BigQuery now supports [DROP COLUMN][1]
ALTER TABLE [[project_name.]dataset_name.]table_name
DROP COLUMN [IF EXISTS] column_name [, ...]
[1]: https://cloud.google.com/bigquery/docs/reference/standard-sql/data-definition-language#alter_table_drop_column_statement
BigQuery now supports [DROP COLUMN][1]
ALTER TABLE [[project_name.]dataset_name.]table_name
DROP COLUMN [IF EXISTS] column_name [, ...]
[1]: https://cloud.google.com/bigquery/docs/reference/standard-sql/data-definition-language#alter_table_drop_column_statement