apply review changes

Co-authored-by: Clément Renault <clement@meilisearch.com>

.github/workflows/flaky-tests.yml

@@ -21,10 +21,10 @@ jobs:
     - name: Install cargo-flaky
       run: cargo install cargo-flaky
     - name: Run cargo flaky in the dumps
-      run: cd dump; cargo flaky -i 100 --release
+      run: cd crates/dump; cargo flaky -i 100 --release
     - name: Run cargo flaky in the index-scheduler
-      run: cd index-scheduler; cargo flaky -i 100 --release
+      run: cd crates/index-scheduler; cargo flaky -i 100 --release
     - name: Run cargo flaky in the auth
-      run: cd meilisearch-auth; cargo flaky -i 100 --release
+      run: cd crates/meilisearch-auth; cargo flaky -i 100 --release
     - name: Run cargo flaky in meilisearch
-      run: cd meilisearch; cargo flaky -i 100 --release
+      run: cd crates/meilisearch; cargo flaky -i 100 --release

crates/dump/src/reader/compat/v5_to_v6.rs

@@ -450,7 +450,7 @@ pub(crate) mod test {
         // tasks
         let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
         let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
-        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"41f91d3a94911b2735ec41b07540df5c");
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"4b03e23e740b27bfb9d2a1faffe512e2");
         assert_eq!(update_files.len(), 22);
         assert!(update_files[0].is_none()); // the dump creation
         assert!(update_files[1].is_some()); // the enqueued document addition

crates/dump/src/reader/mod.rs

@@ -222,7 +222,7 @@ pub(crate) mod test {
         // tasks
         let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
         let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
-        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"278f63325ef06ca04d01df98d8207b94");
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"2b8a72d6bc6ba79980491966437daaf9");
         assert_eq!(update_files.len(), 10);
         assert!(update_files[0].is_none()); // the dump creation
         assert!(update_files[1].is_none());
@@ -345,7 +345,7 @@ pub(crate) mod test {
         // tasks
         let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
         let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
-        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"d45cd8571703e58ae53c7bd7ce3f5c22");
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"3ddf6169b0a3703c5d770971f036fc5d");
         assert_eq!(update_files.len(), 2);
         assert!(update_files[0].is_none()); // the dump creation
         assert!(update_files[1].is_none()); // the processed document addition
@@ -391,7 +391,7 @@ pub(crate) mod test {
         // tasks
         let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
         let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
-        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"41f91d3a94911b2735ec41b07540df5c");
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"4b03e23e740b27bfb9d2a1faffe512e2");
         assert_eq!(update_files.len(), 22);
         assert!(update_files[0].is_none()); // the dump creation
         assert!(update_files[1].is_some()); // the enqueued document addition
@@ -471,7 +471,7 @@ pub(crate) mod test {
         // tasks
         let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
         let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
-        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"c2445ddd1785528b80f2ba534d3bd00c");
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"c1b06a5ca60d5805483c16c5b3ff61ef");
         assert_eq!(update_files.len(), 10);
         assert!(update_files[0].is_some()); // the enqueued document addition
         assert!(update_files[1..].iter().all(|u| u.is_none())); // everything already processed
@@ -548,7 +548,7 @@ pub(crate) mod test {
         // tasks
         let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
         let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
-        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"cd12efd308fe3ed226356a727ab42ed3");
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"0e203b6095f7c68dbdf788321dcc8215");
         assert_eq!(update_files.len(), 10);
         assert!(update_files[0].is_some()); // the enqueued document addition
         assert!(update_files[1..].iter().all(|u| u.is_none())); // everything already processed
@@ -641,7 +641,7 @@ pub(crate) mod test {
         // tasks
         let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
         let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
-        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"bc616290adfe7d09a624cf6065ca9069");
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"d216c7f90f538ffbb2a059531d7ac89a");
         assert_eq!(update_files.len(), 9);
         assert!(update_files[0].is_some()); // the enqueued document addition
         assert!(update_files[1..].iter().all(|u| u.is_none())); // everything already processed
@@ -734,7 +734,7 @@ pub(crate) mod test {
         // tasks
         let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
         let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
-        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"2db37756d8af1fb7623436b76e8956a6");
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"e27999f1112632222cb84f6cffff7c5f");
         assert_eq!(update_files.len(), 8);
         assert!(update_files[0..].iter().all(|u| u.is_none())); // everything already processed
 
@@ -810,7 +810,7 @@ pub(crate) mod test {
         // tasks
         let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
         let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
-        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"8df6eab075a44b3c1af6b726f9fd9a43");
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"0155a664b0cf62aae23db5138b6b03d7");
         assert_eq!(update_files.len(), 9);
         assert!(update_files[..].iter().all(|u| u.is_none())); // no update file in dump v1
 

crates/index-scheduler/src/batch.rs

@@ -46,7 +46,7 @@ use uuid::Uuid;
 
 use crate::autobatcher::{self, BatchKind};
 use crate::utils::{self, swap_index_uid_in_task, ProcessingBatch};
-use crate::{Error, IndexScheduler, MustStopProcessing, ProcessingTasks, Result, TaskId};
+use crate::{Error, IndexScheduler, MustStopProcessing, Result, TaskId};
 
 /// Represents a combination of tasks that can all be processed at the same time.
 ///
@@ -58,10 +58,6 @@ pub(crate) enum Batch {
     TaskCancelation {
         /// The task cancelation itself.
         task: Task,
-        /// The date and time at which the previously processing tasks started.
-        previous_started_at: OffsetDateTime,
-        /// The list of tasks that were processing when this task cancelation appeared.
-        previous_processing_tasks: RoaringBitmap,
     },
     TaskDeletions(Vec<Task>),
     SnapshotCreation(Vec<Task>),
@@ -286,7 +282,7 @@ impl IndexScheduler {
         match batch {
             BatchKind::DocumentClear { ids } => Ok(Some(Batch::IndexOperation {
                 op: IndexOperation::DocumentClear {
-                    tasks: self.get_existing_tasks_with_processing_batch(
+                    tasks: self.get_existing_tasks_for_processing_batch(
                         rtxn,
                         current_batch,
                         ids,
@@ -312,7 +308,7 @@ impl IndexScheduler {
                 }
             }
             BatchKind::DocumentOperation { method, operation_ids, .. } => {
-                let tasks = self.get_existing_tasks_with_processing_batch(
+                let tasks = self.get_existing_tasks_for_processing_batch(
                     rtxn,
                     current_batch,
                     operation_ids,
@@ -363,7 +359,7 @@ impl IndexScheduler {
                 }))
             }
             BatchKind::DocumentDeletion { deletion_ids, includes_by_filter: _ } => {
-                let tasks = self.get_existing_tasks_with_processing_batch(
+                let tasks = self.get_existing_tasks_for_processing_batch(
                     rtxn,
                     current_batch,
                     deletion_ids,
@@ -375,7 +371,7 @@ impl IndexScheduler {
                 }))
             }
             BatchKind::Settings { settings_ids, .. } => {
-                let tasks = self.get_existing_tasks_with_processing_batch(
+                let tasks = self.get_existing_tasks_for_processing_batch(
                     rtxn,
                     current_batch,
                     settings_ids,
@@ -524,7 +520,7 @@ impl IndexScheduler {
             BatchKind::IndexDeletion { ids } => Ok(Some(Batch::IndexDeletion {
                 index_uid,
                 index_has_been_created: must_create_index,
-                tasks: self.get_existing_tasks_with_processing_batch(rtxn, current_batch, ids)?,
+                tasks: self.get_existing_tasks_for_processing_batch(rtxn, current_batch, ids)?,
             })),
             BatchKind::IndexSwap { id } => {
                 let mut task = self.get_task(rtxn, id)?.ok_or(Error::CorruptedTaskQueue)?;
@@ -556,25 +552,9 @@ impl IndexScheduler {
 
