code: def row_env(self, default_value=None):
      if default_value is None:
          return {"global": self.global_type, "va": self.row_type}
      else:
          return {"global": default_value, "va": default_value}
  
imports: import pprint
  from hail.typecheck import typecheck_method, sequenceof
  from hail.utils.java import escape_parsable
  from hail.expr.types import dtype, tstruct
  from hail.utils.java import jiterable_to_list
label_desc: Use image node_id 18 for calling the tmatrix obj's underlying member method code with example usage: obj.row_env(default_value) and returns: dict, dict