[jira] [Created] (FLINK-17625) Fix ArrayIndexOutOfBoundsException in AppendOnlyTopNFunction

[Shang Yuanchun (Jira)]

Jark Wu created FLINK-17625:
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             Summary: Fix ArrayIndexOutOfBoundsException in AppendOnlyTopNFunction
                 Key: FLINK-17625
                 URL: https://issues.apache.org/jira/browse/FLINK-17625
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
            Reporter: Jark Wu
             Fix For: 1.11.0, 1.10.2


This is reported in user mailing list: http://apache-flink.147419.n8.nabble.com/sql-topN-ArrayIndexOutOfBoundsException-td3008.html

We should check list is not empty before removing the last element in {{AppendOnlyTopNFunction#processElementWithoutRowNumber}}.

{code:java}
ava.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.elementData(ArrayList.java:422)
at java.util.ArrayList.remove(ArrayList.java:499)
at org.apache.flink.table.runtime.operators.rank.AppendOnlyTopNFunction.processElementWithoutRowNumber(AppendOnlyTopNFunction.java:205)
at org.apache.flink.table.runtime.operators.rank.AppendOnlyTopNFunction.processElement(AppendOnlyTopNFunction.java:120)
at org.apache.flink.table.runtime.operators.rank.AppendOnlyTopNFunction.processElement(AppendOnlyTopNFunction.java:46)
at org.apache.flink.streaming.api.operators.KeyedProcessOperator.processElement(KeyedProcessOperator.java:85)
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:487)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:470)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:707)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:532)
at java.lang.Thread.run(Thread.java:748)
{code}




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