[jira] [Created] (IGNITE-6293) SQL: Support FOREIGN KEY constraint

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

Vladimir Ozerov created IGNITE-6293:
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             Summary: SQL: Support FOREIGN KEY constraint
                 Key: IGNITE-6293
                 URL: https://issues.apache.org/jira/browse/IGNITE-6293
             Project: Ignite
          Issue Type: Task
          Components: sql
    Affects Versions: 2.1
            Reporter: Vladimir Ozerov


We need to support {{FOREIGN KEY}} constraint. This is a complex, though achievable thing.
1) We need to check constraint during inserts and updates (from both SQL and cache API). 
2) We need to support different modes of {{CASCADE}} actions - "remove", "set null". 

In general case it would require distributed operations, possibly with predicates. However, as a first iteration, it would be enough to support FK only for co-located data. In this case everything could be done locally.

*Important* 
Implementation of FK typically depends heavily on underlying MVCC and transaction subsystems. That said, we should implement it after MVCC and transactional SQL.



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