lquerel opened a new issue, #34186:
URL: https://github.com/apache/arrow/issues/34186
### Describe the enhancement requested
The signature of `MapType` constructor is `func MapOf(key, item DataType)
*MapType`. The field `MapType.value` is private and the pointer returned by
`MapType.ValueType` doesn't give access to the fields of the underlying
`StructType`.
I propose to add an additional constructor to specificy these metadata with
the following signature:
```go
func MapOfWithMetadata(
keyDT DataType,
keyMetadata Metadata,
valueDT DataType,
valueMetadata Metadata,
) *MapType
```
### Component(s)
Go
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