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https://issues.apache.org/jira/browse/SPARK-21315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-21315.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.3.0
Issue resolved by pull request 18541
[https://github.com/apache/spark/pull/18541]
> Skip some spill files when generateIterator(startIndex) in
> ExternalAppendOnlyUnsafeRowArray.
> --------------------------------------------------------------------------------------------
>
> Key: SPARK-21315
> URL: https://issues.apache.org/jira/browse/SPARK-21315
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.1
> Reporter: jin xing
> Fix For: 2.3.0
>
>
> In current code, it is expensive to use
> {{UnboundedFollowingWindowFunctionFrame}}, because it is iterating from the
> start to lower bound every time calling {{write}} method. When traverse the
> iterator, it's possible to skip some spilled files thus to save some time.
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