Is there a difference in `BigQueryIO` when you use `fromTable` vs `fromQuery(“SELECT * …”)` in dataflow?

Question

When you need to read all the data from one or more tables in bigquery in a dataflow job there are two approaches to it I would say. The first one is to use BigQueryIO

Answer 1

from is both cheaper and faster than fromQuery(SELECT * FROM ...).

• from directly exports the table and exporting data is free for BigQuery.
• fromQuery(SELECT * FROM ...) will first scan the entire table ($5/TB) and export the result.