         // 1. we get the last task to cancel.
         if let Some(task_id) = to_cancel.max() {
-            // We retrieve the tasks that were processing before this tasks cancelation started.
-            // We must *not* reset the processing tasks before calling this method.
-            // Displaying the `batch_id` would make a strange error message since this task cancelation is going to
-            // replace the canceled batch. It's better to avoid mentioning it in the error message.
-            let ProcessingTasks { batch: previous_batch, processing } =
-                &*self.processing_tasks.read().unwrap();
             let mut task = self.get_task(rtxn, task_id)?.ok_or(Error::CorruptedTaskQueue)?;
             current_batch.processing(Some(&mut task));
-            return Ok(Some((
-                Batch::TaskCancelation {
-                    task,
-                    // We should never be in a case where we don't have a previous_batch, but let's not crash if it happens
-                    previous_started_at: previous_batch
-                        .as_ref()
-                        .map_or_else(OffsetDateTime::now_utc, |batch| batch.started_at),
-                    previous_processing_tasks: processing.clone(),
-                },
-                current_batch,
-            )));
+            return Ok(Some((Batch::TaskCancelation { task }, current_batch)));
         }
 
         // 2. we get the next task to delete
@@ -681,7 +661,7 @@ impl IndexScheduler {
         }
 
         match batch {
-            Batch::TaskCancelation { mut task, previous_started_at, previous_processing_tasks } => {
+            Batch::TaskCancelation { mut task } => {
                 // 1. Retrieve the tasks that matched the query at enqueue-time.
                 let matched_tasks =
                     if let KindWithContent::TaskCancelation { tasks, query: _ } = &task.kind {

crates/index-scheduler/src/lib.rs

@@ -67,7 +67,7 @@ use roaring::RoaringBitmap;
 use synchronoise::SignalEvent;
 use time::format_description::well_known::Rfc3339;
 use time::OffsetDateTime;
-use utils::{filter_out_references_to_newer_tasks, keep_tasks_within_datetimes, map_bound};
+use utils::{filter_out_references_to_newer_tasks, keep_ids_within_datetimes, map_bound};
 use uuid::Uuid;
 
 use crate::index_mapper::IndexMapper;
@@ -85,6 +85,8 @@ pub struct Query {
     pub limit: Option<u32>,
     /// The minimum [task id](`meilisearch_types::tasks::Task::uid`) to be matched
     pub from: Option<u32>,
+    /// The order used to return the tasks. By default the newest tasks are returned first and the boolean is `false`.
+    pub reverse: Option<bool>,
     /// The [task ids](`meilisearch_types::tasks::Task::uid`) to be matched
     pub uids: Option<Vec<TaskId>>,
     /// The [batch ids](`meilisearch_types::batches::Batch::uid`) to be matched
@@ -129,6 +131,7 @@ impl Query {
             Query {
                 limit: None,
                 from: None,
+                reverse: None,
                 uids: None,
                 batch_uids: None,
                 statuses: None,
@@ -770,6 +773,7 @@ impl IndexScheduler {
         let Query {
             limit,
             from,
+            reverse,
             uids,
             batch_uids,
             statuses,
@@ -787,13 +791,18 @@ impl IndexScheduler {
         let mut tasks = self.all_task_ids(rtxn)?;
 
         if let Some(from) = from {
-            tasks.remove_range(from.saturating_add(1)..);
+            let range = if reverse.unwrap_or_default() {
+                u32::MIN..*from
+            } else {
+                from.saturating_add(1)..u32::MAX
+            };
+            tasks.remove_range(range);
         }
 
         if let Some(batch_uids) = batch_uids {
             let mut batch_tasks = RoaringBitmap::new();
             for batch_uid in batch_uids {
-                if Some(*batch_uid) == processing_batch.as_ref().map(|batch| batch.uid) {
+                if processing_batch.as_ref().map_or(false, |batch| batch.uid == *batch_uid) {
                     batch_tasks |= &processing_tasks;
                 } else {
                     batch_tasks |= self.tasks_in_batch(rtxn, *batch_uid)?;
@@ -895,7 +904,7 @@ impl IndexScheduler {
                 ),
             };
 
-            keep_tasks_within_datetimes(
+            keep_ids_within_datetimes(
                 rtxn,
                 &mut filtered_non_processing_tasks,
                 self.started_at,
@@ -905,7 +914,7 @@ impl IndexScheduler {
             filtered_non_processing_tasks | filtered_processing_tasks
         };
 
-        keep_tasks_within_datetimes(
+        keep_ids_within_datetimes(
             rtxn,
             &mut tasks,
             self.enqueued_at,
@@ -913,7 +922,7 @@ impl IndexScheduler {
             *before_enqueued_at,
         )?;
 
-        keep_tasks_within_datetimes(
+        keep_ids_within_datetimes(
             rtxn,
             &mut tasks,
             self.finished_at,
@@ -921,8 +930,12 @@ impl IndexScheduler {
             *before_finished_at,
         )?;
 
-        if let Some(limit) = *limit {
-            tasks = tasks.into_iter().rev().take(limit as usize).collect();
+        if let Some(limit) = limit {
+            tasks = if query.reverse.unwrap_or_default() {
+                tasks.into_iter().take(*limit as usize).collect()
+            } else {
+                tasks.into_iter().rev().take(*limit as usize).collect()
+            };
         }
 
         Ok(tasks)
@@ -935,22 +948,44 @@ impl IndexScheduler {
         processing: &ProcessingTasks,
         query: &Query,
     ) -> Result<RoaringBitmap> {
-        dbg!();
+        let Query {
+            limit,
+            from,
+            reverse,
+            uids,
+            batch_uids,
+            statuses,
+            types,
+            index_uids,
+            canceled_by,
+            before_enqueued_at,
+            after_enqueued_at,
+            before_started_at,
+            after_started_at,
+            before_finished_at,
+            after_finished_at,
+        } = query;
+
         let mut batches = self.all_batch_ids(rtxn)?;
         if let Some(batch_id) = processing.batch.as_ref().map(|batch| batch.uid) {
             batches.insert(batch_id);
         }
 
-        if let Some(from) = &query.from {
-            batches.remove_range(from.saturating_add(1)..);
+        if let Some(from) = from {
+            let range = if reverse.unwrap_or_default() {
+                u32::MIN..*from
+            } else {
+                from.saturating_add(1)..u32::MAX
+            };
+            batches.remove_range(range);
         }
 
-        if let Some(batch_uids) = &query.batch_uids {
+        if let Some(batch_uids) = &batch_uids {
             let batches_uids = RoaringBitmap::from_iter(batch_uids);
             batches &= batches_uids;
         }
 
-        if let Some(status) = &query.statuses {
+        if let Some(status) = &statuses {
             let mut status_batches = RoaringBitmap::new();
             for status in status {
                 match status {
@@ -973,7 +1008,7 @@ impl IndexScheduler {
             batches &= status_batches;
         }
 
-        if let Some(task_uids) = &query.uids {
+        if let Some(task_uids) = &uids {
             let mut batches_by_task_uids = RoaringBitmap::new();
             for task_uid in task_uids {
                 if let Some(task) = self.get_task(rtxn, *task_uid)? {
@@ -986,7 +1021,7 @@ impl IndexScheduler {
         }
 
         // There is no database for this query, we must retrieve the task queried by the client and ensure it's valid
-        if let Some(canceled_by) = &query.canceled_by {
+        if let Some(canceled_by) = &canceled_by {
             let mut all_canceled_batches = RoaringBitmap::new();
             for cancel_uid in canceled_by {
                 if let Some(task) = self.get_task(rtxn, *cancel_uid)? {
@@ -1009,7 +1044,7 @@ impl IndexScheduler {
             }
         }
 
