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https://issues.apache.org/jira/browse/CASSANDRA-19341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Lerer reassigned CASSANDRA-19341:
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    Assignee: Benjamin Lerer

> Relation and Restriction hierachies are too complex and error prone
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-19341
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-19341
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL/Interpreter
>            Reporter: Benjamin Lerer
>            Assignee: Benjamin Lerer
>            Priority: Normal
>
> The {{Relation}} and {{Restriction}} hierarchy have been designed when C* was 
> only supporting a limited amount of operators and columns expressions (single 
> column, multi-column and token expressions). Over time they have grown in 
> complexity making the code harder to understand and modify and error prone. 
> Their design is also resulting in unnecessary limitations that could be 
> easily lifted, like the ability to accept different predicates on the same 
> column.
> Today adding a new operator requires the addition of a lot of glue code and 
> chirurgical changes accross the CQL layer. Making patch for features such as 
> CASSANDRA-18584 much complex than it should be.
> The goal of this ticket is to simplify the {{Relation}} and {{Restriction}} 
> hierarchies and modify operator  class so that adding new operators requires 
> only changes to the {{Operator}} class and ANTLR file.           



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