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https://issues.apache.org/jira/browse/SPARK-17761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15543079#comment-15543079
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Apache Spark commented on SPARK-17761:
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User 'hvanhovell' has created a pull request for this issue:
https://github.com/apache/spark/pull/15333
> Simplify InternalRow hierarchy
> ------------------------------
>
> Key: SPARK-17761
> URL: https://issues.apache.org/jira/browse/SPARK-17761
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Herman van Hovell
> Assignee: Herman van Hovell
>
> The current InternalRow hierarchy makes a difference between immutable and
> mutable rows. In practice we cannot guarantee that an immutable internal row
> is immutable (you can always pass a mutable object as an one of its
> elements). Lets make all internal rows mutable (and reduce the complexity).
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