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Posted to issues@spark.apache.org by "Liang-Chi Hsieh (Jira)" <ji...@apache.org> on 2019/09/25 07:29:00 UTC

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

Liang-Chi Hsieh created SPARK-29239:
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             Summary: 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


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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