docs: @NonNull
    public static CqlIdentifier fromCql(@NonNull String cql) {
      Preconditions.checkNotNull(cql, "cql must not be null");
      final String internal;
      if (Strings.isDoubleQuoted(cql)) {
        internal = Strings.unDoubleQuote(cql);
      } else {
        internal = cql.toLowerCase();
        Preconditions.checkArgument(
            !Strings.needsDoubleQuotes(internal), "Invalid CQL form [%s]: needs double quotes", cql);
      }
      return fromInternal(internal);
    }