class_docstr: Platform-independent GUID type.
  
  Uses PostgreSQL's UUID type, otherwise uses
  CHAR(32), storing as stringified hex values.
code: def load_dialect_impl(self, dialect: Dialect) -> TypeEngine[Any]:
      if dialect.name == "postgresql":
          return dialect.type_descriptor(UUID())
      else:
          return dialect.type_descriptor(CHAR(32))
  
file_path: sqlmodel/sqlmodel/sql/sqltypes.py
imports: import uuid
  from typing import Any, Optional, cast
  from sqlalchemy import CHAR, types
  from sqlalchemy.dialects.postgresql import UUID
  from sqlalchemy.engine.interfaces import Dialect
  from sqlalchemy.sql.type_api import TypeEngine
label_desc: Use image node_id 1 for calling the GUID obj's underlying member method code with example usage: obj.load_dialect_impl(dialect) and returns: dialect, dialect