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https://issues.apache.org/jira/browse/FLINK-15418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu resolved FLINK-15418.
-----------------------------
Resolution: Fixed
> StreamExecMatchRule not set FlinkRelDistribution
> ------------------------------------------------
>
> Key: FLINK-15418
> URL: https://issues.apache.org/jira/browse/FLINK-15418
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.9.1, 1.10.0
> Reporter: Benchao Li
> Assignee: Benchao Li
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.9.2, 1.10.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> StreamExecMatchRule forgets to set FlinkRelDistribution. When match clause
> with `partition by`, and parallelism > 1, will result in following exception:
> ```
> Caused by: java.lang.NullPointerException
> at
> org.apache.flink.runtime.state.heap.StateTable.put(StateTable.java:336)
> at
> org.apache.flink.runtime.state.heap.StateTable.put(StateTable.java:159)
> at
> org.apache.flink.runtime.state.heap.HeapMapState.put(HeapMapState.java:100)
> at
> org.apache.flink.runtime.state.UserFacingMapState.put(UserFacingMapState.java:52)
> at
> org.apache.flink.cep.nfa.sharedbuffer.SharedBuffer.registerEvent(SharedBuffer.java:141)
> at
> org.apache.flink.cep.nfa.sharedbuffer.SharedBufferAccessor.registerEvent(SharedBufferAccessor.java:74)
> at org.apache.flink.cep.nfa.NFA$EventWrapper.getEventId(NFA.java:483)
> at org.apache.flink.cep.nfa.NFA.computeNextStates(NFA.java:605)
> at org.apache.flink.cep.nfa.NFA.doProcess(NFA.java:292)
> at org.apache.flink.cep.nfa.NFA.process(NFA.java:228)
> at
> org.apache.flink.cep.operator.CepOperator.processEvent(CepOperator.java:420)
> at
> org.apache.flink.cep.operator.CepOperator.processElement(CepOperator.java:242)
> at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask$StreamTaskNetworkOutput.emitRecord(OneInputStreamTask.java:173)
> at
> org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.processElement(StreamTaskNetworkInput.java:151)
> at
> org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.emitNext(StreamTaskNetworkInput.java:128)
> at
> org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:69)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:311)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:187)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:488)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:470)
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:702)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:527)
> at java.lang.Thread.run(Thread.java:748)
> ```
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