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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