-        if let Some(kind) = &query.types {
+        if let Some(kind) = &types {
             let mut kind_batches = RoaringBitmap::new();
             for kind in kind {
                 kind_batches |= self.get_batch_kind(rtxn, *kind)?;
@@ -1024,7 +1059,7 @@ impl IndexScheduler {
             batches &= &kind_batches;
         }
 
-        if let Some(index) = &query.index_uids {
+        if let Some(index) = &index_uids {
             let mut index_batches = RoaringBitmap::new();
             for index in index {
                 index_batches |= self.index_batches(rtxn, index)?;
@@ -1065,48 +1100,52 @@ impl IndexScheduler {
                         filtered_processing_batches.clear();
                     }
                 };
-            match (query.after_started_at, query.before_started_at) {
+            match (after_started_at, before_started_at) {
                 (None, None) => (),
                 (None, Some(before)) => {
-                    clear_filtered_processing_batches(Bound::Unbounded, Bound::Excluded(before))
+                    clear_filtered_processing_batches(Bound::Unbounded, Bound::Excluded(*before))
                 }
                 (Some(after), None) => {
-                    clear_filtered_processing_batches(Bound::Excluded(after), Bound::Unbounded)
+                    clear_filtered_processing_batches(Bound::Excluded(*after), Bound::Unbounded)
                 }
                 (Some(after), Some(before)) => clear_filtered_processing_batches(
-                    Bound::Excluded(after),
-                    Bound::Excluded(before),
+                    Bound::Excluded(*after),
+                    Bound::Excluded(*before),
                 ),
             };
 
-            keep_tasks_within_datetimes(
+            keep_ids_within_datetimes(
                 rtxn,
                 &mut filtered_non_processing_batches,
                 self.batch_started_at,
-                query.after_started_at,
-                query.before_started_at,
+                *after_started_at,
+                *before_started_at,
             )?;
             filtered_non_processing_batches | filtered_processing_batches
         };
 
-        keep_tasks_within_datetimes(
+        keep_ids_within_datetimes(
             rtxn,
             &mut batches,
             self.batch_enqueued_at,
-            query.after_enqueued_at,
-            query.before_enqueued_at,
+            *after_enqueued_at,
+            *before_enqueued_at,
         )?;
 
-        keep_tasks_within_datetimes(
+        keep_ids_within_datetimes(
             rtxn,
             &mut batches,
             self.batch_finished_at,
-            query.after_finished_at,
-            query.before_finished_at,
+            *after_finished_at,
+            *before_finished_at,
         )?;
 
-        if let Some(limit) = query.limit {
-            batches = batches.into_iter().rev().take(limit as usize).collect();
+        if let Some(limit) = limit {
+            batches = if query.reverse.unwrap_or_default() {
+                batches.into_iter().take(*limit as usize).collect()
+            } else {
+                batches.into_iter().rev().take(*limit as usize).collect()
+            };
         }
 
         Ok(batches)
@@ -1305,10 +1344,13 @@ impl IndexScheduler {
         let rtxn = self.env.read_txn()?;
 
         let (tasks, total) = self.get_task_ids_from_authorized_indexes(&rtxn, &query, filters)?;
-        let tasks = self.get_existing_tasks(
-            &rtxn,
-            tasks.into_iter().rev().take(query.limit.unwrap_or(u32::MAX) as usize),
-        )?;
+        let tasks = if query.reverse.unwrap_or_default() {
+            Box::new(tasks.into_iter()) as Box<dyn Iterator<Item = u32>>
+        } else {
+            Box::new(tasks.into_iter().rev()) as Box<dyn Iterator<Item = u32>>
+        };
+        let tasks =
+            self.get_existing_tasks(&rtxn, tasks.take(query.limit.unwrap_or(u32::MAX) as usize))?;
 
         let ProcessingTasks { batch, processing } =
             self.processing_tasks.read().map_err(|_| Error::CorruptedTaskQueue)?.clone();
@@ -1357,11 +1399,16 @@ impl IndexScheduler {
 
         let (batches, total) =
             self.get_batch_ids_from_authorized_indexes(&rtxn, &processing, &query, filters)?;
+        let batches = if query.reverse.unwrap_or_default() {
+            Box::new(batches.into_iter()) as Box<dyn Iterator<Item = u32>>
+        } else {
+            Box::new(batches.into_iter().rev()) as Box<dyn Iterator<Item = u32>>
+        };
 
         let batches = self.get_existing_batches(
             &rtxn,
             &processing,
-            batches.into_iter().rev().take(query.limit.unwrap_or(u32::MAX) as usize),
+            batches.take(query.limit.unwrap_or(u32::MAX) as usize),
         )?;
 
         Ok((batches, total))
@@ -1541,7 +1588,7 @@ impl IndexScheduler {
         drop(rtxn);
 
         // 1. store the starting date with the bitmap of processing tasks.
-        let ids = batch.ids();
+        let mut ids = batch.ids();
         let processed_tasks = ids.len();
 
         // We reset the must_stop flag to be sure that we don't stop processing tasks
@@ -1578,6 +1625,7 @@ impl IndexScheduler {
 
         processing_batch.finished();
         let mut wtxn = self.env.write_txn().map_err(Error::HeedTransaction)?;
+        let mut canceled = RoaringBitmap::new();
 
         match res {
             Ok(tasks) => {
@@ -1587,7 +1635,6 @@ impl IndexScheduler {
                 let mut success = 0;
                 let mut failure = 0;
                 let mut canceled_by = None;
-                let mut canceled = RoaringBitmap::new();
 
                 #[allow(unused_variables)]
                 for (i, mut task) in tasks.into_iter().enumerate() {
@@ -1678,9 +1725,12 @@ impl IndexScheduler {
             }
         }
 
-        let processed = self.processing_tasks.write().unwrap().stop_processing();
+        self.processing_tasks.write().unwrap().stop_processing();
+        // We must re-add the canceled task so they're part of the same batch.
+        // processed.processing |= canceled;
+        ids |= canceled;
 
-        self.write_batch(&mut wtxn, processing_batch, &processed.processing)?;
+        self.write_batch(&mut wtxn, processing_batch, &ids)?;
 
         #[cfg(test)]
         self.maybe_fail(tests::FailureLocation::CommittingWtxn)?;
@@ -1710,7 +1760,7 @@ impl IndexScheduler {
         })?;
 
         // We shouldn't crash the tick function if we can't send data to the webhook.
-        let _ = self.notify_webhook(&processed.processing);
+        let _ = self.notify_webhook(&ids);
 
         #[cfg(test)]
         self.breakpoint(Breakpoint::AfterProcessing);
@@ -4144,7 +4194,6 @@ mod tests {
             tasks: [0, 1, 2, 3].into_iter().collect(),
         };
         let task_cancelation = index_scheduler.register(kind, None, false).unwrap();
-        println!("HEEERE");
         handle.advance_n_successful_batches(1);
 
         snapshot!(snapshot_index_scheduler(&index_scheduler), name: "start");

crates/index-scheduler/src/snapshots/lib.rs/cancel_enqueued_task/cancel_processed.snap

@@ -43,7 +43,7 @@ catto [0,]
 0 {uid: 0, details: {"receivedDocuments":1,"indexedDocuments":0,"matchedTasks":1,"canceledTasks":1,"originalFilter":"test_query"}, stats: {"totalNbTasks":2,"status":{"succeeded":1,"canceled":1},"types":{"documentAdditionOrUpdate":1,"taskCancelation":1},"indexUids":{"catto":1}}, }
 ----------------------------------------------------------------------
 ### Batch to tasks mapping:
-0 [1,]
+0 [0,1,]
 ----------------------------------------------------------------------
 ### Batches Status:
 succeeded [0,]
@@ -67,6 +67,5 @@ catto [0,]
 [timestamp] [0,]
 ----------------------------------------------------------------------
 ### File Store:
-00000000-0000-0000-0000-000000000000
 
