code: def upgrade():
      op.add_column(
          "columns", sa.Column("avg", sa.Boolean(), nullable=True)
      )
      op.add_column(
          "table_columns", sa.Column("avg", sa.Boolean(), nullable=True)
      )
  
imports: import sqlalchemy
  from alembic import op
label_desc: Use image node_id 1 for calling a global function with example usage: upgrade() without return types