presto-parser/src/main/java/io/prestosql/sql/ExpressionFormatter.java/ExpressionFormatter/visitExpression
class ExpressionFormatter:        @Override
        protected String visitExpression(Expression node, Void context)
        {
            throw new UnsupportedOperationException(format("not yet implemented: %s.visit%s", getClass().getName(), node.getClass().getSimpleName()));
        }