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https://issues.apache.org/jira/browse/CALCITE-672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14483871#comment-14483871
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Julian Hyde commented on CALCITE-672:
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Because there is a bug in SqlUnresolvedFunction.inferReturnType.
RelDataTypeFactory is doing what was asked of it.
> SQL "any" type should be created as nullable in RelDataTypeFactory.
> --------------------------------------------------------------------
>
> Key: CALCITE-672
> URL: https://issues.apache.org/jira/browse/CALCITE-672
> Project: Calcite
> Issue Type: Bug
> Reporter: Jinfeng Ni
> Assignee: Julian Hyde
>
> Calcite uses SQL "any" type internally, when the type of an Rex expression is
> not known precisely. By its name, "any" could mean nullable type, or
> non-nullable type. Therefore, it makes sense to create SQL "any" type as
> nullable type.
> However, in the Calcite code, the nullability of "any" type is not set
> consistently. For example, the SqlItemOperator would set "any" as nullable,
> while SqlUnresolvedFunction will set "any" as non-nullable.
> SQL "any" type is used extensively in Schema-less system like Drill, since
> the exact SQL type would be determined in run-time only. Having an
> inconsistent nullability through Calcite library will cause issues for a
> schema-less system.
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