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https://issues.apache.org/jira/browse/SPARK-29239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16937495#comment-16937495
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Liang-Chi Hsieh commented on SPARK-29239:
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I added SPARK-29221 to the title of the PR.
> 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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