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https://issues.apache.org/jira/browse/CALCITE-4099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17155005#comment-17155005
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Julian Hyde commented on CALCITE-4099:
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Maybe they should be brought into {{ReturnTypeInference}}.
I know that {{ReturnTypeInference}} only says whether the return MAY be null,
whereas {{Strong.Policy}} and {{NullPolicy}} says when it MUST be null and MUST
NOT be null (based on runtime values). But still, if {{ReturnTypeInference}}
knows the {{NullPolicy}} is {{STRICT}}
(for example) then the nullability of the return is fully determined by the
arguments.
> Unify Strong.Policy and NullPolicy
> ----------------------------------
>
> Key: CALCITE-4099
> URL: https://issues.apache.org/jira/browse/CALCITE-4099
> Project: Calcite
> Issue Type: Task
> Components: core
> Reporter: Ruben Q L
> Priority: Minor
>
> (discussion about this ticket started in CALCITE-4094)
> {{Strong.Policy}} and {{NullPolicy}} are two different enum that represent
> grosso-modo the same thing. The former is mostly used on the simplifier, and
> the latter on the code generation.
> To be studied if we could unify both entities and make it available through
> the SqlOperator.
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