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Sylvain Lebresne commented on CASSANDRA-4041:
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There is 2 things we can support here:
# Allow to modify the type of a given component of the comparator (say change
UTF8Type to BytesType). For that, we'll probably just want to reuse the 'ALTER
TABLE foo ALTER x TYPE blob' syntax.
# Allow adding more components to the composite comparator. Not sure what is
the best syntax for that but I would suggest something like 'ALTER TABLE foo
EXTEND PRIMARY KEY WITH x int' to express we are really modifying the existing
definition rather than setting a new one. That being said, given that this part
will work only for compact composite table definition, which are supposed to be
here for backward compatibility mostly, I wouldn't shed a tear if we don't
support that at all.
> Allow updating column_alias types
> ---------------------------------
>
> Key: CASSANDRA-4041
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4041
> Project: Cassandra
> Issue Type: Sub-task
> Components: API
> Reporter: Sylvain Lebresne
> Assignee: Pavel Yaskevich
> Priority: Minor
> Fix For: 1.1.2
>
>
> CASSANDRA-3657 has added the ability to change comparators (including parts
> of a compositeType) when compatible. The code of CQL3 forbids it currently
> however so we should lift that limitation.
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