fix: Remove DocumentReference from cursor #1882
Merged
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Cursors accepts DocumentSnapshot or field values. https://googleapis.dev/nodejs/firestore/latest/CollectionReference.html#startAt
When field values are passed in to a cursor, it must followed by orderBy clauses of a 1:1 mapping relationship. But, if DocumentSnapshot is used, orderBy clauses are implicitly added by SDK on behalf of the client.
This PR fixes the problem that DocumentReference is given the same special treatment that DocumentSnapshot is receiving, but it does not provide field values like DocumentSnapshot does, which leads to query failure/ incorrect result.