presto-main/src/main/java/io/prestosql/sql/analyzer/AggregationAnalyzer.java/Visitor/visitSubscriptExpression
class Visitor:        @Override
        protected Boolean visitSubscriptExpression(SubscriptExpression node, Void context)
        {
            return process(node.getBase(), context) &&
                    process(node.getIndex(), context);
        }