How can I get the schema when using StreamDecoder when the batches are empty?

[jwimberl]

The new StreamDecoder utility reads the arrow SchemaRef from a MessageHeader::Schema-type message into a private struct member named schema; however, there isn't a public method to retrieve this schema that I can see. When the data is empty and there are no batches, is there any way to still get the decoded SchemaRef?

[Jefffrey]

Issue has been raised for this feature: #6420

Will close this so any further discussion can be on the issue