[jira] [Created] (CALCITE-3550) Make SqlTypeAssignmentRules conversion mapping pluggable

["Danny Chen (Jira)" <ji...@apache.org>]

Danny Chen created CALCITE-3550:
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             Summary: Make SqlTypeAssignmentRules conversion mapping pluggable
                 Key: CALCITE-3550
                 URL: https://issues.apache.org/jira/browse/CALCITE-3550
             Project: Calcite
          Issue Type: Improvement
          Components: core
    Affects Versions: 1.21.0
            Reporter: Danny Chen
             Fix For: 1.22.0


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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