How to query two nullable nested fields are not equal? [newbie question]

[roliu]

Hi, 

I have a dataset like below

[
  {classificationA: null, classificationB: null},
  {classificationA: {name: 'Education'}, classificationB: {name: 'Education'}},
  {classificationA: {name: 'IT'}, classificationB: {name: 'IT'}}
} 

My aim is to find all the rows whose classificationA is not equals to classificationB. So given the above dataset, it should return zero rows.

I thought it should be:

 | where classficationA != classficationB

But it is not working.  Anyone can help? Thank you!

[bowesmana]

Is that your 'raw' data - it is not valid JSON. Is that a single event or 3 events?

Please share the raw data - if it's 3 classifications inside a single event, then please paste an example of the true _raw element of the value of a field that's extracted