[jira] [Created] (FLINK-3685) Logical error in code for DateSerializer deserialize with reuse

[Shang Yuanchun (Jira)]

ZhengBowen created FLINK-3685:
---------------------------------

             Summary: Logical error in code for DateSerializer deserialize with reuse
                 Key: FLINK-3685
                 URL: https://issues.apache.org/jira/browse/FLINK-3685
             Project: Flink
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.0
            Reporter: ZhengBowen


There is a logical error in the following function in DateSerializer.java when source read '-1'
function is:
```
public Date deserialize(Date reuse, DataInputView source) throws IOException {
        long v = source.readLong();
        if(v == -1L) {
                return null;
        }
        reuse.setTime(v);
        return reuse;
}
```
when call this function for first time, if return null, then 'reuse' will be set null by caller;
when call this function for second time,if 'v!=-1' ,reuse.setTime(v) will throw NPE.



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