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  1. Calcite
  2. CALCITE-368

Add SemiJoinRule, planner rule to convert project-join-aggregate into semi-join

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.9.0-incubating
    • Component/s: None
    • Labels:
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      Description

      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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          relates to

          Bug - A problem which impairs or prevents the functions of the product. CALCITE-328 Introduce semi-join-like flag in JoinRelBase

          • Major - Major loss of function.
          • Open

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              • Assignee:
                julianhyde Julian Hyde
                Reporter:
                julianhyde Julian Hyde
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                • Created:
                  Updated:
                  Resolved: