Martin Junghanns created FLINK-3064:
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Summary: 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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