dugenkui03 opened a new pull request #2158:
URL: https://github.com/apache/hudi/pull/2158
Two minor optimization for `Option`:
#### 1. Keep consistency with `map` method in `Optional`
Ensure `mapper` is not null, even `val` is null and `mapper` will not be
invoked.
#### 2. Rewrite `toString()` method
Code below will print same thing:
```java
System.out.println(Option.of("null").toString());
System.out.println(Option.empty().toString());
// Option{val=null}
// Option{val=null}
```
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