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https://issues.apache.org/jira/browse/FLINK-4804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chesnay Schepler reassigned FLINK-4804:
---------------------------------------
Assignee: Chesnay Schepler
> Grouping.first() function usage fails
> -------------------------------------
>
> Key: FLINK-4804
> URL: https://issues.apache.org/jira/browse/FLINK-4804
> Project: Flink
> Issue Type: Bug
> Reporter: Yakov Goldberg
> Assignee: Chesnay Schepler
>
> Trying to use Grouping.first() in following example:
> {code}
> dd2 = env.from_elements((1, "data"), (1, "hello"), (1, "z"))
> dd2 \
> .group_by(0) \
> .sort_group(1, Order.ASCENDING) \
> .first(2) \
> .reduce_group(PlainReduce(), combinable=True)
> {code}
> 1. Is this example correct?
> 2. If so, got the following error:
> {code}
> ------------------------------------------------------------
> The program finished with the following exception:
> org.apache.flink.client.program.ProgramInvocationException: The main method
> caused an error.
> at
> org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:520)
> at
> org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:403)
> at org.apache.flink.client.program.Client.runBlocking(Client.java:248)
> at
> org.apache.flink.client.CliFrontend.executeProgramBlocking(CliFrontend.java:866)
> at org.apache.flink.client.CliFrontend.run(CliFrontend.java:333)
> at
> org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1192)
> at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1243)
> Caused by: java.lang.ClassCastException:
> org.apache.flink.api.java.operators.SortedGrouping cannot be cast to
> org.apache.flink.api.java.DataSet
> at
> org.apache.flink.python.api.PythonPlanBinder.createFirstOperation(PythonPlanBinder.java:470)
> at
> org.apache.flink.python.api.PythonPlanBinder.receiveOperations(PythonPlanBinder.java:325)
> at
> org.apache.flink.python.api.PythonPlanBinder.receivePlan(PythonPlanBinder.java:236)
> at
> org.apache.flink.python.api.PythonPlanBinder.runPlan(PythonPlanBinder.java:140)
> at
> org.apache.flink.python.api.PythonPlanBinder.main(PythonPlanBinder.java:113)
> 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
> org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:505)
> {code}
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