[jira] [Updated] (IGNITE-15483) Uniq index detection.

["Andrey Mashenkov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-15483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrey Mashenkov updated IGNITE-15483:
--------------------------------------
    Fix Version/s: 3.0

> Uniq index detection.
> ---------------------
>
>                 Key: IGNITE-15483
>                 URL: https://issues.apache.org/jira/browse/IGNITE-15483
>             Project: Ignite
>          Issue Type: Improvement
>          Components: sql
>            Reporter: Andrey Mashenkov
>            Priority: Major
>              Labels: ignite-3
>             Fix For: 3.0
>
>
> Uniq index constraint support is very limited due to performance issues in the general case.
> Uniq index must contain all affinity columns, in this case, uniqueness achieves out of the box and costs nothing.
> Uniq flag is very useful in query planning, as we may rely on the fact the unique index lookup will always return a single row.
> Maybe, it is not a good idea to allow users to configure index "uniq" flag manually. (this is discussable)
> But we can detect unique index and set the flag automatically.



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