Liang-Chi Hsieh created SPARK-25352:
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Summary: 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
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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