[jira] [Created] (KAFKA-15768) StateQueryResult#getOnlyPartitionResult should not throw for FailedQueryResult

["Matthias J. Sax (Jira)" <ji...@apache.org>]

Matthias J. Sax created KAFKA-15768:
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             Summary: StateQueryResult#getOnlyPartitionResult should not throw for FailedQueryResult
                 Key: KAFKA-15768
                 URL: https://issues.apache.org/jira/browse/KAFKA-15768
             Project: Kafka
          Issue Type: Bug
          Components: streams
            Reporter: Matthias J. Sax


Calling `StateQueryResult#getOnlyPartitionResult` crashes with an incorrect `IllegalArgumentException` if the only result is a `FailedQueryResult`.

The issue is the internal `filter(r -> r.getResult() != 0)` step, that blindly (and incorrectly) calls `getResult`.

Given the semantics of `getOnlyPartitionResult` we should not care if the result is SuccessQueryResult or FailedQueryResult, but only check if there is a single result or not. (The user has not means to avoid getting an exception otherwise.)

Side-note: why does `FailedQueryResult#getResult` throw an IllegalArgumentException (there is no argument passed into the method – it should rather be an `IllegalStateException` – but I guess we would need a KIP for this fix?)



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