code: def upgrade():
      op.alter_column(
          "report_schedule",
          "extra",
          new_column_name="extra_json",
          # existing info is required for MySQL
          existing_type=Text,
          existing_nullable=True,
      )
  
imports: from alembic import op
  from sqlalchemy.types import Text
label_desc: Use image node_id 1 for calling a global function with example usage: upgrade() without return types