[jira] [Assigned] (CALCITE-4085) Improve nullability support for fields of structured type

["Stamatis Zampetakis (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-4085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stamatis Zampetakis reassigned CALCITE-4085:
--------------------------------------------

    Assignee: Dawid Wysakowicz

> Improve nullability support for fields of structured type
> ---------------------------------------------------------
>
>                 Key: CALCITE-4085
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4085
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Dawid Wysakowicz
>            Assignee: Dawid Wysakowicz
>            Priority: Major
>
> As discussed in https://lists.apache.org/thread.html/r602ac95fff23dd1ef974fb396df7be061ab861384ec42f5c57ce0bc2%40%3Cdev.calcite.apache.org%3E I would like to change the way a type of a field of a record is derived at couple of locations. This helps frameworks such as Apache Flink to build support for nullable records with not null fields.
> I suggest to change:
> * SqlDotOperator#deriveType
> * SqlItemOperator#inferReturnType
> * AliasNamespace#validateImpl
> * RexBuilder#makeFieldAccessInternal
> * SqlValidatorImpl.DeriveTypeVisitor#visit(SqlIdentifier)



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