presto-parser/src/main/java/io/prestosql/sql/SqlFormatter.java/Formatter/visitSetSession
class Formatter:        @Override
        public Void visitSetSession(SetSession node, Integer context)
        {
            builder.append("SET SESSION ")
                    .append(node.getName())
                    .append(" = ")
                    .append(formatExpression(node.getValue()));

            return null;
        }