<t>All you need to do is change your query to<br/>
<br/>
SELECT r.id, r.authToken.instagram,r.userName FROM root r WHERE r.abc != null<br/>
<br/>
```<br/>
<br/>
or<br/>
<br/>
```<br/>
SELECT r.id, r.authToken.instagram,r.userName FROM root r WHERE r.abc null<br/>
<br/>
```<br/>
<br/>
Both operators work (tested on the Data Explorer)</t>