Will Noble created CALCITE-4872:
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Summary: UNKNOWN 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
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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