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

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

     [ https://issues.apache.org/jira/browse/CALCITE-3550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Danny Chen resolved CALCITE-3550.
---------------------------------
      Assignee: Danny Chen
    Resolution: Fixed

Fixed in [ccdc169|https://github.com/apache/calcite/commit/ccdc169080a7f68066c317db67729b7df81662f6] !

> 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
>            Assignee: Danny Chen
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.22.0
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> 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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