presto-parser/src/main/java/io/prestosql/sql/SqlFormatter.java/Formatter/visitShowFunctions
class Formatter:        @Override
        protected Void visitShowFunctions(ShowFunctions node, Integer context)
        {
            builder.append("SHOW FUNCTIONS");

            node.getLikePattern().ifPresent((value) ->
                    builder.append(" LIKE ")
                            .append(formatStringLiteral(value)));

            node.getEscape().ifPresent((value) ->
                    builder.append(" ESCAPE ")
                            .append(formatStringLiteral(value)));

            return null;
        }