Should BigQueryUpdateTableSchemaOperator support Removal of Column.

[KamranImaaz]

while the present method BigQueryUpdateTableSchemaOperator(airflow/provider/google/cloud/operator/BigQuery.py) contains the logic for the addition or updation of the schema of a table. It does not mention the removal of columns.

In Some cases Users may want to delete a particular column. I understand that removing a column implies removing a huge amount of information.

I wanted to understand about

1. Whether Airflow allows implementing the removal of columns.
2. If so, what would be the safest API shape(like having an explicit field removal_fields)
3. If they delete accidentally they should be allowed to revert/recover the changes??

Appreciate your feedback before implementation.