Query for Null or Missing Fields

[ericfong]

Thanks for your package first. That is really amazing.

I found that the behavior of find({ someField: null }) is not same as mongodb

https://docs.mongodb.com/manual/tutorial/query-for-null-fields/

in which null should also match with undefined field.
Shall mingo align that with mongoDb spec? Or that is expected behavior?

BTW. I have done a little benchmark and found that is much faster than sift and within same level as nedb and lokijs. Thanks a lot.

[kofrasa]

Hi @ericfong ,

Thanks for reporting this, it is definitely a bug. I am doing some work to move into the new age of es6 ;) so I should be able to throw in a fix fairly quickly, however a pull request is also welcome.

I appreciate the tiny benchmark done. I am happy to know Mingo is not lagging behind in performance given I have mostly prioritized features and MongoDB compatibility. :)

[ericfong]

Thanks a lot.