Fix views when CAST NULL

[ssheikin]

Redshift JDBC driver returns Invalid VARCHAR length -5 for column type during select from view created as:

CREATE VIEW test_view AS SELECT CAST(NULL AS CHARACTER VARYING) AS value

According to Postgres documentation:
atttypmod int4
atttypmod records type-specific data supplied at table creation time (for example, the maximum length of a varchar column). It is passed to type-specific input functions and length coercion functions. The value will generally be -1 for types that do not need atttypmod.

Seems Redshift JDBC driver uses that in a wrong way - atttypmod is not applicable for null.

Description

Fix not possible length for varchar.

Motivation and Context

Testing

CREATE VIEW test_view AS SELECT CAST(NULL AS CHARACTER VARYING) AS value;

select * from test_view;

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have read the README document
• I have added tests to cover my changes
• All new and existing tests passed
• A short description of the change has been added to the CHANGELOG

License

• By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[ssheikin]

@bhvkshah @Brooke-white @iggarish @hyandell Could you please take a look on this PR?

[bhvkshah]

@ssheikin will have an update for you once I've reviewed your changes. Thank you for the PR!

[wendigo]

@bhvkshah any update on that PR?

[Brooke-white]

thank you @ssheikin ! looks good :)

[ssheikin]

Thank you @Brooke-white @bhvkshah for merging!
When we can expect the new release with the fix?