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https://issues.apache.org/jira/browse/CASSANDRA-3657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192266#comment-13192266
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Nate McCall commented on CASSANDRA-3657:
----------------------------------------
Comparison works via the unit tests, but it looks like validation does not.
Given a column family with the following definition:
{code}
create column family CountryStateCity
with comparator = 'CompositeType(UTF8Type,UTF8Type,UTF8Type)'
and key_validation_class = 'UTF8Type'
and default_validation_class = 'UTF8Type';
{code}
Inserting data with a Composite structured like the following causes a
validation error from CompositeType#validateNextComparator:
'CompositeType(UTF8Type,UTF8Type,UTF8Type,LongType)'
> Allow extending CompositeType comparator
> ----------------------------------------
>
> Key: CASSANDRA-3657
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3657
> Project: Cassandra
> Issue Type: New Feature
> Components: API, Core
> Affects Versions: 0.8.1
> Reporter: Jonathan Ellis
> Assignee: Sylvain Lebresne
> Priority: Critical
> Fix For: 1.1
>
> Attachments: 0001-Allow-compatible-comparator-changes.patch
>
>
> Quoting Sylvain from CASSANDRA-2474,
> bq. if you declare a comparator like CompositeType(IntType, UUIDType,
> UTF8Type), you can have columns that have only some prefix of the component
> (typically '42:92d21d0a-d6cb-437c-9d3f-b67aa733a19f' is a valid column name
> for that comparator), and as a consequence it would be possible to allow
> 'extend' the preceding comparator to say CompositeType(IntType, UUIDType,
> UTF8Type, IntType)
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