code: @NonNull
      public Expression greaterThanOrEqualTo(@NonNull Expression expression) {
          if (expression == null) {
              throw new IllegalArgumentException("expression cannot be null.");
          }
          return new BinaryExpression(this, expression, BinaryExpression.OpType.GreaterThanOrEqualTo);
      }
docs: Create a greater than or equal to expression that evaluates whether or not the current
  expression is greater than or equal to the given expression.
  
  @param expression the expression to compare with the current expression.
  @return a greater than or equal to expression.