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https://issues.apache.org/jira/browse/SPARK-20730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-20730.
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Resolution: Fixed
Fix Version/s: 2.3.0
Issue resolved by pull request 17970
[https://github.com/apache/spark/pull/17970]
> Add a new Optimizer rule to combine nested Concats
> --------------------------------------------------
>
> Key: SPARK-20730
> URL: https://issues.apache.org/jira/browse/SPARK-20730
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Takeshi Yamamuro
> Assignee: Takeshi Yamamuro
> Fix For: 2.3.0
>
>
> The master supports a pipeline operator '||' to concatenate strings. Since
> the parser generates nested Concat expressions, the optimizer needs to
> combine the nested expressions.
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