[jira] [Created] (CASSANDRA-14182) Sub-range selection for non-frozen collections should return null instead of empty

["Benjamin Lerer (JIRA)" <ji...@apache.org>]

Benjamin Lerer created CASSANDRA-14182:
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             Summary: Sub-range selection for non-frozen collections should return null instead of empty
                 Key: CASSANDRA-14182
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14182
             Project: Cassandra
          Issue Type: Bug
            Reporter: Benjamin Lerer
            Assignee: Benjamin Lerer


For non frozen collections, Cassandra cannot differentiate an empty collection from a {{null}} one. Due to that Cassandra returns always {{null}} for non-frozen empty collection.

When selecting a sub range from a non-frozen collection, if the range does not contains any data an empty collection will be returned. It is counter intuitive and a {{null}} value should be returned instead.
 
{code:sql}
CREATE TABLE IF NOT EXISTS t (k int PRIMARY KEY, v set<int>);

INSERT INTO t (k, v) VALUES (1, {});
SELECT v FROM t; -- null
SELECT v[1] FROM t; -- null
SELECT v[1..] FROM t; -- null

INSERT INTO t (k, v) VALUES (1, {0});
SELECT v FROM t; -- {0}
SELECT v[1] FROM t; -- null
SELECT v[1..] FROM t; -- {}
{code}



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