 ----------------------------------------------------------------------

crates/index-scheduler/src/snapshots/lib.rs/cancel_mix_of_tasks/cancel_processed.snap

@@ -55,7 +55,7 @@ catto: { number_of_documents: 1, field_distribution: {"id": 1} }
 ----------------------------------------------------------------------
 ### Batch to tasks mapping:
 0 [0,]
-1 [3,]
+1 [1,2,3,]
 ----------------------------------------------------------------------
 ### Batches Status:
 succeeded [0,1,]
@@ -84,7 +84,5 @@ wolfo [1,]
 [timestamp] [1,]
 ----------------------------------------------------------------------
 ### File Store:
-00000000-0000-0000-0000-000000000001
-00000000-0000-0000-0000-000000000002
 
 ----------------------------------------------------------------------

crates/index-scheduler/src/snapshots/lib.rs/cancel_processing_dump/cancel_processed.snap

@@ -42,7 +42,7 @@ canceled [0,]
 0 {uid: 0, details: {"matchedTasks":1,"canceledTasks":1,"originalFilter":"cancel dump"}, stats: {"totalNbTasks":2,"status":{"succeeded":1,"canceled":1},"types":{"taskCancelation":1,"dumpCreation":1},"indexUids":{}}, }
 ----------------------------------------------------------------------
 ### Batch to tasks mapping:
-0 [1,]
+0 [0,1,]
 ----------------------------------------------------------------------
 ### Batches Status:
 succeeded [0,]

crates/index-scheduler/src/snapshots/lib.rs/cancel_processing_task/cancel_processed.snap

@@ -44,7 +44,7 @@ catto: { number_of_documents: 0, field_distribution: {} }
 0 {uid: 0, details: {"receivedDocuments":1,"indexedDocuments":0,"matchedTasks":1,"canceledTasks":1,"originalFilter":"test_query"}, stats: {"totalNbTasks":2,"status":{"succeeded":1,"canceled":1},"types":{"documentAdditionOrUpdate":1,"taskCancelation":1},"indexUids":{"catto":1}}, }
 ----------------------------------------------------------------------
 ### Batch to tasks mapping:
-0 [1,]
+0 [0,1,]
 ----------------------------------------------------------------------
 ### Batches Status:
 succeeded [0,]
@@ -68,6 +68,5 @@ catto [0,]
 [timestamp] [0,]
 ----------------------------------------------------------------------
 ### File Store:
-00000000-0000-0000-0000-000000000000
 
 ----------------------------------------------------------------------

crates/index-scheduler/src/snapshots/lib.rs/query_batches_canceled_by/start.snap

@@ -54,7 +54,7 @@ catto: { number_of_documents: 0, field_distribution: {} }
 ----------------------------------------------------------------------
 ### Batch to tasks mapping:
 0 [0,]
-1 [3,]
+1 [1,2,3,]
 ----------------------------------------------------------------------
 ### Batches Status:
 succeeded [0,1,]

crates/index-scheduler/src/snapshots/lib.rs/query_tasks_canceled_by/start.snap

@@ -54,7 +54,7 @@ catto: { number_of_documents: 0, field_distribution: {} }
 ----------------------------------------------------------------------
 ### Batch to tasks mapping:
 0 [0,]
-1 [3,]
+1 [1,2,3,]
 ----------------------------------------------------------------------
 ### Batches Status:
 succeeded [0,1,]

crates/index-scheduler/src/utils.rs

@@ -211,9 +211,10 @@ impl IndexScheduler {
         Ok(())
     }
 
-    /// Convert an iterator to a `Vec` of tasks. The tasks MUST exist or a
-    /// `CorruptedTaskQueue` error will be throwed.
-    pub(crate) fn get_existing_tasks_with_processing_batch(
+    /// Convert an iterator to a `Vec` of tasks and edit the `ProcessingBatch` to add the given tasks.
+    ///
+    /// The tasks MUST exist, or a `CorruptedTaskQueue` error will be thrown.
+    pub(crate) fn get_existing_tasks_for_processing_batch(
         &self,
         rtxn: &RoTxn,
         processing_batch: &mut ProcessingBatch,
@@ -232,7 +233,7 @@ impl IndexScheduler {
     }
 
     /// Convert an iterator to a `Vec` of tasks. The tasks MUST exist or a
-    /// `CorruptedTaskQueue` error will be throwed.
+    /// `CorruptedTaskQueue` error will be thrown.
     pub(crate) fn get_existing_tasks(
         &self,
         rtxn: &RoTxn,
@@ -247,7 +248,7 @@ impl IndexScheduler {
     }
 
     /// Convert an iterator to a `Vec` of batches. The batches MUST exist or a
-    /// `CorruptedTaskQueue` error will be throwed.
+    /// `CorruptedTaskQueue` error will be thrown.
     pub(crate) fn get_existing_batches(
         &self,
         rtxn: &RoTxn,
@@ -270,16 +271,10 @@ impl IndexScheduler {
     pub(crate) fn update_task(&self, wtxn: &mut RwTxn, task: &Task) -> Result<()> {
         let old_task = self.get_task(wtxn, task.uid)?.ok_or(Error::CorruptedTaskQueue)?;
 
-        dbg!(&task);
-
+        debug_assert!(old_task != *task);
         debug_assert_eq!(old_task.uid, task.uid);
         debug_assert!(old_task.batch_uid.is_none() && task.batch_uid.is_some());
 
-        // TODO: This shouldn't ever happen, we should assert it
-        if old_task == *task {
-            return Ok(());
-        }
-
         if old_task.status != task.status {
             self.update_status(wtxn, old_task.status, |bitmap| {
                 bitmap.remove(task.uid);
@@ -505,10 +500,9 @@ pub(crate) fn remove_task_datetime(
     Ok(())
 }
 
-// TODO: Rename the function since it also applies to batches
-pub(crate) fn keep_tasks_within_datetimes(
+pub(crate) fn keep_ids_within_datetimes(
     rtxn: &RoTxn,
-    tasks: &mut RoaringBitmap,
+    ids: &mut RoaringBitmap,
     database: Database<BEI128, CboRoaringBitmapCodec>,
     after: Option<OffsetDateTime>,
     before: Option<OffsetDateTime>,
@@ -519,15 +513,15 @@ pub(crate) fn keep_tasks_within_datetimes(
         (Some(after), None) => (Bound::Excluded(*after), Bound::Unbounded),
         (Some(after), Some(before)) => (Bound::Excluded(*after), Bound::Excluded(*before)),
     };
-    let mut collected_task_ids = RoaringBitmap::new();
+    let mut collected_ids = RoaringBitmap::new();
     let start = map_bound(start, |b| b.unix_timestamp_nanos());
     let end = map_bound(end, |b| b.unix_timestamp_nanos());
     let iter = database.range(rtxn, &(start, end))?;
     for r in iter {
-        let (_timestamp, task_ids) = r?;
-        collected_task_ids |= task_ids;
+        let (_timestamp, ids) = r?;
+        collected_ids |= ids;
     }
-    *tasks &= collected_task_ids;
+    *ids &= collected_ids;
     Ok(())
 }
 

crates/meilisearch-types/src/error.rs

@@ -318,6 +318,7 @@ InvalidTaskBeforeStartedAt            , InvalidRequest       , BAD_REQUEST ;
 InvalidTaskCanceledBy                 , InvalidRequest       , BAD_REQUEST ;
 InvalidTaskFrom                       , InvalidRequest       , BAD_REQUEST ;
 InvalidTaskLimit                      , InvalidRequest       , BAD_REQUEST ;
+InvalidTaskReverse                    , InvalidRequest       , BAD_REQUEST ;
 InvalidTaskStatuses                   , InvalidRequest       , BAD_REQUEST ;
 InvalidTaskTypes                      , InvalidRequest       , BAD_REQUEST ;
 InvalidTaskUids                       , InvalidRequest       , BAD_REQUEST  ;

crates/meilisearch/src/routes/tasks.rs

@@ -42,6 +42,8 @@ pub struct TasksFilterQuery {
     pub limit: Param<u32>,
     #[deserr(default, error = DeserrQueryParamError<InvalidTaskFrom>)]
     pub from: Option<Param<TaskId>>,
+    #[deserr(default, error = DeserrQueryParamError<InvalidTaskReverse>)]
+    pub reverse: Option<Param<bool>>,
 
