[jira] [Created] (CASSANDRA-8270) Allow sub slices for composites

["T Jake Luciani (JIRA)" <ji...@apache.org>]

T Jake Luciani created CASSANDRA-8270:
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             Summary: Allow sub slices for composites
                 Key: CASSANDRA-8270
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8270
             Project: Cassandra
          Issue Type: Improvement
            Reporter: T Jake Luciani
            Priority: Minor


For some queries with clustering keys it would be helpful to allow server side to avoid processing things you will simply filter out.

Example schema:

{code}
create TABLE foo (a text, b int, c int, d int, primary key(a, b, c));

insert into foo (a, b, c, d ) VALUES ( 'key', 2, 3, 4);
insert into foo (a, b, c, d ) VALUES ( 'key', 2, 4, 4);
insert into foo (a, b, c, d ) VALUES ( 'key', 3, 3, 4);
insert into foo (a, b, c, d ) VALUES ( 'key', 3, 4, 4);
{code}


{code}
   select count(*) from foo where a = 'key' and b = 2 and c > 3; --return 1
   select count(*) from foo where a = 'key' and b > 2 and c > 3; --error
   select count(*) from foo where a = 'key' and c > 3; --error
{code}

The first query is only possible because our slices only allow a fixed prefix but if we extended slices to include slices we could effectively request for:
b(2,*) c (3,*)
b (*,*) c (3,*)




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