Sylvain Lebresne created CASSANDRA-7526:
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Summary: Allow defining UDFs directly from CQL
Key: CASSANDRA-7526
URL: https://issues.apache.org/jira/browse/CASSANDRA-7526
Project: Cassandra
Issue Type: New Feature
Reporter: Sylvain Lebresne
In CASSANDRA-7395 we'll introduce the ability to define user functions by
dropping a java class server side. While this is a good first step and a good
option to have in any case, it would be nice to provide a simpler way to define
those functions directly from CQL. And while we probably don't want to
re-invent a new programming language inside CQL, we can reuse one. Typically,
with java 8, we could use nashorn. This would allow a syntax along the lines of:
{noformat}
CREATE FUNCTION sum (a bigint, b bigint) bigint AS { return a + b; }
{noformat}
Note that in this, everything before the AS will be parsed by us, which we'll
probably want because we'll probably need to have the types of arguments/return
in practice anyway, and it's a good idea to reuse CQL types. The expression
after the AS will be given to Nashorn however.
Please note that in theory we could ultimately support multiple language after
the AS. However, I'd like to focus on supporting just one for this ticket and
I'm keen on using javascript through Nashorn because as it's the one that will
ship with java from now on, it feels like a safe default.
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