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Posted to issues@spark.apache.org by "Yuming Wang (Jira)" <ji...@apache.org> on 2019/09/25 07:45:00 UTC
[jira] [Commented] (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:comment-tabpanel&focusedCommentId=16937485#comment-16937485 ]
Yuming Wang commented on SPARK-29239:
-------------------------------------
Is it related to SPARK-29221?
> 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: Liang-Chi 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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