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Posted to issues@spark.apache.org by "Liang-Chi Hsieh (JIRA)" <ji...@apache.org> on 2017/08/17 04:18:00 UTC
[jira] [Updated] (SPARK-21759) PullupCorrelatedPredicates should
not produce unresolved plan
[ https://issues.apache.org/jira/browse/SPARK-21759?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Liang-Chi Hsieh updated SPARK-21759:
------------------------------------
Summary: PullupCorrelatedPredicates should not produce unresolved plan (was: PullupCorrelatedPredicates can produce unresolved plan)
> PullupCorrelatedPredicates should not produce unresolved plan
> -------------------------------------------------------------
>
> Key: SPARK-21759
> URL: https://issues.apache.org/jira/browse/SPARK-21759
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Liang-Chi Hsieh
>
> With the check for structural integrity proposed in SPARK-21726, I found that an optimization rule {{PullupCorrelatedPredicates}} can produce unresolved plans.
> For a correlated IN query like:
> {code}
> Project [a#0]
> +- Filter a#0 IN (list#4 [b#1])
> : +- Project [c#2]
> : +- Filter (outer(b#1) < d#3)
> : +- LocalRelation <empty>, [c#2, d#3]
> +- LocalRelation <empty>, [a#0, b#1]
> {code}
> After {{PullupCorrelatedPredicates}}, it produces query plan like:
> {code}
> 'Project [a#0]
> +- 'Filter a#0 IN (list#4 [(b#1 < d#3)])
> : +- Project [c#2, d#3]
> : +- LocalRelation <empty>, [c#2, d#3]
> +- LocalRelation <empty>, [a#0, b#1]
> {code}
> Because the correlated predicate involves another attribute {{d#3}} in subquery, it has been pulled out and added into the {{Project}} on the top of the subquery.
> When {{list}} in {{In}} contains just one {{ListQuery}}, {{In.checkInputDataTypes}} checks if the size of {{value}} expressions matches the output size of subquery. In the above example, there is only {{value}} expression and the subquery output has two attributes {{c#2, d#3}}, so it fails the check and {{In.resolved}} returns {{false}}.
> We should let {{PullupCorrelatedPredicates}} produce resolved plans to pass the structural integrity check.
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