private static RelationType @NotNull [] splitRelation(RelationType relationType) {
    return switch (relationType) {
      case LT, LE, GT, GE -> new RelationType[]{RelationType.LT, RelationType.GT, RelationType.EQ};
      default -> new RelationType[]{relationType, relationType.getNegated()};
    };
  }
private static RelationType @NotNull [] splitRelation(RelationType relationType)