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Posted to issues@spark.apache.org by "Xiao Li (JIRA)" <ji...@apache.org> on 2015/12/23 19:13:46 UTC

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

Xiao Li created SPARK-12503:
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             Summary: 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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