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https://issues.apache.org/jira/browse/SPARK-25352?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-25352:
-----------------------------------
Assignee: Liang-Chi Hsieh
> Perform ordered global limit when limit number is bigger than
> topKSortFallbackThreshold
> ---------------------------------------------------------------------------------------
>
> Key: SPARK-25352
> URL: https://issues.apache.org/jira/browse/SPARK-25352
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Liang-Chi Hsieh
> Assignee: Liang-Chi Hsieh
> Priority: Major
> Fix For: 2.4.0
>
>
> We have optimization on global limit to evenly distribute limit rows across
> all partitions. This optimization doesn't work for ordered results.
> For a query ending with sort + limit, in most cases it is performed by
> `TakeOrderedAndProjectExec`.
> But if limit number is bigger than `SQLConf.TOP_K_SORT_FALLBACK_THRESHOLD`,
> global limit will be used. At this moment, we need to do ordered global limit.
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