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https://issues.apache.org/jira/browse/IGNITE-16115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17477402#comment-17477402
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Andrey N. Gura edited comment on IGNITE-16115 at 1/17/22, 8:54 PM:
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[~amashenkov] Yes, we should add methods like `getNullableAndXxx()`. `getAll`
result could be used with `getOrDefault` and `contains` so using
`NullableValue` in the returned map looks redundant.
was (Author: agura):
[~amashenkov] Yes, we should add methods like `getNullableAndXxx()`. `getAll`
result could be used with `getOrDefault` and `contains` so using
`NullableValue` in the returned map is redundant.
> 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
> Assignee: Andrey Mashenkov
> Priority: Major
> Labels: ignite-3
> Fix For: 3.0.0-alpha5
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> 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()}} + bulk methods.
> {{getNullable()}} is useful for cases, when it's not possible to use a
> "default", but creates an additional wrapper.
> Also, the KeyValueView.get(key) method behavior should be changed:
> * return {{null}} if the table has no row for the key.
> * return a non-null value for the key.
> * fail with a suggestion to use a getNullable, if a {{null}} value returned
> for the key to avoid ambiguity.
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