feat(storage): remove table watermarks of dropped tables (#13960)

proto/hummock.proto

@@ -168,6 +168,7 @@ message HummockVersionDelta {
   bool trivial_move = 6;
   repeated uint64 gc_object_ids = 7;
   map<uint32, TableWatermarks> new_table_watermarks = 8;
+  repeated uint32 removed_table_ids = 9;
 }
 
 message HummockVersionDeltas {

src/meta/src/hummock/manager/compaction_group_manager.rs

@@ -306,6 +306,7 @@ impl HummockManager {
                         .len() as u64
                         - 1,
                 );
+            new_version_delta.removed_table_ids.push(*table_id);
         }
 
         // Remove empty group, GC SSTs and remove metric.

src/storage/hummock_sdk/src/compaction_group/hummock_version_ext.rs

@@ -572,6 +572,9 @@ impl HummockVersion {
         }
         self.id = version_delta.id;
         self.max_committed_epoch = version_delta.max_committed_epoch;
+        for table_id in &version_delta.removed_table_ids {
+            let _ = self.table_watermarks.remove(table_id);
+        }
         for (table_id, table_watermarks) in &version_delta.new_table_watermarks {
             match self.table_watermarks.entry(*table_id) {
                 Entry::Occupied(mut entry) => {
@@ -1010,6 +1013,7 @@ pub fn build_version_delta_after_version(version: &HummockVersion) -> HummockVer
         group_deltas: Default::default(),
         gc_object_ids: vec![],
         new_table_watermarks: HashMap::new(),
+        removed_table_ids: vec![],
     }
 }