     #[deserr(default, error = DeserrQueryParamError<InvalidBatchUids>)]
     pub batch_uids: OptionStarOrList<BatchId>,
@@ -76,6 +78,7 @@ impl TasksFilterQuery {
         Query {
             limit: Some(self.limit.0),
             from: self.from.as_deref().copied(),
+            reverse: self.reverse.as_deref().copied(),
             batch_uids: self.batch_uids.merge_star_and_none(),
             statuses: self.statuses.merge_star_and_none(),
             types: self.types.merge_star_and_none(),
@@ -149,6 +152,7 @@ impl TaskDeletionOrCancelationQuery {
         Query {
             limit: None,
             from: None,
+            reverse: None,
             batch_uids: self.batch_uids.merge_star_and_none(),
             statuses: self.statuses.merge_star_and_none(),
             types: self.types.merge_star_and_none(),
@@ -709,14 +713,14 @@ mod tests {
         {
             let params = "from=12&limit=15&indexUids=toto,tata-78&statuses=succeeded,enqueued&afterEnqueuedAt=2012-04-23&uids=1,2,3";
             let query = deserr_query_params::<TasksFilterQuery>(params).unwrap();
-            snapshot!(format!("{:?}", query), @r###"TasksFilterQuery { limit: Param(15), from: Some(Param(12)), batch_uids: None, uids: List([1, 2, 3]), canceled_by: None, types: None, statuses: List([Succeeded, Enqueued]), index_uids: List([IndexUid("toto"), IndexUid("tata-78")]), after_enqueued_at: Other(2012-04-24 0:00:00.0 +00:00:00), before_enqueued_at: None, after_started_at: None, before_started_at: None, after_finished_at: None, before_finished_at: None }"###);
+            snapshot!(format!("{:?}", query), @r###"TasksFilterQuery { limit: Param(15), from: Some(Param(12)), reverse: None, batch_uids: None, uids: List([1, 2, 3]), canceled_by: None, types: None, statuses: List([Succeeded, Enqueued]), index_uids: List([IndexUid("toto"), IndexUid("tata-78")]), after_enqueued_at: Other(2012-04-24 0:00:00.0 +00:00:00), before_enqueued_at: None, after_started_at: None, before_started_at: None, after_finished_at: None, before_finished_at: None }"###);
         }
         {
             // Stars should translate to `None` in the query
             // Verify value of the default limit
             let params = "indexUids=*&statuses=succeeded,*&afterEnqueuedAt=2012-04-23&uids=1,2,3";
             let query = deserr_query_params::<TasksFilterQuery>(params).unwrap();
-            snapshot!(format!("{:?}", query), @"TasksFilterQuery { limit: Param(20), from: None, batch_uids: None, uids: List([1, 2, 3]), canceled_by: None, types: None, statuses: Star, index_uids: Star, after_enqueued_at: Other(2012-04-24 0:00:00.0 +00:00:00), before_enqueued_at: None, after_started_at: None, before_started_at: None, after_finished_at: None, before_finished_at: None }");
+            snapshot!(format!("{:?}", query), @"TasksFilterQuery { limit: Param(20), from: None, reverse: None, batch_uids: None, uids: List([1, 2, 3]), canceled_by: None, types: None, statuses: Star, index_uids: Star, after_enqueued_at: Other(2012-04-24 0:00:00.0 +00:00:00), before_enqueued_at: None, after_started_at: None, before_started_at: None, after_finished_at: None, before_finished_at: None }");
         }
         {
             // Stars should also translate to `None` in task deletion/cancelation queries

crates/meilisearch/src/search/mod.rs

@@ -1733,7 +1733,10 @@ fn format_fields(
     // select the attributes to retrieve
     let displayable_names =
         displayable_ids.iter().map(|&fid| field_ids_map.name(fid).expect("Missing field name"));
-    permissive_json_pointer::map_leaf_values(&mut document, displayable_names, |key, value| {
+    permissive_json_pointer::map_leaf_values(
+        &mut document,
+        displayable_names,
+        |key, array_indices, value| {
             // To get the formatting option of each key we need to see all the rules that applies
             // to the value and merge them together. eg. If a user said he wanted to highlight `doggo`
             // and crop `doggo.name`. `doggo.name` needs to be highlighted + cropped while `doggo.age` is only
@@ -1764,6 +1767,7 @@ fn format_fields(
                 format,
                 &mut infos,
                 compute_matches,
+                array_indices,
                 locales,
             );
 
@@ -1772,7 +1776,8 @@ fn format_fields(
                     matches.insert(key.to_owned(), infos);
                 }
             }
-    });
+        },
+    );
 
     let selectors = formatted_options
         .keys()
@@ -1790,13 +1795,14 @@ fn format_value(
     format_options: Option<FormatOptions>,
     infos: &mut Vec<MatchBounds>,
     compute_matches: bool,
+    array_indices: &[usize],
     locales: Option<&[Language]>,
 ) -> Value {
     match value {
         Value::String(old_string) => {
             let mut matcher = builder.build(&old_string, locales);
             if compute_matches {
-                let matches = matcher.matches();
+                let matches = matcher.matches(array_indices);
                 infos.extend_from_slice(&matches[..]);
             }
 
@@ -1808,51 +1814,15 @@ fn format_value(
                 None => Value::String(old_string),
             }
         }
-        Value::Array(values) => Value::Array(
-            values
-                .into_iter()
-                .map(|v| {
-                    format_value(
-                        v,
-                        builder,
-                        format_options.map(|format_options| FormatOptions {
-                            highlight: format_options.highlight,
-                            crop: None,
-                        }),
-                        infos,
-                        compute_matches,
-                        locales,
-                    )
-                })
-                .collect(),
-        ),
-        Value::Object(object) => Value::Object(
-            object
-                .into_iter()
-                .map(|(k, v)| {
-                    (
-                        k,
-                        format_value(
-                            v,
-                            builder,
-                            format_options.map(|format_options| FormatOptions {
-                                highlight: format_options.highlight,
-                                crop: None,
-                            }),
-                            infos,
-                            compute_matches,
-                            locales,
-                        ),
-                    )
-                })
-                .collect(),
-        ),
+        // `map_leaf_values` makes sure this is only called for leaf fields
+        Value::Array(_) => unreachable!(),
+        Value::Object(_) => unreachable!(),
         Value::Number(number) => {
             let s = number.to_string();
 
             let mut matcher = builder.build(&s, locales);
             if compute_matches {
-                let matches = matcher.matches();
+                let matches = matcher.matches(array_indices);
                 infos.extend_from_slice(&matches[..]);
             }
 

crates/meilisearch/tests/batches/errors.rs

@@ -114,6 +114,33 @@ async fn batch_bad_from() {
     "#);
 }
 
+#[actix_rt::test]
+async fn bask_bad_reverse() {
+    let server = Server::new_shared();
+
+    let (response, code) = server.batches_filter("reverse=doggo").await;
+    snapshot!(code, @"400 Bad Request");
+    snapshot!(response, @r###"
+    {
+      "message": "Invalid value in parameter `reverse`: could not parse `doggo` as a boolean, expected either `true` or `false`",
+      "code": "invalid_task_reverse",
+      "type": "invalid_request",
+      "link": "https://docs.meilisearch.com/errors#invalid_task_reverse"
+    }
+    "###);
+
+    let (response, code) = server.batches_filter("reverse=*").await;
+    snapshot!(code, @"400 Bad Request");
+    snapshot!(response, @r###"
+    {
+      "message": "Invalid value in parameter `reverse`: could not parse `*` as a boolean, expected either `true` or `false`",
+      "code": "invalid_task_reverse",
+      "type": "invalid_request",
+      "link": "https://docs.meilisearch.com/errors#invalid_task_reverse"
+    }
+    "###);
+}
+
 #[actix_rt::test]
 async fn batch_bad_after_enqueued_at() {
     let server = Server::new_shared();

crates/meilisearch/tests/batches/mod.rs

@@ -49,6 +49,44 @@ async fn list_batches() {
     assert_eq!(response["results"].as_array().unwrap().len(), 2);
 }
 
