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https://issues.apache.org/jira/browse/CASSANDRA-4084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239878#comment-13239878
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Tyler Hobbs commented on CASSANDRA-4084:
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After looking things over and getting Sylvain to explain it to me, I think I
understand. The behavior in 1.1 is, when using a composite comparator, to
apply the column validator to any column where the last component of the column
name matches the 'name' field of the ColumnDef.
> Better validator support for composite comparator CFs
> -----------------------------------------------------
>
> Key: CASSANDRA-4084
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4084
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Tyler Hobbs
> Priority: Minor
>
> Perhaps this should be part of replacing super columns with composites, but
> we essentially need something analogous to sub-column validators for when
> composites are used in a way that's similar to super columns (multiple fields
> for each "super column" in a row). As an example use case, suppose you have
> a wide row holding users where the comparator is (<user_id>, <field>), and
> <field> might be either "name" or "age"; ideally, you can validate "name" as
> UT8Type and "age" as IntegerType.
> Allowing wildcards to be used for components in the column name portion of
> the ColumnDef might be a reasonable approach.
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