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https://issues.apache.org/jira/browse/SPARK-8104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14573094#comment-14573094
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Apache Spark commented on SPARK-8104:
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User 'cloud-fan' has created a pull request for this issue:
https://github.com/apache/spark/pull/6647
> move the auto alias logic into Analyzer
> ---------------------------------------
>
> Key: SPARK-8104
> URL: https://issues.apache.org/jira/browse/SPARK-8104
> Project: Spark
> Issue Type: Bug
> Reporter: Wenchen Fan
>
> Currently we auto alias expression in parser. However, during parser phase we
> don't have enough information to do the right alias. For example, Generator
> that has more than 1 kind of element need MultiAlias, ExtractValue don't need
> Alias if it's in middle of a ExtractValue chain.
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