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https://issues.apache.org/jira/browse/CASSANDRA-11064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15144550#comment-15144550
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Sylvain Lebresne commented on CASSANDRA-11064:
----------------------------------------------
ping [~snazy]: did the potential reason for the handling of empty collections
came back to you? It would be nice to get this resolved and as said above, I'm
decently confident that empty BBs for collections should be invalid (since they
don't {{validate()}} :)).
> Failed aggregate creation breaks server permanently
> ---------------------------------------------------
>
> Key: CASSANDRA-11064
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11064
> Project: Cassandra
> Issue Type: Bug
> Reporter: Olivier Michallat
> Assignee: Robert Stupp
> Fix For: 3.0.x
>
>
> While testing edge cases around aggregates, I tried the following to see if
> custom types were supported:
> {code}
> ccm create v321 -v3.2.1 -n3
> ccm updateconf enable_user_defined_functions:true
> ccm start
> ccm node1 cqlsh
> CREATE FUNCTION id(i 'DynamicCompositeType(s => UTF8Type, i => Int32Type)')
> RETURNS NULL ON NULL INPUT
> RETURNS 'DynamicCompositeType(s => UTF8Type, i => Int32Type)'
> LANGUAGE java
> AS 'return i;';
> // function created successfully
> CREATE AGGREGATE ag()
> SFUNC id
> STYPE 'DynamicCompositeType(s => UTF8Type, i => Int32Type)'
> INITCOND 's@foo:i@32';
> ServerError: <ErrorMessage code=0000 [Server error]
> message="java.lang.RuntimeException: java.util.concurrent.ExecutionException:
> org.apache.cassandra.exceptions.SyntaxException: Failed parsing CQL term:
> [s@foo:i@32] reason: SyntaxException line 1:1 no viable alternative at
> character '@'">{code}
> Despite the error, the aggregate appears in system tables:
> {code}
> select * from system_schema.aggregates;
> keyspace_name | aggregate_name | ...
> ---------------+----------------+ ...
> test | ag | ...
> {code}
> But you can't drop it, and trying to drop its function produces the server
> error again:
> {code}
> DROP AGGREGATE ag;
> InvalidRequest: code=2200 [Invalid query] message="Cannot drop non existing
> aggregate 'test.ag'"
> DROP FUNCTION id;
> ServerError: <ErrorMessage code=0000 [Server error]
> message="java.lang.RuntimeException: java.util.concurrent.ExecutionException:
> org.apache.cassandra.exceptions.SyntaxException: Failed parsing CQL term:
> [s@foo:i@32] reason: SyntaxException line 1:1 no viable alternative at
> character '@'">
> {code}
> What's worse, it's now impossible to restart the server:
> {code}
> ccm stop; ccm start
> org.apache.cassandra.exceptions.SyntaxException: Failed parsing CQL term:
> [s@foo:i@32] reason: SyntaxException line 1:1 no viable alternative at
> character '@'
> at
> org.apache.cassandra.cql3.CQLFragmentParser.parseAny(CQLFragmentParser.java:48)
> at org.apache.cassandra.cql3.Terms.asBytes(Terms.java:51)
> at
> org.apache.cassandra.schema.SchemaKeyspace.createUDAFromRow(SchemaKeyspace.java:1225)
> at
> org.apache.cassandra.schema.SchemaKeyspace.fetchUDAs(SchemaKeyspace.java:1204)
> at
> org.apache.cassandra.schema.SchemaKeyspace.fetchFunctions(SchemaKeyspace.java:1129)
> at
> org.apache.cassandra.schema.SchemaKeyspace.fetchKeyspace(SchemaKeyspace.java:897)
> at
> org.apache.cassandra.schema.SchemaKeyspace.fetchKeyspacesWithout(SchemaKeyspace.java:872)
> at
> org.apache.cassandra.schema.SchemaKeyspace.fetchNonSystemKeyspaces(SchemaKeyspace.java:860)
> at org.apache.cassandra.config.Schema.loadFromDisk(Schema.java:125)
> at org.apache.cassandra.config.Schema.loadFromDisk(Schema.java:115)
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:229)
> at
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:551)
> at
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:680)
> {code}
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