Struct DeltaQuery 

#[non_exhaustive]
pub struct DeltaQuery<T: DeltaSyncCacheable> {
    pub since: Option<T::Watermark>,
    pub recover_ids: HashSet<T::Id>,
}

Query passed to DeltaPunnuFetcher::fetch_delta.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

since: Option<T::Watermark>

The current subscription watermark. None means a full query.

When this is Some, fetchers must query with an inclusive >= boundary and let Sassi deduplicate rows by identity.

recover_ids: HashSet<T::Id>

IDs that must be recovered regardless of watermark.

Eviction recovery uses this to ask the fetcher for IDs that this subscription previously observed but L1 later evicted.