[jira] [Assigned] (CASSANDRA-10537) CONTAINS and CONTAINS KEY support for Lightweight Transactions

["Benjamin Lerer (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-10537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benjamin Lerer reassigned CASSANDRA-10537:
------------------------------------------

    Assignee: ROCHETEAU Antoine

> CONTAINS and CONTAINS KEY support for Lightweight Transactions
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-10537
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10537
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Legacy/CQL
>            Reporter: Nimi Wariboko Jr.
>            Assignee: ROCHETEAU Antoine
>            Priority: Normal
>              Labels: AdventCalendar2021, CQL, lhf
>             Fix For: 4.x
>
>
> Conditional updates currently do not support CONTAINS and CONTAINS KEY conditions. Queries such as 
> {{UPDATE mytable SET somefield = 4 WHERE pk = 'pkv' IF set_column CONTAINS 5;}}
> are not possible.
> Would it also be possible to support the negation of these (ex. testing that a value does not exist inside a set)?
> +Additional Information for newcomers:+
> Negation should not be supported as for the moment we do not support it within restrictions either.
> One way to approch this bug is to use test driven development. You can modify {{InsertUpdateIfConditionCollectionsTest}} to allow CONTAINS and CONTAINS KEY operators and go through the different failures.
> The following changes will need to be done.
> * The {{columnCondition}} rule from the ANTLR {{Parser.g}} file should be updated to accept {{containsOperator}}.
> * {{ColumnCondition.Raw#prepareTerms}} should be modified in the case where the operator is a CONTAINS or CONTAINS KEY as the {{receiver}} is not the collection but keys or values of the collection. Look at {{SingleColumnRelation#makeCollectionReceiver}}.
> * {{ColumnCollection.MultiCellCollectionBound#valueAppliesTo}} will need to be changed for {{Map}} and {{Set}} to process CONTAINS operators.  
>  



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