presto-parser/src/main/java/io/prestosql/sql/ExpressionFormatter.java/ExpressionFormatter/visitSubscriptExpression
class ExpressionFormatter:        @Override
        protected String visitSubscriptExpression(SubscriptExpression node, Void context)
        {
            return formatSql(node.getBase()) + "[" + formatSql(node.getIndex()) + "]";
        }