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https://issues.apache.org/jira/browse/SPARK-14354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223290#comment-15223290
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Apache Spark commented on SPARK-14354:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/12138
> Let Expand take name expressions and infer output attributes
> ------------------------------------------------------------
>
> Key: SPARK-14354
> URL: https://issues.apache.org/jira/browse/SPARK-14354
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Liang-Chi Hsieh
>
> Currently we create Expand operator by specifying projections
> (Seq[Seq[Expression]]) and its output. We allow Expand to reuse child
> operator's attributes and so make its contraints invalid. We should let it
> take name expressions and infer output itself.
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