code: def downgrade():
      with op.batch_alter_table("sql_metrics", schema=None) as batch_op:
          batch_op.drop_column("is_restricted")
  
      with op.batch_alter_table("metrics", schema=None) as batch_op:
          batch_op.drop_column("is_restricted")
  
file_path: superset/superset/migrations/versions/2016-06-07_12-33_d8bc074f7aad_add_new_field_is_restricted_to_.py
imports: import sqlalchemy
  from alembic import op
  from sqlalchemy import Boolean, Column, Integer
  from sqlalchemy.ext.declarative import declarative_base
  from superset import db
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types