Method read

bolt/expression/tests/MapViewTest.cpp:78–86

  }

  ViewType read(
      exec::VectorReader<Map<int64_t, int64_t>>& reader,
      size_t offset) {
    if constexpr (returnsOptionalValues) {
      return reader[offset];
    } else {
      return reader.readNullFree(offset);
    }
  }

  bool mapValueHasValue(typename ViewType::ValueAccessor value) {
    if constexpr (returnsOptionalValues) {