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https://issues.apache.org/jira/browse/SPARK-16703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15391370#comment-15391370
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Apache Spark commented on SPARK-16703:
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User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/14334
> Extra space in WindowSpecDefinition SQL representation
> ------------------------------------------------------
>
> Key: SPARK-16703
> URL: https://issues.apache.org/jira/browse/SPARK-16703
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
> Priority: Minor
>
> For a {{WindowSpecDefinition}} whose {{partitionSpec}} is empty, there's an
> extra space in its SQL representation:
> {code:sql}
> ( ORDER BY `a` ASC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
> {code}
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