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https://issues.apache.org/jira/browse/CASSANDRA-10537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Lerer updated CASSANDRA-10537:
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Complexity: Low Hanging Fruit
Mentor: Benjamin Lerer
> 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.
> Priority: Normal
> Labels: CQL
> 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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