[jira] [Created] (FLINK-3064) Missing size check in GroupReduceOperatorBase leads to NPE

[Shang Yuanchun (Jira)]

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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