Jon Haddad created CASSANDRA-12611:
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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](...)
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