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https://issues.apache.org/jira/browse/FLINK-2135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Robert Metzger resolved FLINK-2135.
-----------------------------------
Resolution: Fixed
Fix Version/s: 0.9
Resolved in http://git-wip-us.apache.org/repos/asf/flink/commit/0081fb2e
> Java plan translation fails with ClassCastException (probably in first())
> -------------------------------------------------------------------------
>
> Key: FLINK-2135
> URL: https://issues.apache.org/jira/browse/FLINK-2135
> Project: Flink
> Issue Type: Bug
> Components: Java API
> Affects Versions: 0.9
> Reporter: Robert Metzger
> Assignee: Robert Metzger
> Fix For: 0.9
>
>
> A user reported the following error
> {code}
> Exception in thread "main" java.lang.ClassCastException:
> org.apache.flink.api.java.functions.FirstReducer cannot be cast to
> org.apache.flink.api.common.functions.RichGroupReduceFunction
> at
> org.apache.flink.api.java.operators.translation.PlanUnwrappingSortedReduceGroupOperator.<init>(PlanUnwrappingSortedReduceGroupOperator.java:40)
> at
> org.apache.flink.api.java.operators.GroupReduceOperator.translateSelectorFunctionSortedReducer(GroupReduceOperator.java:278)
> at
> org.apache.flink.api.java.operators.GroupReduceOperator.translateToDataFlow(GroupReduceOperator.java:177)
> at
> org.apache.flink.api.java.operators.GroupReduceOperator.translateToDataFlow(GroupReduceOperator.java:50)
> at
> org.apache.flink.api.java.operators.OperatorTranslation.translateSingleInputOperator(OperatorTranslation.java:124)
> at
> org.apache.flink.api.java.operators.OperatorTranslation.translate(OperatorTranslation.java:86)
> at
> org.apache.flink.api.java.operators.OperatorTranslation.translateSingleInputOperator(OperatorTranslation.java:122)
> at
> org.apache.flink.api.java.operators.OperatorTranslation.translate(OperatorTranslation.java:86)
> at
> org.apache.flink.api.java.operators.OperatorTranslation.translateSingleInputOperator(OperatorTranslation.java:122)
> at
> org.apache.flink.api.java.operators.OperatorTranslation.translate(OperatorTranslation.java:86)
> at
> org.apache.flink.api.java.operators.OperatorTranslation.translate(OperatorTranslation.java:61)
> at
> org.apache.flink.api.java.operators.OperatorTranslation.translateToPlan(OperatorTranslation.java:49)
> at
> org.apache.flink.api.java.ExecutionEnvironment.createProgramPlan(ExecutionEnvironment.java:925)
> at
> org.apache.flink.api.java.ExecutionEnvironment.createProgramPlan(ExecutionEnvironment.java:893)
> at
> org.apache.flink.api.java.LocalEnvironment.execute(LocalEnvironment.java:50)
> at
> org.apache.flink.api.java.ExecutionEnvironment.execute(ExecutionEnvironment.java:789)
> at org.apache.flink.api.java.DataSet.collect(DataSet.java:411)
> at org.apache.flink.api.java.DataSet.print(DataSet.java:1346)
> at com.dataartisans.GroupReduceBug.main(GroupReduceBug.java:43)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
> {code}
> It is reproducible with the following code
> {code}
> ExecutionEnvironment ee =
> ExecutionEnvironment.getExecutionEnvironment();
> DataSet<String> b = ee.fromElements("a", "b");
> GroupReduceOperator<String, String> a = b.groupBy(new
> KeySelector<String, Long>() {
> @Override
> public Long getKey(String value) throws Exception {
> return 1L;
> }
> }).sortGroup(new KeySelector<String, Double>() {
> @Override
> public Double getKey(String value) throws Exception {
> return 1.0;
> }
> }, Order.DESCENDING).first(10);
> a.print();
> {code}
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