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https://issues.apache.org/jira/browse/CALCITE-2464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16721432#comment-16721432
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Stamatis Zampetakis commented on CALCITE-2464:
----------------------------------------------
Since at the moment structured types are always not nullable there are various
problems. A simple example that currently does not work and it should work is
the following.
{code:sql}
CREATE TABLE Contacts (
name VARCHAR(20) NOT NULL,
address Address); -- Address structured type is nullable
INSERT INTO Contacts VALUES ('Stamatis', null);
SELECT name FROM Contacts WHERE address IS NULL;
{code}
> 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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