presto-main/src/main/java/io/prestosql/sql/planner/SortExpressionContext.java/SortExpressionContext/toString
class SortExpressionContext:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("sortExpression", sortExpression)
                .add("searchExpressions", searchExpressions)
                .toString();
    }