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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 04:13:16 UTC
[jira] [Resolved] (SPARK-16849) Improve subquery execution by
deduplicating the subqueries with the same results
[ https://issues.apache.org/jira/browse/SPARK-16849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon resolved SPARK-16849.
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Resolution: Incomplete
> Improve subquery execution by deduplicating the subqueries with the same results
> --------------------------------------------------------------------------------
>
> Key: SPARK-16849
> URL: https://issues.apache.org/jira/browse/SPARK-16849
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Liang-Chi Hsieh
> Priority: Major
> Labels: bulk-closed
> Attachments: de-duplicating subqueries.pdf
>
>
> The subqueries in SparkSQL will be run even they have the same physical plan and output same results. We should be able to deduplicate these subqueries which are referred in a query for many times.
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