[jira] [Created] (FLINK-3921) StringParser not specifying encoding to use

[Shang Yuanchun (Jira)]

Tatu Saloranta created FLINK-3921:
-------------------------------------

             Summary: StringParser not specifying encoding to use
                 Key: FLINK-3921
                 URL: https://issues.apache.org/jira/browse/FLINK-3921
             Project: Flink
          Issue Type: Improvement
          Components: Core
    Affects Versions: 1.0.3
            Reporter: Tatu Saloranta
            Priority: Minor


Looking at default `TypeSerializer` instances I noticed what looks like a minor flaw, unless I am missing something.
Whereas all other array serializers indicate that type is not immutable (since in Java, arrays are not immutable), `StringArraySerializer` has:

```
        @Override
        public boolean isImmutableType() {
                return true;
        }
```

and I think it should instead return `false`. I could create a PR, but seems like a small enough thing that issue report makes more sense.
I tried looking for deps to see if there's a test for this, but couldn't find one; otherwise could submit a test fix.






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