presto-parser/src/main/java/io/prestosql/sql/tree/NullIfExpression.java/NullIfExpression/equals
class NullIfExpression:    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        NullIfExpression that = (NullIfExpression) o;
        return Objects.equals(first, that.first) &&
                Objects.equals(second, that.second);
    }