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  1. Calcite
  2. CALCITE-368

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

          Details

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

            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: