Method substr

cpp/src/arrow/util/trie_internal.h:82–84

  }

  SmallString substr(size_t pos) const {
    return SmallString(std::string_view(*this).substr(pos));
  }

  SmallString substr(size_t pos, size_t count) const {
    return SmallString(std::string_view(*this).substr(pos, count));