[jira] [Created] (CALCITE-3372) Add a rule to transform a semijoin into a join on top of aggregate

["Haisheng Yuan (Jira)" <ji...@apache.org>]

Haisheng Yuan created CALCITE-3372:
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             Summary: Add a rule to transform a semijoin into a join on top of aggregate
                 Key: CALCITE-3372
                 URL: https://issues.apache.org/jira/browse/CALCITE-3372
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Haisheng Yuan


{code:java}
Semijoin
     |- TS1
     +- TS2
{code}
can be transformed into
{code:java}
Project
  +-InnerJoin
          |- TS1
          +- Aggregate
                    + TS2
{code}

We may benefit from the new plan by join relation reordering if TS2 is large even after aggregation.





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