project: Flink
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.0
> Reporter: Martin Junghanns
> Assignee: Martin Junghanns
> Priority: Minor
>
> The following example leads to a NPE:
> {code:java}
> ExecutionEnvironment env =
> ExecutionEnvironment.createCollectionsEnvironment();
> env.fromCollection(Lists.newArrayList(new Tuple1<>(1L)))
> .filter(new AlwaysFalseFilter()) // returns false for any element
> .sum(0)
> .print();
> {code}
> In {{GroupReduceOperatorBase}}, it is not always checked if the input to a
> {{GroupReduceFunction}} is not empty. This leads to the NPE when executing
> the {{AggregateOperator}}.
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