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https://issues.apache.org/jira/browse/SPARK-29239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16937491#comment-16937491
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Jungtaek Lim edited comment on SPARK-29239 at 9/25/19 7:58 AM:
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Would we link SPARK-29239 to SPARK-29221 or add "SPARK-29221" in the title of
PR as well so that SPARK-29221 would not be forgotten when SPARK-29239 is
resolved?
was (Author: kabhwan):
Would we link SPARK-23239 to SPARK-29221 or add "SPARK-29221" in the title of
PR as well so that SPARK-29221 would not be forgotten when SPARK-29239 is
resolved?
> 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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