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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