[jira] [Created] (OPTIQ-368) Add SemiJoinRule, planner rule to convert project-join-aggregate into semi-join

["Julian Hyde (JIRA)" <ji...@apache.org>]

Julian Hyde created OPTIQ-368:
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             Summary: Add SemiJoinRule, planner rule to convert project-join-aggregate into semi-join
                 Key: OPTIQ-368
                 URL: https://issues.apache.org/jira/browse/OPTIQ-368
             Project: Optiq
          Issue Type: Bug
            Reporter: Julian Hyde
            Assignee: Julian Hyde


Semi-join is an important logical relational expression but many query sources (e.g. SqlToRelTranslator) do not generate them. This rule would create SemiJoinRel if it sees a join that aggregates its right input on the join key; a project on top is necessary to be sure that columns from the right side of the join are not being used.

Also, add class JoinInfo and a method on JoinRelBase 'public JoinInfo analyzeCondition()', to make it easier to analyze whether join conditions are equi-joins.



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