Firestore: impose required semantics for snapshots as cursors. #6837
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- Snapshot cursors imply on ordering on '__name__', if not already
present. Implied ordering is added at the end of the list, matching
the direction of the prior entry ('ASCENDING' if none exist).
- Snapshots copy their document reference into the '__name__' field
of their document values.
- Disallow use of snapshots from foreign collections as query cursors.
- In a query with one or more 'where' clauses using ordering operators,
and including a snapshot cursor, we must add ordering on the field(s)
used (IFF the field is not already in the query's 'order_by').
Closes #6665.
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Snapshot cursors imply on ordering on
__name__, if not already present. Implied ordering is added at the end of the list, matching the direction of the prior entry (ASCENDINGif none exist).Snapshots copy their document reference into the
__name__field of their document values.Disallow use of snapshots from foreign collections as query cursors.
In a query with one or more
whereclauses using ordering operators, and including a snapshot cursor, we must add ordering on the field(s) used (IFF the field is not already in the query'sorder_by).Closes #6665.