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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