How to change schema of a Dataset created through the Streams API?

I've used the Update DataSet MetaData method. But if I remember correctly, I had to delete all my rows first (things may have changed now since I haven't done this in a while). I was unhappy that I had to delete all my data rows, but at least I was able to continue streaming to the same dataset without creating a new one.

So I'm still trying to find an answer to this issues.  The closest thing I could find is this: Python Example

# Update a DataSets's metadata
    update = DataSetRequest()
    update.name = 'Leonhard Euler Party - Update'
    update.description = 'Mathematician Guest List - Update'
    update.schema = Schema([Column(ColumnType.STRING, 'Friend'),
                            Column(ColumnType.STRING, 'Attending')])
    updated_dataset = datasets.update(dataset['id'], update)
    domo.logger.info("Updated DataSet {}: {}".format(updated_dataset['id'],
                                                     updated_dataset['name']))

It seems that you can add an update.schema value to this and it will be picked up by the API and add those fields to your Schema.  I'm currently working with support to verify this and determine how to properly construct the fields, but this gives the best hints I've found so far.