Will Noble created CALCITE-5526:
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Summary: Handle unparsing of literals based on type system
Key: CALCITE-5526
URL: https://issues.apache.org/jira/browse/CALCITE-5526
Project: Calcite
Issue Type: Task
Reporter: Will Noble
[CALCITE-5424|https://issues.apache.org/jira/browse/CALCITE-5424] dealt with
parsing date/time literals via a custom type system, however there is still no
way to unparse them via the same type system. This is handled in
[SqlDialect.unparseDateTimeLiteral|https://github.com/apache/calcite/blob/a0e119ea42def418957f214f539469f1aba76c18/core/src/main/java/org/apache/calcite/sql/SqlDialect.java#L468]
which simply calls the literal object's {{toString()}} method.
The literal object (a subclass of {{SqlAbstractDateTimeLiteral}}) should not be
able to determine it's own unparsed representation by itself since it could be
unparsed in any dialect. Since the current system for resolving custom types
relies on access to the catalog, it appears we'll need to introduce to
{{SqlDialect}} a dependency on {{CalciteCatalogReader}} so it can use the same
mappings for unparsing as it does for parsing.
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