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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