Maryann Xue created CALCITE-832:
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Summary: General optimization rules for Limit
Key: CALCITE-832
URL: https://issues.apache.org/jira/browse/CALCITE-832
Project: Calcite
Issue Type: Improvement
Reporter: Maryann Xue
Assignee: Julian Hyde
1. LimitUnionRule:
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 Rels.
2. LimitJoinRule:
Rule that applies to a Limit on top of an *OUTER* Join. The original Limit
won't go away after applying this rule, but additional Limit node(s) will be
created on top of the outer-side child (or children if it's a FULL OUTER Join).
This will have impact on the cost of modified child node(s) as well as that of
the join node itself (among different join algorithms).
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