Description
CASSANDRA-5484 introduced CREATE CUSTOM INDEX syntax for custom 2i and CASSANDRA-5576 will add CQL3 support for creating/dropping triggers (CREATE TRIGGER <name> ON <table> USING <classname>). For consistency' sake, CREATE CUSTOM INDEX should be updated to also use 'USING' keyword, e.g. CREATE CUSTOM INDEX ON <table>(<column>) USING <classname>.