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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/12/23 19:16:46 UTC

[jira] [Assigned] (SPARK-12503) Pushdown a Limit on top of a Union

     [ https://issues.apache.org/jira/browse/SPARK-12503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-12503:
------------------------------------

    Assignee:     (was: Apache Spark)

> Pushdown a Limit on top of a Union
> ----------------------------------
>
>                 Key: SPARK-12503
>                 URL: https://issues.apache.org/jira/browse/SPARK-12503
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.5.0, 1.6.0
>            Reporter: Xiao Li
>
> "Rule that applies to a Limit on top of a Union. The original Limit won't go away after applying this rule, but additional Limit nodes will be created on top of each child of Union, so that these children produce less rows and Limit can be further optimized for children Relations."
> -- from https://issues.apache.org/jira/browse/CALCITE-832



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