From 6494c75d31f5d28593dfc4f12e73216ff557f540 Mon Sep 17 00:00:00 2001
From: Spade  A <71589810+SpadeA-Tang@users.noreply.github.com>
Date: Thu, 23 Oct 2025 19:52:05 +0800
Subject: [PATCH] fix: collection level MMAP does not take effect for STRUCT
 (#44996)

issue: https://github.com/milvus-io/milvus/issues/42148

Signed-off-by: SpadeA <tangchenjie1210@gmail.com>
---
 internal/querycoordv2/task/utils.go | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/internal/querycoordv2/task/utils.go b/internal/querycoordv2/task/utils.go
index 709a662ef9..62307ad3a8 100644
--- a/internal/querycoordv2/task/utils.go
+++ b/internal/querycoordv2/task/utils.go
@@ -145,7 +145,6 @@ func packLoadSegmentRequest(
 		loadScope = querypb.LoadScope_Delta
 	}
 
-	// todo(SpadeA): consider struct fields
 	schema = applyCollectionMmapSetting(schema, collectionProperties)
 
 	return &querypb.LoadSegmentsRequest{
@@ -285,5 +284,16 @@ func applyCollectionMmapSetting(schema *schemapb.CollectionSchema,
 			})
 		}
 	}
+	for _, structField := range schema.GetStructArrayFields() {
+		for _, field := range structField.GetFields() {
+			if exist &&
+				!common.FieldHasMmapKey(schema, field.GetFieldID()) {
+				field.TypeParams = append(field.TypeParams, &commonpb.KeyValuePair{
+					Key:   common.MmapEnabledKey,
+					Value: strconv.FormatBool(collectionMmapEnabled),
+				})
+			}
+		}
+	}
 	return schema
 }