message: fixing deserialization
diff: @@ -132,7 +132,7 @@ unique_ptr<ParsedExpression> FunctionExpression::Deserialize(ExpressionType type
  auto order_bys = unique_ptr_cast<ResultModifier, OrderModifier>(reader.ReadRequiredSerializable<ResultModifier>());
  auto distinct = reader.ReadRequired<bool>();
  auto is_operator = reader.ReadRequired<bool>();
  - auto export_state = reader.ReadRequired<bool>();
  + auto export_state = reader.ReadField<bool>(false);
  unique_ptr<FunctionExpression> function;
  function = make_unique<FunctionExpression>(function_name, move(children), move(filter), move(order_bys), distinct,
  