+#[actix_rt::test]
+async fn list_batches_pagination_and_reverse() {
+    let server = Server::new().await;
+    // First of all we want to create a lot of batches very quickly. The fastest way is to delete a lot of unexisting indexes
+    let mut last_batch = None;
+    for i in 0..10 {
+        let index = server.index(format!("test-{i}"));
+        last_batch = Some(index.create(None).await.0.uid());
+    }
+    server.wait_task(last_batch.unwrap()).await;
+
+    let (response, code) = server.batches_filter("limit=3").await;
+    assert_eq!(code, 200);
+    let results = response["results"].as_array().unwrap();
+    let batch_ids: Vec<_> = results.iter().map(|ret| ret["uid"].as_u64().unwrap()).collect();
+    snapshot!(format!("{batch_ids:?}"), @"[9, 8, 7]");
+
+    let (response, code) = server.batches_filter("limit=3&from=1").await;
+    assert_eq!(code, 200);
+    let results = response["results"].as_array().unwrap();
+    let batch_ids: Vec<_> = results.iter().map(|ret| ret["uid"].as_u64().unwrap()).collect();
+    snapshot!(format!("{batch_ids:?}"), @"[1, 0]");
+
+    // In reversed order
+
+    let (response, code) = server.batches_filter("limit=3&reverse=true").await;
+    assert_eq!(code, 200);
+    let results = response["results"].as_array().unwrap();
+    let batch_ids: Vec<_> = results.iter().map(|ret| ret["uid"].as_u64().unwrap()).collect();
+    snapshot!(format!("{batch_ids:?}"), @"[0, 1, 2]");
+
+    let (response, code) = server.batches_filter("limit=3&from=8&reverse=true").await;
+    assert_eq!(code, 200);
+    let results = response["results"].as_array().unwrap();
+    let batch_ids: Vec<_> = results.iter().map(|ret| ret["uid"].as_u64().unwrap()).collect();
+    snapshot!(format!("{batch_ids:?}"), @"[8, 9]");
+}
+
 #[actix_rt::test]
 async fn list_batches_with_star_filters() {
     let server = Server::new().await;
@@ -186,14 +224,14 @@ async fn get_batch_filter_error() {
 
     let (response, code) = server.batches_filter("lol=pied").await;
     assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
+    meili_snap::snapshot!(meili_snap::json_string!(response), @r#"
     {
-      "message": "Unknown parameter `lol`: expected one of `limit`, `from`, `batchUids`, `uids`, `canceledBy`, `types`, `statuses`, `indexUids`, `afterEnqueuedAt`, `beforeEnqueuedAt`, `afterStartedAt`, `beforeStartedAt`, `afterFinishedAt`, `beforeFinishedAt`",
+      "message": "Unknown parameter `lol`: expected one of `limit`, `from`, `reverse`, `batchUids`, `uids`, `canceledBy`, `types`, `statuses`, `indexUids`, `afterEnqueuedAt`, `beforeEnqueuedAt`, `afterStartedAt`, `beforeStartedAt`, `afterFinishedAt`, `beforeFinishedAt`",
       "code": "bad_request",
       "type": "invalid_request",
       "link": "https://docs.meilisearch.com/errors#bad_request"
     }
-    "###);
+    "#);
 
     let (response, code) = server.batches_filter("uids=pied").await;
     assert_eq!(code, 400, "{}", response);

crates/meilisearch/tests/search/formatted.rs

@@ -208,7 +208,10 @@ async fn format_nested() {
                         "doggos.name": [
                           {
                             "start": 0,
-                            "length": 5
+                            "length": 5,
+                            "indices": [
+                              0
+                            ]
                           }
                         ]
                       }

crates/meilisearch/tests/snapshot/mod.rs

@@ -65,7 +65,6 @@ async fn perform_snapshot() {
     let next_task = task.uid() + 1;
     loop {
         let (value, code) = index.get_task(next_task).await;
-        dbg!(&value);
         if code != 404 && value["status"].as_str() == Some("succeeded") {
             break;
         }

crates/meilisearch/tests/tasks/errors.rs

@@ -279,6 +279,55 @@ async fn task_bad_from() {
     "###);
 }
 
+#[actix_rt::test]
+async fn task_bad_reverse() {
+    let server = Server::new_shared();
+
+    let (response, code) = server.tasks_filter("reverse=doggo").await;
+    snapshot!(code, @"400 Bad Request");
+    snapshot!(response, @r###"
+    {
+      "message": "Invalid value in parameter `reverse`: could not parse `doggo` as a boolean, expected either `true` or `false`",
+      "code": "invalid_task_reverse",
+      "type": "invalid_request",
+      "link": "https://docs.meilisearch.com/errors#invalid_task_reverse"
+    }
+    "###);
+
+    let (response, code) = server.tasks_filter("reverse=*").await;
+    snapshot!(code, @"400 Bad Request");
+    snapshot!(response, @r###"
+    {
+      "message": "Invalid value in parameter `reverse`: could not parse `*` as a boolean, expected either `true` or `false`",
+      "code": "invalid_task_reverse",
+      "type": "invalid_request",
+      "link": "https://docs.meilisearch.com/errors#invalid_task_reverse"
+    }
+    "###);
+
+    let (response, code) = server.cancel_tasks("reverse=doggo").await;
+    snapshot!(code, @"400 Bad Request");
+    snapshot!(response, @r#"
+    {
+      "message": "Unknown parameter `reverse`: expected one of `uids`, `batchUids`, `canceledBy`, `types`, `statuses`, `indexUids`, `afterEnqueuedAt`, `beforeEnqueuedAt`, `afterStartedAt`, `beforeStartedAt`, `afterFinishedAt`, `beforeFinishedAt`",
+      "code": "bad_request",
+      "type": "invalid_request",
+      "link": "https://docs.meilisearch.com/errors#bad_request"
+    }
+    "#);
+
+    let (response, code) = server.delete_tasks("reverse=doggo").await;
+    snapshot!(code, @"400 Bad Request");
+    snapshot!(response, @r#"
+    {
+      "message": "Unknown parameter `reverse`: expected one of `uids`, `batchUids`, `canceledBy`, `types`, `statuses`, `indexUids`, `afterEnqueuedAt`, `beforeEnqueuedAt`, `afterStartedAt`, `beforeStartedAt`, `afterFinishedAt`, `beforeFinishedAt`",
+      "code": "bad_request",
+      "type": "invalid_request",
+      "link": "https://docs.meilisearch.com/errors#bad_request"
+    }
+    "#);
+}
+
 #[actix_rt::test]
 async fn task_bad_after_enqueued_at() {
     let server = Server::new_shared();

crates/meilisearch/tests/tasks/mod.rs

@@ -62,6 +62,44 @@ async fn list_tasks() {
     assert_eq!(response["results"].as_array().unwrap().len(), 2);
 }
 
