Method of

core/src/main/java/org/apache/calcite/util/Sarg.java:123–128

(boolean containsNull,
      RangeSet<C> rangeSet)

  }

  @Deprecated // to be removed before 2.0
  public static <C extends Comparable<C>> Sarg<C> of(boolean containsNull,
      RangeSet<C> rangeSet) {
    return of(containsNull ? RexUnknownAs.TRUE : RexUnknownAs.UNKNOWN,
        rangeSet);
  }

  /** Creates a search argument. */
  public static <C extends Comparable<C>> Sarg<C> of(RexUnknownAs nullAs,