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https://issues.apache.org/jira/browse/CASSANDRA-11114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15293927#comment-15293927
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Alex Petrov commented on CASSANDRA-11114:
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I've also changed the wording a bit:
.bq Other columns are free from those restrictions (no validation of existing
data is performed), but it is usually a bad idea to change the type to a
non-compatible one, unless no data have been inserted for that column yet, as
this could confuse CQL drivers/tools.
is now:
.bq To change the type of a column, the column must already exist in type
definition and its type should be compatible with the new type. The
compatibility table is available below.
As previously it sounded as if the {{ALTER TABLE}} statement would actually
succeed for those types. Although since it's going to succeed only in case when
types are compatible (or same), the reference to the compatibility table is
added.
I've triggered a CI just to make sure that the newly written tests are working:
|[trunk|https://github.com/ifesdjeen/cassandra/commits/11114-trunk]|[utest|https://cassci.datastax.com/view/Dev/view/ifesdjeen/job/ifesdjeen-11114-trunk-testall/]|
> Document which type conversions are allowed
> -------------------------------------------
>
> Key: CASSANDRA-11114
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11114
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL, Documentation and Website
> Reporter: Sylvain Lebresne
> Assignee: Giampaolo
> Priority: Minor
> Labels: doc-impacting, lhf
> Attachments: cassandra-11114-trunk.patch
>
>
> We allow only some type conversion through {{ALTER TABLE}} and type casts,
> the ones that don't break stuff, but we don't currently document which ones
> those are. We should add it to
> http://cassandra.apache.org/doc/cql3/CQL-3.0.html.
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