title: Firestore query for same value in multiple fields
body: <p>Is it possible to query data in cloud firestore for same value in either of multiple fields of a document.</p>
  <p><code>Example like this</code></p>
  <pre><code>await firestore()
        .collection('chats')
        .where('ownerUserId', '==', user.uid)
        .where('chatUserId', '==', user.uid)
        .orderBy('createdAt', 'desc')
        .get()
  </code></pre>
  <p><code>or to be more precise, something like this</code></p>
  <pre><code>await firestore()
        .collection('chats')
        .where('ownerUserId', '==', user.uid || 'chatUserId', '==', user.uid)
        // .where('chatUserId', '==', user.uid)
        .orderBy('createdAt', 'desc')
        .get()
  </code></pre>