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  1. Calcite
  2. CALCITE-2968

New AntiJoin relational expression

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Details

    • New Feature
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 1.20.0
    • None

    Description

      The goal of this ticket is to follow the discussion started in CALCITE-2920 (and its PR).

      With the implementation of CALCITE-2920, RelBuilder has now a method to create an AntiJoin. However, since, for the moment, there is no "AntiJoin" expression, the only possibility to build an AntiJoin is using a LogicalCorrelate with SemiJoinType.ANTI, and that's exactly what this method does, for now.
      The idea would be to "generalize" this with the creation of a new AntiJoin (a.k.a. AntiSemiJoin) relational expression. With the implementation of CALCITE-2969 (re-design of join-like expressions), it seems clear that the new AntiJoin expression will be a LogicalJoin with JoinType=ANTI. Also, it will have to be verified that:

      • this new AntiJoin works fine in EnumerableConvention with all types of join condition (equi-join, partial equi-join, non equi-join)
      • this new AntiJoin can be correctly transformed into a Correlate (type ANTI) via JoinToCorrelateRule

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            rubenql Ruben Q L
            rubenql Ruben Q L
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