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https://issues.apache.org/jira/browse/SPARK-12503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li updated SPARK-12503:
----------------------------
Description:
"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
Also, the same topic in Hive: https://issues.apache.org/jira/browse/HIVE-11775
was:
"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
> 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
> Also, the same topic in Hive: https://issues.apache.org/jira/browse/HIVE-11775
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