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Posted to issues@calcite.apache.org by "Stamatis Zampetakis (JIRA)" <ji...@apache.org> on 2018/12/13 18:38:00 UTC

[jira] [Updated] (CALCITE-2464) Allow to set nullability for columns of structured types

     [ https://issues.apache.org/jira/browse/CALCITE-2464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stamatis Zampetakis updated CALCITE-2464:
-----------------------------------------
    Summary: Allow to set nullability for columns of structured types  (was: Struct types are always not nullable)

> Allow to set nullability for columns of structured types
> --------------------------------------------------------
>
>                 Key: CALCITE-2464
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2464
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.17.0
>            Reporter: Stamatis Zampetakis
>            Assignee: Julian Hyde
>            Priority: Major
>
> Struct types are always not nullable. This can lead to bugs in many parts of Calcite (e.g., expression simplification, optimization, code generation) that are considering the nullability of a RelDataType. 
> The method [isNullable|https://github.com/apache/calcite/blob/3c6b5ec759caadabb67f09d7a4963cc7d9386d0c/core/src/main/java/org/apache/calcite/rel/type/RelRecordType.java#L55] in the RelRecordType, which is used to represent a structured type, always returns false. The nullability of the RelRecordType should be a parameter in the constructor as it is the case for various other RelDataTypes. 
> Additionally, the data type cache should also take into account the nullability of the type in order to return a correct equivalent.



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