moiseenkov opened a new pull request, #39233:
URL: https://github.com/apache/airflow/pull/39233

   Fixed batching for the following operators:
   - BigQueryToPostgresOperator
   - BigQueryToMsSqlOperator
   - BigQueryToMySqlOperator
   
   Previously, if users specify the `batch_size` parameter it is used only for 
reading from the BigQuery, however, the writing to the database is performed 
with the default batch size of 1000 rows. This PR fixes that and the specified 
`batch_size` now used for both reading from BigQuery and writing to a database.
   
   Additionally, updated the system test.


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