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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 updated CASSANDRA-19341:
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Status: Ready to Commit (was: Review In Progress)
> Relation and Restriction hierarchies 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
> Fix For: 5.x
>
> Time Spent: 32.5h
> Remaining Estimate: 0h
>
> 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
> surgical 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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