I'm trying to build a query like this:

```
"i_field": {
    "$or": [{
            query_1
        }, {
            query_2
        }
    ]
}

```

However mongo throws exception `"Can't canonicalize query: BadValue unknown operator: $or"` since I must use `$or` in top level (or that's my understanding so far).

Working OR in top level query: **(but that's not what I need)**

```
"$or": [{
        "i_field": query_1
    }, {
        "i_field": query_2
    }
]

```

Does anyone have any suggestions how could I make this query work?

**Edit** (real exmple):

```
"i_field": {
    "$or": [{
            "$gte": 3.5,
            "$lt": 88.5
        }, {
            "$eq": null
        }
    ]
}

```