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https://issues.apache.org/jira/browse/CASSANDRA-20982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18033924#comment-18033924
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Andres de la Peña commented on CASSANDRA-20982:
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{quote}[~adelapena] what is the motivation behind that first sentence in the
second paragraph you wrote in the above comment? - "it should be possible to
make blob columns from frozen collections."
{quote}
IIRC I meant that frozen multi-value types are serialized as a single blob,
whereas non-frozen multi-value types are multi-cell and don't have a clear
representation as a single blob. They are rather a series of blobs spread
across multiple cells, sometimes in the values of those cells, sometimes in the
names, sometimes both. But I guess the casting functions could produce and
consume the type of representation that is used for their frozen equivalents?
> BytesType should only be compatible with simple scalar types
> ------------------------------------------------------------
>
> Key: CASSANDRA-20982
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20982
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Cluster/Schema
> Reporter: Brandon Williams
> Assignee: Mikołaj
> Priority: Normal
> Fix For: 4.0.x, 4.1.x, 5.0.x, 5.x
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> Discovered while backporting CASSANDRA-18760, see
> https://github.com/datastax/cassandra/commit/b5f7d239ce92db7d9c5f79c69cad0caea67fcb23
> Basically, things like
> https://github.com/apache/cassandra/blob/trunk/test/unit/org/apache/cassandra/cql3/validation/operations/AlterTest.java#L71
> shouldn't be allowed to pass, because converting a frozen collection to
> bytes allows reading the raw bytes, which is nonsensical.
> This was found because the AbstractTypeTest is beefed up
> [here|https://github.com/datastax/cassandra/blob/main/test/unit/org/apache/cassandra/db/marshal/AbstractTypeTest.java]
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