parameters: (self, mask1, mask2)
docstring: Merges mask1 and mask2 into this FieldMask.
docstring_summary: Merges mask1 and mask2 into this FieldMask.
docstring_tokens: Merges mask1 and mask2 into this FieldMask .
function: def Union(self, mask1, mask2):
      """Merges mask1 and mask2 into this FieldMask."""
      _CheckFieldMaskMessage(mask1)
      _CheckFieldMaskMessage(mask2)
      tree = _FieldMaskTree(mask1)
      tree.MergeFromFieldMask(mask2)
      tree.ToFieldMask(self)
function_tokens: def Union ( self , mask1 , mask2 ) : _CheckFieldMaskMessage ( mask1 ) _CheckFieldMaskMessage ( mask2 ) tree = _FieldMaskTree ( mask1 ) tree . MergeFromFieldMask ( mask2 ) tree . ToFieldMask ( self )