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https://issues.apache.org/jira/browse/CASSANDRA-9321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14535297#comment-14535297
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Tyler Hobbs commented on CASSANDRA-9321:
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Tests look good (no regressions), +1.
> Aggregate UDFs allow SFUNC return type to differ from STYPE if FFUNC specified
> ------------------------------------------------------------------------------
>
> Key: CASSANDRA-9321
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9321
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Zachary Kurey
> Assignee: Robert Stupp
> Fix For: 3.0
>
> Attachments: 9321.txt
>
>
> When a final function is specified in an aggregate C* allows the return type
> of the state function to not match the state type.
> Allowing the mismatch if a final function is specified seems to be
> intentional as if you don't provide a final function and you provide a state
> function with a return type that doesn't match the state type, then C* gives
> you an error that states that they must match "unless a final function is
> specified".
> It seems incorrect regardless of whether or not a final function is present
> to allow the state functions return type to vary from state type. And indeed
> if you do so it produces an error when you try to use the aggregate.
> Here is a simple example that shows the problem:
> {code}
> CREATE OR REPLACE FUNCTION state_func(state int, p2 int)
> RETURNS double LANGUAGE java AS 'return Double.valueOf(1.0);';
> CREATE OR REPLACE FUNCTION final_func(state int)
> RETURNS int
> LANGUAGE java
> AS 'return Integer.valueOf(1);';
> CREATE OR REPLACE AGGREGATE my_aggregate( int )
> SFUNC state_func
> STYPE int
> FINALFUNC final_func
> INITCOND 1;
> SELECT my_aggregate(column) FROM table;
> {code}
> The select produces the error:
> {noformat}
> Aggregate 'ks.my_aggregate : (int) -> int' exists but hasn't been loaded
> successfully for the following reason: Referenced state function
> 'ks.state_func [double, int]' for aggregate 'ks.my_aggregate' does not exist.
> {noformat}
> I was reproducing this with 3.0 trunk, though now I just grabbed the latest
> and there is an NPE instead of the error above:
> {noformat}
> java.lang.NullPointerException: at index 1
> at
> com.google.common.collect.ObjectArrays.checkElementNotNull(ObjectArrays.java:240)
> ~[guava-16.0.jar:na]
> at
> com.google.common.collect.ImmutableSet.construct(ImmutableSet.java:195)
> ~[guava-16.0.jar:na]
> at com.google.common.collect.ImmutableSet.of(ImmutableSet.java:116)
> ~[guava-16.0.jar:na]
> at
> org.apache.cassandra.cql3.functions.UDAggregate.getFunctions(UDAggregate.java:110)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.selection.AbstractFunctionSelector$1.getFunctions(AbstractFunctionSelector.java:78)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.selection.SelectorFactories.getFunctions(SelectorFactories.java:105)
> ~[main/:na]
> {noformat}
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