code: static private ComparisonExpression rangeFilterFromPrefixLike(AbstractExpression leftExpr, ExpressionType rangeComparator, String comparand) {
          ConstantValueExpression cve = new ConstantValueExpression();
          cve.setValueType(VoltType.STRING);
          cve.setValue(comparand);
          cve.setValueSize(comparand.length());
          ComparisonExpression rangeFilter = new ComparisonExpression(rangeComparator, leftExpr, cve);
          return rangeFilter;
      }
docs: Construct the upper or lower bound expression that is implied by a prefix LIKE operator, given its required elements.
  @param leftExpr - the LIKE operator's (and the result's) lhs expression
  @param rangeComparator - a GTE or LT operator to indicate lower or upper bound, respectively,
  @param comparand - a string operand value derived from the LIKE operator's rhs pattern
  A helper for getGteFilterFromPrefixLike/getLtFilterFromPrefixLike