[jira] [Created] (FLINK-11075) Remove redundant code path in CompatibilityUtil

[Shang Yuanchun (Jira)]

Tzu-Li (Gordon) Tai created FLINK-11075:
-------------------------------------------

             Summary: Remove redundant code path in CompatibilityUtil
                 Key: FLINK-11075
                 URL: https://issues.apache.org/jira/browse/FLINK-11075
             Project: Flink
          Issue Type: Improvement
          Components: Type Serialization System
            Reporter: Tzu-Li (Gordon) Tai
            Assignee: Tzu-Li (Gordon) Tai
             Fix For: 1.8.0


In {{CompatibilityUtil#resolveCompatibilityResult}}:

```

CompatibilityResult<T> initialResult = resolveCompatibilityResult(
    (TypeSerializerSnapshot<T>) precedingSerializerConfigSnapshot,
    newSerializer);

if (!initialResult.isRequiresMigration()) {
    return initialResult;
} else {
    if (precedingSerializer != null && !(precedingSerializer.getClass().equals(dummySerializerClassTag))) {
    // if the preceding serializer exists and is not a dummy, use
    // that for converting instead of any provided convert deserializer
    return CompatibilityResult.requiresMigration((TypeSerializer<T>) precedingSerializer);
 } else {
    // requires migration (may or may not have a convert deserializer)
    return initialResult;
 }
```

{{initialResult}} can actually be returned already, since the case where we try to provide a convert deserializer is no longer relevant. We do not need to check if a convert deserializer is provided because that will never be the case.



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