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https://issues.apache.org/jira/browse/SPARK-25123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16580868#comment-16580868
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Apache Spark commented on SPARK-25123:
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User 'mgaido91' has created a pull request for this issue:
https://github.com/apache/spark/pull/22111
> SimpleExprValue may cause the loss of a reference
> -------------------------------------------------
>
> Key: SPARK-25123
> URL: https://issues.apache.org/jira/browse/SPARK-25123
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Marco Gaido
> Priority: Major
>
> While introducing the new JavaCode abstraction in order to enable tracking
> references and allowing transformations, we added 3 types of expression
> values. They are global variables, local variables and simple expressions.
> While checking whether we could use this new abstraction for fixing an issue
> reported in another JIRA, I just realized that SimpleExprValue contains a
> string with the generated code, but this can actually contain other
> variables. Since the value is carried in SimpleExprValue is a string, though,
> we were loosing track of the variable reference.
> So this JIRA is for using a Block in order to represent the java code carried
> by SimpleExprValue, so that we don't loose references.
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