Get TableSchema from BigQuery result PCollection

Question

When I run a query in BigQuery Web UI, the results are displayed in a table where both name and type of each field are known (even when a field is a result of COUNT(), AVG()

Answer 1

Conceptually - you should write the function which will iterate thru all cells of given TableRow and for each - get name and type and while iterating you will create respective TableSchema.
For simple schemas, I would expect, it should be relatively easy.
For schemas with records, repeated, etc. this could be more complex