+#[actix_rt::test]
+async fn list_tasks_pagination_and_reverse() {
+    let server = Server::new().await;
+    // First of all we want to create a lot of tasks very quickly. The fastest way is to delete a lot of unexisting indexes
+    let mut last_task = None;
+    for i in 0..10 {
+        let index = server.index(format!("test-{i}"));
+        last_task = Some(index.create(None).await.0.uid());
+    }
+    server.wait_task(last_task.unwrap()).await;
+
+    let (response, code) = server.tasks_filter("limit=3").await;
+    assert_eq!(code, 200);
+    let results = response["results"].as_array().unwrap();
+    let task_ids: Vec<_> = results.iter().map(|ret| ret["uid"].as_u64().unwrap()).collect();
+    snapshot!(format!("{task_ids:?}"), @"[9, 8, 7]");
+
+    let (response, code) = server.tasks_filter("limit=3&from=1").await;
+    assert_eq!(code, 200);
+    let results = response["results"].as_array().unwrap();
+    let task_ids: Vec<_> = results.iter().map(|ret| ret["uid"].as_u64().unwrap()).collect();
+    snapshot!(format!("{task_ids:?}"), @"[1, 0]");
+
+    // In reversed order
+
+    let (response, code) = server.tasks_filter("limit=3&reverse=true").await;
+    assert_eq!(code, 200);
+    let results = response["results"].as_array().unwrap();
+    let task_ids: Vec<_> = results.iter().map(|ret| ret["uid"].as_u64().unwrap()).collect();
+    snapshot!(format!("{task_ids:?}"), @"[0, 1, 2]");
+
+    let (response, code) = server.tasks_filter("limit=3&from=8&reverse=true").await;
+    assert_eq!(code, 200);
+    let results = response["results"].as_array().unwrap();
+    let task_ids: Vec<_> = results.iter().map(|ret| ret["uid"].as_u64().unwrap()).collect();
+    snapshot!(format!("{task_ids:?}"), @"[8, 9]");
+}
+
 #[actix_rt::test]
 async fn list_tasks_with_star_filters() {
     let server = Server::new().await;
@@ -193,131 +231,6 @@ async fn list_tasks_status_and_type_filtered() {
     assert_eq!(response["results"].as_array().unwrap().len(), 2);
 }
 
-#[actix_rt::test]
-async fn get_task_filter_error() {
-    let server = Server::new().await;
-
-    let (response, code) = server.tasks_filter("lol=pied").await;
-    assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
-    {
-      "message": "Unknown parameter `lol`: expected one of `limit`, `from`, `batchUids`, `uids`, `canceledBy`, `types`, `statuses`, `indexUids`, `afterEnqueuedAt`, `beforeEnqueuedAt`, `afterStartedAt`, `beforeStartedAt`, `afterFinishedAt`, `beforeFinishedAt`",
-      "code": "bad_request",
-      "type": "invalid_request",
-      "link": "https://docs.meilisearch.com/errors#bad_request"
-    }
-    "###);
-
-    let (response, code) = server.tasks_filter("uids=pied").await;
-    assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
-    {
-      "message": "Invalid value in parameter `uids`: could not parse `pied` as a positive integer",
-      "code": "invalid_task_uids",
-      "type": "invalid_request",
-      "link": "https://docs.meilisearch.com/errors#invalid_task_uids"
-    }
-    "###);
-
-    let (response, code) = server.tasks_filter("from=pied").await;
-    assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
-    {
-      "message": "Invalid value in parameter `from`: could not parse `pied` as a positive integer",
-      "code": "invalid_task_from",
-      "type": "invalid_request",
-      "link": "https://docs.meilisearch.com/errors#invalid_task_from"
-    }
-    "###);
-
-    let (response, code) = server.tasks_filter("beforeStartedAt=pied").await;
-    assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
-    {
-      "message": "Invalid value in parameter `beforeStartedAt`: `pied` is an invalid date-time. It should follow the YYYY-MM-DD or RFC 3339 date-time format.",
-      "code": "invalid_task_before_started_at",
-      "type": "invalid_request",
-      "link": "https://docs.meilisearch.com/errors#invalid_task_before_started_at"
-    }
-    "###);
-}
-
-#[actix_rt::test]
-async fn delete_task_filter_error() {
-    let server = Server::new().await;
-
-    let (response, code) = server.delete_tasks("").await;
-    assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
-    {
-      "message": "Query parameters to filter the tasks to delete are missing. Available query parameters are: `uids`, `indexUids`, `statuses`, `types`, `canceledBy`, `beforeEnqueuedAt`, `afterEnqueuedAt`, `beforeStartedAt`, `afterStartedAt`, `beforeFinishedAt`, `afterFinishedAt`.",
-      "code": "missing_task_filters",
-      "type": "invalid_request",
-      "link": "https://docs.meilisearch.com/errors#missing_task_filters"
-    }
-    "###);
-
-    let (response, code) = server.delete_tasks("lol=pied").await;
-    assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
-    {
-      "message": "Unknown parameter `lol`: expected one of `uids`, `batchUids`, `canceledBy`, `types`, `statuses`, `indexUids`, `afterEnqueuedAt`, `beforeEnqueuedAt`, `afterStartedAt`, `beforeStartedAt`, `afterFinishedAt`, `beforeFinishedAt`",
-      "code": "bad_request",
-      "type": "invalid_request",
-      "link": "https://docs.meilisearch.com/errors#bad_request"
-    }
-    "###);
-
-    let (response, code) = server.delete_tasks("uids=pied").await;
-    assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
-    {
-      "message": "Invalid value in parameter `uids`: could not parse `pied` as a positive integer",
-      "code": "invalid_task_uids",
-      "type": "invalid_request",
-      "link": "https://docs.meilisearch.com/errors#invalid_task_uids"
-    }
-    "###);
-}
-
-#[actix_rt::test]
-async fn cancel_task_filter_error() {
-    let server = Server::new().await;
-
-    let (response, code) = server.cancel_tasks("").await;
-    assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
-    {
-      "message": "Query parameters to filter the tasks to cancel are missing. Available query parameters are: `uids`, `indexUids`, `statuses`, `types`, `canceledBy`, `beforeEnqueuedAt`, `afterEnqueuedAt`, `beforeStartedAt`, `afterStartedAt`, `beforeFinishedAt`, `afterFinishedAt`.",
-      "code": "missing_task_filters",
-      "type": "invalid_request",
-      "link": "https://docs.meilisearch.com/errors#missing_task_filters"
-    }
-    "###);
-
-    let (response, code) = server.cancel_tasks("lol=pied").await;
-    assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
-    {
-      "message": "Unknown parameter `lol`: expected one of `uids`, `batchUids`, `canceledBy`, `types`, `statuses`, `indexUids`, `afterEnqueuedAt`, `beforeEnqueuedAt`, `afterStartedAt`, `beforeStartedAt`, `afterFinishedAt`, `beforeFinishedAt`",
-      "code": "bad_request",
-      "type": "invalid_request",
-      "link": "https://docs.meilisearch.com/errors#bad_request"
-    }
-    "###);
-
-    let (response, code) = server.cancel_tasks("uids=pied").await;
-    assert_eq!(code, 400, "{}", response);
-    meili_snap::snapshot!(meili_snap::json_string!(response), @r###"
-    {
-      "message": "Invalid value in parameter `uids`: could not parse `pied` as a positive integer",
-      "code": "invalid_task_uids",
-      "type": "invalid_request",
-      "link": "https://docs.meilisearch.com/errors#invalid_task_uids"
-    }
-    "###);
-}
-
 macro_rules! assert_valid_summarized_task {
     ($response:expr, $task_type:literal, $index:literal) => {{
         assert_eq!($response.as_object().unwrap().len(), 5);

crates/meilitool/src/upgrade/v1_10.rs

@@ -76,13 +76,6 @@ fn update_index_stats(
 ) -> anyhow::Result<()> {
     let ctx = || format!("while updating index stats for index `{index_uid}`");
 
