Improve sorting for GQL::getDatasetListFlows query

src/infra/flow-system/inmem/src/flow/inmem_flow_event_store.rs

@@ -482,25 +482,7 @@ impl FlowEventStore for InMemoryFlowEventStore {
         filters: &DatasetFlowFilters,
         pagination: PaginationOpts,
     ) -> FlowIDStream {
-        let flow_ids_page: Vec<_> = {
-            let state = self.inner.as_state();
-            let g = state.lock().unwrap();
-            g.all_flows_by_dataset
-                .get(dataset_id)
-                .map(|dataset_flow_ids| {
-                    dataset_flow_ids
-                        .iter()
-                        .rev()
-                        .filter(|flow_id| g.matches_dataset_flow(**flow_id, filters))
-                        .skip(pagination.offset)
-                        .take(pagination.limit)
-                        .map(|flow_id| Ok(*flow_id))
-                        .collect()
-                })
-                .unwrap_or_default()
-        };
-
-        Box::pin(futures::stream::iter(flow_ids_page))
+        self.get_all_flow_ids_by_datasets(HashSet::from([dataset_id.clone()]), filters, pagination)
     }
 
     #[tracing::instrument(level = "debug", skip_all, fields(%dataset_id))]

src/infra/flow-system/postgres/src/postgres_flow_event_store.rs

@@ -592,12 +592,21 @@ impl FlowEventStore for PostgresFlowEventStore {
 
             let mut query_stream = sqlx::query!(
                 r#"
-                SELECT flow_id FROM flows
-                    WHERE dataset_id = $1
-                    AND (cast($2 as dataset_flow_type) IS NULL OR dataset_flow_type = $2)
-                    AND (cast($3 as flow_status_type) IS NULL OR flow_status = $3)
-                    AND (cast($4 as TEXT[]) IS NULL OR initiator = ANY($4))
-                ORDER BY flow_id DESC
+                WITH unsorted_flows AS
+                    (SELECT
+                        f.flow_id,
+                        f.flow_status,
+                        MAX(e.event_time) as last_event_time
+                    FROM flows f
+                    LEFT JOIN flow_events e USING(flow_id)
+                    WHERE
+                        f.dataset_id = $1
+                        AND (cast($2 as dataset_flow_type) IS NULL OR f.dataset_flow_type = $2)
+                        AND (cast($3 as flow_status_type) IS NULL OR f.flow_status = $3)
+                        AND (cast($4 as TEXT[]) IS NULL OR f.initiator = ANY($4))
+                    GROUP BY f.flow_id, f.flow_status)
+                SELECT flow_id FROM unsorted_flows
+                ORDER BY flow_status, last_event_time DESC
                 LIMIT $5 OFFSET $6
                 "#,
                dataset_id,

src/infra/flow-system/sqlite/src/sqlite_flow_event_store.rs

@@ -646,12 +646,25 @@ impl FlowEventStore for SqliteFlowEventStore {
 
             let query_str = format!(
                 r#"
-                SELECT flow_id FROM flows
+                WITH unsorted_flows AS
+                    (SELECT
+                        f.flow_id,
+                        f.flow_status,
+                        MAX(e.event_time) as last_event_time,
+                        (CASE
+                            WHEN f.flow_status = 'waiting' THEN 1
+                            WHEN f.flow_status = 'running' THEN 2
+                            ELSE 3
+                        END) AS ord_status
+                    FROM flows f
+                    LEFT JOIN flow_events e USING(flow_id)
                     WHERE dataset_id = $1
                     AND (cast($2 as dataset_flow_type) IS NULL OR dataset_flow_type = $2)
                     AND (cast($3 as flow_status_type) IS NULL OR flow_status = $3)
-                    AND ($4 = 0 OR initiator IN ({}))
-                ORDER BY flow_id DESC
+                    AND ($4 = 0 OR initiator in ({}))
+                    GROUP BY f.flow_id, f.flow_status)
+                SELECT flow_id FROM unsorted_flows
+                ORDER BY ord_status, last_event_time DESC
                 LIMIT $5 OFFSET $6
                 "#,
                 maybe_initiators