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Posted to issues@ignite.apache.org by "Andrey Mashenkov (Jira)" <ji...@apache.org> on 2021/12/14 09:03:00 UTC

[jira] [Created] (IGNITE-16115) Implement getNullable and getOrDefault operations.

Andrey Mashenkov created IGNITE-16115:
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             Summary: Implement getNullable and getOrDefault operations.
                 Key: IGNITE-16115
                 URL: https://issues.apache.org/jira/browse/IGNITE-16115
             Project: Ignite
          Issue Type: Improvement
            Reporter: Andrey Mashenkov


It is allowed to map an object to a single nullable column, which makes 'null' values legal in the KeyValue view.
Once the 'null' value is possible there is no way to distinguish, if there is no row in a table for the given key, or the row exists and the mapped column contains the 'null' value.

Let's introduce NullableValue class-wrapper for a value and implement getNullable, and getOrDefault methods for that purpose.
The first is useful for cases, when it's not possible to use a "default", but creates an additional wrapper. 



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