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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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Apache Spark reassigned SPARK-20730:
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Assignee: Apache Spark
> 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: 2.1.1
> Reporter: Takeshi Yamamuro
> Assignee: Apache Spark
>
> 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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