{
  "tests": [
    {
      "description": "query: a Where clause comparing to null",
      "comment": "A Where clause that tests for equality with null results in a unary filter.",
      "query": {
        "collPath": "projects/projectID/databases/(default)/documents/C",
        "clauses": [
          {
            "where": {
              "path": {
                "field": [
                  "a"
                ]
              },
              "op": "==",
              "jsonValue": "null"
            }
          }
        ],
        "query": {
          "from": [
            {
              "collectionId": "C"
            }
          ],
          "where": {
            "unaryFilter": {
              "op": "IS_NULL",
              "field": {
                "fieldPath": "a"
              }
            }
          }
        }
      }
    }
  ]
}