diff --git a/internal/datanode/compactor/mix_compactor.go b/internal/datanode/compactor/mix_compactor.go
index 18dc5b6f64..98a50614d8 100644
--- a/internal/datanode/compactor/mix_compactor.go
+++ b/internal/datanode/compactor/mix_compactor.go
@@ -355,8 +355,8 @@ func (t *mixCompactionTask) Compact() (*datapb.CompactionPlanResult, error) {
 				break
 			}
 		}
-		if len(t.plan.GetSegmentBinlogs()) <= 1 ||
-			len(t.plan.GetSegmentBinlogs()) > t.compactionParams.MaxSegmentMergeSort {
+
+		if len(t.plan.GetSegmentBinlogs()) > t.compactionParams.MaxSegmentMergeSort {
 			// sort merge is not applicable if there is only one segment or too many segments
 			sortMergeAppicable = false
 		}
@@ -365,7 +365,6 @@ func (t *mixCompactionTask) Compact() (*datapb.CompactionPlanResult, error) {
 	var res []*datapb.CompactionSegment
 	var err error
 	if sortMergeAppicable {
-		// TODO: the implementation of mergeSortMultipleSegments is not correct, also see issue: https://github.com/milvus-io/milvus/issues/43034
 		log.Info("compact by merge sort")
 		res, err = mergeSortMultipleSegments(ctxTimeout, t.plan, t.collectionID, t.partitionID, t.maxRows, t.binlogIO,
 			t.plan.GetSegmentBinlogs(), t.tr, t.currentTime, t.plan.GetCollectionTtl(), t.compactionParams, t.sortByFieldIDs)