A simple get on a document supports limiting fields with a FieldMask. However, there is no parity for this with a get on a transaction. This would be useful on a transactional get to minimize data transfer.
Thanks for the feature request! This would be helpful indeed, we do not consider this urgent and will add to our to-do list for the future. So maybe don't hold your breath :-)
A simple
get
on a document supports limiting fields with aFieldMask
. However, there is no parity for this with aget
on a transaction. This would be useful on a transactionalget
to minimize data transfer.