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https://issues.apache.org/jira/browse/SPARK-10999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14948133#comment-14948133
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Apache Spark commented on SPARK-10999:
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User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/9024
> Physical plan node Coalesce should be able to handle UnsafeRow
> --------------------------------------------------------------
>
> Key: SPARK-10999
> URL: https://issues.apache.org/jira/browse/SPARK-10999
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
> Priority: Minor
>
> The following PySpark snippet shows the problem:
> {noformat}
> >>> sqlContext.range(10).selectExpr('id AS a').coalesce(1).explain(True)
> ...
> == Physical Plan ==
> Coalesce 1
> ConvertToSafe
> TungstenProject [id#3L AS a#4L]
> Scan PhysicalRDD[id#3L]
> {noformat}
> The {{ConvertToSafe}} is unnecessary.
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