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https://issues.apache.org/jira/browse/CALCITE-4872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Will Noble updated CALCITE-4872:
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Summary: UNKNOWN SqlTypeName erroneously treated as NULL (was: UNKNOWN
erroneously treated as NULL)
> UNKNOWN SqlTypeName erroneously treated as NULL
> -----------------------------------------------
>
> Key: CALCITE-4872
> URL: https://issues.apache.org/jira/browse/CALCITE-4872
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Will Noble
> Assignee: Will Noble
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Call {{createWithNullability}} on an {{UnknownSqlType}} currently returns a
> {{NULL}} type. Furthermore, it's impossible to cast to unknown types,
> according to {{SqlTypeUtil.canCastFrom}}. This introduces a new
> {{SqlTypeName}} -- {{UNKNOWN}} -- which behaves like {{NULL}} in all ways
> except that it's no longer actually equal to {{NULL}}, and can always be cast
> to.
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