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https://issues.apache.org/jira/browse/CALCITE-4226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17191162#comment-17191162
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Julian Hyde commented on CALCITE-4226:
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bq. you asked to keep the exiting function as is, and I did exactly that!
No, I said "The behavior you describe is intended behavior. I see no reason to
change it." You added another mode of operation, and therefore made the class
more complicated.
> Add Mappings#asListNonNull as a null-safe alternative for Mappings#asList
> -------------------------------------------------------------------------
>
> Key: CALCITE-4226
> URL: https://issues.apache.org/jira/browse/CALCITE-4226
> Project: Calcite
> Issue Type: Sub-task
> Components: core
> Affects Versions: 1.25.0
> Reporter: Vladimir Sitnikov
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.26.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> It looks like none of the uses for Mappings#asList is ready to handle nulls.
> So far there are 6 usages of the method, however, it is puzzling if NPE is
> expected behavior there.
> I'm inclined to create two variations of the method:
> 1) {{List<@Nullable Integer> asList(...)}} -- keep the current method current
> one
> 2) {{List<@NonNull Integer> asList(...)}} -- throw exceptions on invalid
> mappings
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