Maryann Xue created PHOENIX-2167:
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Summary: Add new interface in QueryPlan for pushing down a limit
value.
Key: PHOENIX-2167
URL: https://issues.apache.org/jira/browse/PHOENIX-2167
Project: Phoenix
Issue Type: Sub-task
Reporter: Maryann Xue
Assignee: Maryann Xue
Calcite rel trees are compiled bottom-up into Phoenix QueryPlans, the easiest
way to implement a Limit RelNode in the tree is to create a ClientScanPlan with
the limit value and wrap it around the inner plan. However, oftentimes this may
not be efficient.
For example, select * from T limit 10, the original Phoenix compiler would
generate a ScanPlan with limit 10, apply a PageFilter and avoid using
sophisticated or expensive ResultIterators.
So it would make sense to push down the limit to a QueryPlan as low as possible
and create a new copy of the plan based on this rule.
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