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  1. Calcite
  2. CALCITE-3550

Make SqlTypeAssignmentRules conversion mapping pluggable

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.21.0
    • Fix Version/s: 1.22.0
    • Component/s: core

      Description

      In CALCITE-2302, we introduce implicit type coercion for Calcite builtin conversion behaviors, we also expand the conversion matrix to support more type conversion compared to the old matrix [1], that means, we implement a conversion matrix of our Calcite style.

      As a library of other sql engines, i think we should make the conversion matrix pluggable, so that each engine can customize if the conversion is valid from a type to another.

      We have made the TypeCoercion pluggable/customizable, so if this matrix is also pluggable, then, the whole conversion behavior can be customized.

      That would give the type conversion of Calcite a pretty good flexibility.

      [1] https://docs.google.com/spreadsheets/d/1GhleX5h5W8-kJKh7NMJ4vtoE78pwfaZRJl88ULX_MgU/edit?usp=sharing

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            • Assignee:
              danny0405 Danny Chen
              Reporter:
              danny0405 Danny Chen

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