-    let stats: Option<&str> = index_stats
-        .remap_data_type::<Str>()
-        .get(sched_wtxn, &index_uuid)
-        .with_context(ctx)
-        .with_context(|| "While reading value")?;
-    dbg!(stats);
-
     let stats: Option<v1_9::IndexStats> = index_stats
         .remap_data_type::<SerdeJson<v1_9::IndexStats>>()
         .get(sched_wtxn, &index_uuid)

crates/milli/src/search/new/matches/mod.rs

@@ -105,6 +105,8 @@ impl FormatOptions {
 pub struct MatchBounds {
     pub start: usize,
     pub length: usize,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub indices: Option<Vec<usize>>,
 }
 
 /// Structure used to analyze a string, compute words that match,
@@ -220,15 +222,20 @@ impl<'t, 'tokenizer> Matcher<'t, 'tokenizer, '_, '_> {
     }
 
     /// Returns boundaries of the words that match the query.
-    pub fn matches(&mut self) -> Vec<MatchBounds> {
+    pub fn matches(&mut self, array_indices: &[usize]) -> Vec<MatchBounds> {
         match &self.matches {
-            None => self.compute_matches().matches(),
+            None => self.compute_matches().matches(array_indices),
             Some((tokens, matches)) => matches
                 .iter()
                 .map(|m| MatchBounds {
                     start: tokens[m.get_first_token_pos()].byte_start,
                     // TODO: Why is this in chars, while start is in bytes?
                     length: m.char_count,
+                    indices: if array_indices.is_empty() {
+                        None
+                    } else {
+                        Some(array_indices.to_owned())
+                    },
                 })
                 .collect(),
         }

crates/permissive-json-pointer/src/lib.rs

@@ -45,7 +45,7 @@ fn contained_in(selector: &str, key: &str) -> bool {
 /// map_leaf_values(
 ///     value.as_object_mut().unwrap(),
 ///     ["jean.race.name"],
-///     |key, value| match (value, key) {
+///     |key, _array_indices, value| match (value, key) {
 ///         (Value::String(name), "jean.race.name") => *name = "patou".to_string(),
 ///         _ => unreachable!(),
 ///     },
@@ -66,17 +66,18 @@ fn contained_in(selector: &str, key: &str) -> bool {
 pub fn map_leaf_values<'a>(
     value: &mut Map<String, Value>,
     selectors: impl IntoIterator<Item = &'a str>,
-    mut mapper: impl FnMut(&str, &mut Value),
+    mut mapper: impl FnMut(&str, &[usize], &mut Value),
 ) {
     let selectors: Vec<_> = selectors.into_iter().collect();
-    map_leaf_values_in_object(value, &selectors, "", &mut mapper);
+    map_leaf_values_in_object(value, &selectors, "", &[], &mut mapper);
 }
 
 pub fn map_leaf_values_in_object(
     value: &mut Map<String, Value>,
     selectors: &[&str],
     base_key: &str,
-    mapper: &mut impl FnMut(&str, &mut Value),
+    array_indices: &[usize],
+    mapper: &mut impl FnMut(&str, &[usize], &mut Value),
 ) {
     for (key, value) in value.iter_mut() {
         let base_key = if base_key.is_empty() {
@@ -94,12 +95,12 @@ pub fn map_leaf_values_in_object(
         if should_continue {
             match value {
                 Value::Object(object) => {
-                    map_leaf_values_in_object(object, selectors, &base_key, mapper)
+                    map_leaf_values_in_object(object, selectors, &base_key, array_indices, mapper)
                 }
                 Value::Array(array) => {
-                    map_leaf_values_in_array(array, selectors, &base_key, mapper)
+                    map_leaf_values_in_array(array, selectors, &base_key, array_indices, mapper)
                 }
-                value => mapper(&base_key, value),
+                value => mapper(&base_key, array_indices, value),
             }
         }
     }
@@ -109,13 +110,24 @@ pub fn map_leaf_values_in_array(
     values: &mut [Value],
     selectors: &[&str],
     base_key: &str,
-    mapper: &mut impl FnMut(&str, &mut Value),
+    base_array_indices: &[usize],
+    mapper: &mut impl FnMut(&str, &[usize], &mut Value),
 ) {
-    for value in values.iter_mut() {
+    // This avoids allocating twice
+    let mut array_indices = Vec::with_capacity(base_array_indices.len() + 1);
+    array_indices.extend_from_slice(base_array_indices);
+    array_indices.push(0);
+
+    for (i, value) in values.iter_mut().enumerate() {
+        *array_indices.last_mut().unwrap() = i;
         match value {
-            Value::Object(object) => map_leaf_values_in_object(object, selectors, base_key, mapper),
-            Value::Array(array) => map_leaf_values_in_array(array, selectors, base_key, mapper),
-            value => mapper(base_key, value),
+            Value::Object(object) => {
+                map_leaf_values_in_object(object, selectors, base_key, &array_indices, mapper)
+            }
+            Value::Array(array) => {
+                map_leaf_values_in_array(array, selectors, base_key, &array_indices, mapper)
+            }
+            value => mapper(base_key, &array_indices, value),
         }
     }
 }
@@ -743,12 +755,14 @@ mod tests {
             }
         });
 
-        map_leaf_values(value.as_object_mut().unwrap(), ["jean.race.name"], |key, value| {
-            match (value, key) {
+        map_leaf_values(
+            value.as_object_mut().unwrap(),
+            ["jean.race.name"],
+            |key, _, value| match (value, key) {
                 (Value::String(name), "jean.race.name") => *name = S("patou"),
                 _ => unreachable!(),
-            }
-        });
+            },
+        );
 
         assert_eq!(
             value,
@@ -775,7 +789,7 @@ mod tests {
         });
 
         let mut calls = 0;
-        map_leaf_values(value.as_object_mut().unwrap(), ["jean"], |key, value| {
+        map_leaf_values(value.as_object_mut().unwrap(), ["jean"], |key, _, value| {
             calls += 1;
             match (value, key) {
                 (Value::String(name), "jean.race.name") => *name = S("patou"),
@@ -798,4 +812,52 @@ mod tests {
             })
         );
     }
+
+    #[test]
+    fn map_array() {
+        let mut value: Value = json!({
+            "no_array": "peter",
+            "simple": ["foo", "bar"],
+            "nested": [
+                {
+                    "a": [
+                        ["cat", "dog"],
+                        ["fox", "bear"],
+                    ],
+                    "b": "hi",
+                },
+                {
+                    "a": ["green", "blue"],
+                },
+            ],
+        });
+
+        map_leaf_values(
+            value.as_object_mut().unwrap(),
+            ["no_array", "simple", "nested"],
+            |_key, array_indices, value| {
+                *value = format!("{array_indices:?}").into();
+            },
+        );
+
+        assert_eq!(
+            value,
+            json!({
+                "no_array": "[]",
+                "simple": ["[0]", "[1]"],
+                "nested": [
+                    {
+                        "a": [
+                            ["[0, 0, 0]", "[0, 0, 1]"],
+                            ["[0, 1, 0]", "[0, 1, 1]"],
+                        ],
+                        "b": "[0]",
+                    },
+                    {
+                        "a": ["[1, 0]", "[1, 1]"],
+                    },
+                ],
+            })
+        );
+    }
 }