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From "Nate McCall (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3657) Allow extending CompositeType comparator
Date Tue, 24 Jan 2012 16:42:41 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192266#comment-13192266
] 

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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