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https://issues.apache.org/jira/browse/OPTIQ-368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde closed OPTIQ-368.
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Close issues resolved in release 0.9.0-incubating (2014-08-25).
> 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
> Fix For: 0.9.0-incubating
>
>
> 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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