[
https://issues.apache.org/jira/browse/SPARK-27440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Hyukjin Kwon updated SPARK-27440:
---------------------------------
Fix Version/s: (was: 3.0.0)
> Optimize uncorrelated predicate subquery
> ----------------------------------------
>
> Key: SPARK-27440
> URL: https://issues.apache.org/jira/browse/SPARK-27440
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Mingcong Han
> Priority: Major
>
> Currently, we rewrite all the predicate subqueries(InSubquery, Exists) as
> semi-join/anti-join. But uncorrelated predicate subquery can be evaluated
> using a subplan instead of a join. We can firstly rewrite all the
> uncorrelated predicate subqueries as `Exists`, then optimize it and compute
> it using a subquery physical plan like ScalarSubquery.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
