presto-main/src/main/java/io/prestosql/sql/analyzer/AggregationAnalyzer.java/AggregationAnalyzer/visitNullIfExpression
class AggregationAnalyzer:        @Override
        protected Boolean visitNullIfExpression(NullIfExpression node, Void context)
        {
            return process(node.getFirst(), context) && process(node.getSecond(), context);
        }