presto-parser/src/main/java/io/prestosql/sql/ExpressionFormatter.java/ExpressionFormatter/visitIdentifier
class ExpressionFormatter:        @Override
        protected String visitIdentifier(Identifier node, Void context)
        {
            if (!node.isDelimited()) {
                return node.getValue();
            }
            else {
                return '"' + node.getValue().replace("\"", "\"\"") + '"';
            }
        }