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https://issues.apache.org/jira/browse/CASSANDRA-10367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14875772#comment-14875772
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Robert Stupp commented on CASSANDRA-10367:
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Yes, it's possible to extend the List/Set/MapCodecs - but the codec instances
themselves are not. These are created programmatically in CodecRegistry (which
is {{final}} btw).
This would need some kind of "codec factory" to work.
I can intercept all calls to {{CodecRegistry.codecFor}} - but that's not what's
really needed, as a type like {{tuple<list<text>>}} wouldn't be caught at all.
[~omichallat]: Do you have an idea for this? I think the simplest (but maybe
that's just a hack) approach would be to make {{CodecRegistry}} non-final and
the {{maybeCreateCodec}} methods protected.
> Aggregate with Initial Condition fails with C* 3.0
> --------------------------------------------------
>
> Key: CASSANDRA-10367
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10367
> Project: Cassandra
> Issue Type: Bug
> Environment: Cassandra 3.0 branch
> https://github.com/apache/cassandra/tree/cassandra-3.0
> Reporter: Greg Bestland
> Assignee: Robert Stupp
> Fix For: 3.0.x
>
>
> I'm seeing some inconsistent behavior between 2.2 and 3.0 C* with regards to
> UDF, Aggregates and Initial Conditions. I have a scenario, which I think is
> valid. It works in C* 2.2 but not in 3.0
> Using the following user defined function
> {code:sql}
> CREATE OR REPLACE FUNCTION extend_list(s list<text>, i int)
> CALLED ON NULL INPUT
> RETURNS list<text>
> LANGUAGE java AS 'if (i != null)
> s.add(String.valueOf(i)); return s;';
> {code}
> With the aggregate below
> {code:sql}
> CREATE AGGREGATE aggregatemetadata.test_init_cond_aggregate(int) SFUNC
> extend_list STYPE list<text> INITCOND [ ]
> {code}
> When I attempt to exercise the aggregate on from a simple key value table.
> {code:sql}
> SELECT test_init_cond_aggregate(v) AS list_res FROM t
> {code}
> in 2.2 it works fine and returns the aggregate.
> The exact same test ran against the 3.0 branch produces the following
> exception from the server.
> {code:java}
> InvalidRequest: code=2200 [Invalid query] message="ERROR FUNCTION_FAILURE:
> execution of 'aggregatemetadata.extend_list[list<text>, int]' failed:
> java.lang.UnsupportedOperationException"
> {code}
> I've grepped through the C* logs but I couldn't find a more verbose stack
> trace, or any errors.
> Robert Stupp suggested I open a ticket.
> I am able to reproduce both in the python driver manually using cql.
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