code: def uuid() -> Expression[str]:
      """
      Returns an UUID (Universally Unique Identifier) string (e.g.,
      "3d3c68f7-f608-473f-b60c-b0c44ad4cc4e") according to RFC 4122 type 4 (pseudo randomly
      generated) UUID. The UUID is generated using a cryptographically strong pseudo random number
      generator.
      """
      return _leaf_op("uuid")
  
imports: from typing import Union
  from pyflink import add_version_doc
  from pyflink.java_gateway import get_gateway
  from pyflink.table.expression import Expression, _get_java_expression, TimePointUnit, JsonOnNull
  from pyflink.table.types import _to_java_data_type, DataType
  from pyflink.table.udf import UserDefinedFunctionWrapper
  from pyflink.util.java_utils import to_jarray, load_java_class
label_desc: Use image node_id 43 for calling a global function with example usage: uuid() and returns: _leaf_op