kou commented on issue #47101:
URL: https://github.com/apache/arrow/issues/47101#issuecomment-3110199079
We don't want to use Boost as much as possible... It's difficult to
maintain...
```cpp
ValueType v;
ValueTypeSubset v1 = int64_t{1};
// Compile-time error
/* v = v1; */
```
Is this part correct? `ValueTypeSubset v1 = v;` not `ValueTypeSubset v1 =
int64_t{1};`?
Why do we want to use `v1 = v`? (I don't understand why we need to convert a
subset value to a superset value.)
Do you have more concrete example?
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