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  1. Calcite
  2. CALCITE-1056

Simplify predicate of JOIN, and optimize away LIMIT 0

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.7.0
    • Component/s: None
    • Labels:
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      Description

      Following CALCITE-996, RelBuilder should simplify predicates in other situations, such as the and method and the join method.

      RelBuilder.filter(false) and RelBuilder.limit(0, 0) should simplify to RelBuilder.empty(), a new method that returns an empty relation. The default implementation returns a Values with no rows, but schema-on-query systems such as Drill might override the empty method.

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            • Assignee:
              julianhyde Julian Hyde
              Reporter:
              julianhyde Julian Hyde
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