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Posted to issues@spark.apache.org by "L. C. Hsieh (Jira)" <ji...@apache.org> on 2019/09/28 19:16:00 UTC

[jira] [Assigned] (SPARK-29239) Subquery should not cause NPE when eliminating subexpression

     [ https://issues.apache.org/jira/browse/SPARK-29239?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

L. C. Hsieh reassigned SPARK-29239:
-----------------------------------

    Assignee: L. C. Hsieh

> Subquery should not cause NPE when eliminating subexpression
> ------------------------------------------------------------
>
>                 Key: SPARK-29239
>                 URL: https://issues.apache.org/jira/browse/SPARK-29239
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: L. C. Hsieh
>            Assignee: L. C. Hsieh
>            Priority: Major
>
> Subexpression elimination can possibly cause NPE when applying on execution subquery expression like ScalarSubquery. It is because PlanExpression wraps query plan. To compare query plan on executor when eliminating subexpression, can cause unexpected error, like NPE when accessing transient fields.



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