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https://issues.apache.org/jira/browse/CASSANDRA-5141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573352#comment-13573352
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Sylvain Lebresne commented on CASSANDRA-5141:
---------------------------------------------
In Cassandra, an empty map/set/list is equivalent to the column being null. In
other words a collection only exists if it has elements. The reason for that
semantic (versus having null being different from empty) is honestly mainly
dictated by implementation concerns (internally a collection *does not* indeed
exist unless it has elements). I.e. it's not because we think it is
intrinsically better that way, but it is also true that, at least as far as I'm
concern, I don't think it is intrinsically worst that way either.
> Can not insert an empty map.
> -----------------------------
>
> Key: CASSANDRA-5141
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5141
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Krzysztof Cieslinski Cognitum
> Assignee: Sylvain Lebresne
> Priority: Minor
> Fix For: 1.2.1
>
> Attachments: 5141.txt
>
>
> It is not possible to insert an empty map. It looks like the "{}" is reserved
> only for Set.
> So when for table:
> {code}
> CREATE TABLE users (
> id text PRIMARY KEY,
> surname text,
> favs map<text, text>
> )
> {code}
> I try to insert map without any elements:
> {code}
> cqlsh:test> insert into users(id,surname,favs) values('aaa','aaa',{});
> {code}
> I get:
> {code}
> Bad Request: Set operations are only supported on Set typed columns, but
> org.apache.cassandra.db.marshal.MapType(org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.UTF8Type)
> given.
> text could not be lexed at line 1, char 63
> {code}
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