asereda-gs commented on pull request #2531:
URL: https://github.com/apache/calcite/pull/2531#issuecomment-925188499
> Does `Immutables` have a mode where it generates copy-on-write beans (with
`with` methods) as opposed to builders? That's the crux of the problem here.
Yes. ImmutableBean will have `with` method which acts as copy-on-write.
> Is there anything in `Immutables` that converts a bean into a builder
(with the same property values)? That will be necessary.
One can use `from()` method of a builder:
```java
ImmutableBean.builder()
.from(other) // merges attribute value into builder
.value("foo")
.build();
```
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