[jira] [Created] (CASSANDRA-12611) Allow UDFs to be used in predicates

["Jon Haddad (JIRA)" <ji...@apache.org>]

Jon Haddad created CASSANDRA-12611:
--------------------------------------

             Summary: Allow UDFs to be used in predicates
                 Key: CASSANDRA-12611
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12611
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Jon Haddad


Now that allow filtering can be used more liberally, it would be nice to be able to apply a function as a predicate.  For instance, if I store a bloom filter on each row, it would be useful to be able to pass a value and a field into a function to check if the value is possibly in the set of values the bloom filter has seen.  For example:

    CREATE OR REPLACE FUNCTION inBloom (input int, field field) CALLED ON NULL INPUT RETURNS boolean LANGUAGE java AS 'return true;'; // pretend this actual evaluates correctly 

 As far as I can tell, there's no way to pass inputs to a function referencing a field, and no way to use the result of the function in a predicate.  The following simple example fails:

    cqlsh:tutorials> CREATE OR REPLACE FUNCTION inBloom (input int) CALLED ON NULL INPUT RETURNS boolean LANGUAGE java AS 'return true;';
    cqlsh:tutorials> select * from user where inBloom(1) = True;
SyntaxException: line 1:32 no viable alternative at input '(' (select * from user where [inBloom](...)




--
This message was sent by Atlassian JIRA
(v6.3.4#6332)