mariadb-10.2.9/storage/mroonga/vendor/groonga/lib/proc.c:4515:8: warning: this statement may fall through

  switch (type) {

  case GRN_DB_UINT8 :

    if (is_negative_value(src)) {

      GRN_UINT8_SET(ctx, dest, 0);

      return GRN_TRUE;

    }

  case GRN_DB_UINT16 :

    if (is_negative_value(src)) {

      GRN_UINT16_SET(ctx, dest, 0);

      return GRN_TRUE;

    }