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https://issues.apache.org/jira/browse/CALCITE-3550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Danny Chen resolved CALCITE-3550.
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Assignee: Danny Chen
Resolution: Fixed
Fixed in
[ccdc169|https://github.com/apache/calcite/commit/ccdc169080a7f68066c317db67729b7df81662f6]
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> 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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