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https://issues.apache.org/jira/browse/SPARK-20474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15984577#comment-15984577
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Apache Spark commented on SPARK-20474:
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User 'michal-databricks' has created a pull request for this issue:
https://github.com/apache/spark/pull/17773
> OnHeapColumnVector realocation may not copy existing data
> ---------------------------------------------------------
>
> Key: SPARK-20474
> URL: https://issues.apache.org/jira/browse/SPARK-20474
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.0
> Reporter: Michal Szafranski
>
> OnHeapColumnVector reallocation copies to the new storage data up to
> 'elementsAppended'. This variable is only updated when using the
> ColumnVector.appendX API, while ColumnVector.putX is more commonly used.
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