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

["dalongliu (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-17625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17105039#comment-17105039 ] 

dalongliu commented on FLINK-17625:
-----------------------------------

[~jark] Can I help to fix this bug?

> 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
>            Priority: Major
>             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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