pub fn read_query(kind: ProjectionKind) -> Option<(&'static str, &'static str)>Expand description
The paged read for one projection and the column it pages by, or None if
the kind has no table — which cannot happen while
[every_projection_is_visited_exactly_once_in_a_written_down_order] passes,
and is returned rather than panicked because this is reached from a client
request.
The two travel together on purpose: a caller that had the query but chose the cursor field for itself would be free to choose a different one.