diff --git a/pkg/fileservice/s3_fs_test.go b/pkg/fileservice/s3_fs_test.go
index 2e65d4402738b..c2c4bf496e9ec 100644
--- a/pkg/fileservice/s3_fs_test.go
+++ b/pkg/fileservice/s3_fs_test.go
@@ -874,6 +874,90 @@ func TestS3FSRangeReadSkipsFullObjectIOMergeBeforeDiskCacheUpdate(t *testing.T)
 	}
 }
 
+func TestS3FSRangeReadSkipsPrefetchFullObjectIOMerge(t *testing.T) {
+	ctx := context.Background()
+	fs, err := NewS3FS(
+		ctx,
+		ObjectStorageArguments{
+			Name:      "s3",
+			Endpoint:  "disk",
+			Bucket:    t.TempDir(),
+			KeyPrefix: time.Now().Format("2006-01-02.15:04:05.000000"),
+		},
+		CacheConfig{
+			DiskPath:     ptrTo(t.TempDir()),
+			DiskCapacity: ptrTo[toml.ByteSize](1 << 30),
+		},
+		nil,
+		false,
+		false,
+	)
+	assert.Nil(t, err)
+	defer fs.Close(ctx)
+
+	data := bytes.Repeat([]byte("abcd"), 1<<10)
+	err = fs.Write(ctx, IOVector{
+		FilePath: "foo/bar",
+		Entries: []IOEntry{
+			{
+				Size: int64(len(data)),
+				Data: data,
+			},
+		},
+		Policy: SkipDiskCache | SkipMemoryCache,
+	})
+	assert.Nil(t, err)
+
+	doneMerge, waitMerge := fs.ioMerger.Merge(IOMergeKey{
+		Path:       "foo/bar",
+		FullObject: true,
+	}, maxIOWaitDuration)
+	assert.NotNil(t, doneMerge)
+	assert.Nil(t, waitMerge)
+	releasedMerge := false
+	releaseMerge := func() {
+		if !releasedMerge {
+			doneMerge()
+			releasedMerge = true
+		}
+	}
+	defer releaseMerge()
+
+	type readResult struct {
+		data []byte
+		err  error
+	}
+	readDone := make(chan readResult, 1)
+	go func() {
+		vec := &IOVector{
+			FilePath: "foo/bar",
+			Entries: []IOEntry{
+				{
+					Offset: 5,
+					Size:   9,
+				},
+			},
+		}
+		err := fs.Read(ctx, vec)
+		defer vec.Release()
+		if err != nil {
+			readDone <- readResult{err: err}
+			return
+		}
+		readDone <- readResult{data: append([]byte(nil), vec.Entries[0].Data...)}
+	}()
+
+	select {
+	case result := <-readDone:
+		assert.Nil(t, result.err)
+		assert.Equal(t, data[5:14], result.data)
+	case <-time.After(2 * time.Second):
+		releaseMerge()
+		result := <-readDone
+		t.Fatalf("range read waited for prefetch full-object io merge: %v", result.err)
+	}
+}
+
 func TestS3FSReadFullObjectToDiskCacheStreamingDoesNotOpenReaderWhenCacheExists(t *testing.T) {
 	ctx := context.Background()
 	cache, err := NewDiskCache(ctx, t.TempDir(), fscache.ConstCapacity(1<<20), nil, false, nil, "")
@@ -952,6 +1036,118 @@ func TestS3FSReadFullObjectToDiskCacheStreamingReturnsReaderError(t *testing.T)
 	assert.Equal(t, int64(3), vector.Entries[0].Size)
 }
 
+func TestS3FSReadFullObjectToDiskCacheStreamingReadToEnd(t *testing.T) {
+	ctx := context.Background()
+	cache, err := NewDiskCache(ctx, t.TempDir(), fscache.ConstCapacity(1<<20), nil, false, nil, "")
+	assert.Nil(t, err)
+	defer cache.Close(ctx)
+
+	fs := &S3FS{
+		diskCache: cache,
+	}
+	vector := &IOVector{
+		FilePath: "foo/bar",
+		Entries: []IOEntry{
+			{
+				Offset: 6,
+				Size:   -1,
+			},
+		},
+	}
+
+	done, err := fs.readFullObjectToDiskCacheStreaming(
+		ctx,
+		vector,
+		"foo/bar",
+		func(context.Context, *int64, *int64) (io.ReadCloser, error) {
+			return io.NopCloser(bytes.NewReader([]byte("hello world"))), nil
+		},
+	)
+
+	assert.True(t, done)
+	assert.Nil(t, err)
+	assert.False(t, vector.Entries[0].done)
+	assert.Equal(t, []byte("world"), vector.Entries[0].Data)
+	assert.Equal(t, int64(5), vector.Entries[0].Size)
+}
+
+func TestS3FSReadFullObjectToDiskCacheStreamingUnexpectedEOF(t *testing.T) {
+	ctx := context.Background()
+	cache, err := NewDiskCache(ctx, t.TempDir(), fscache.ConstCapacity(1<<20), nil, false, nil, "")
+	assert.Nil(t, err)
+	defer cache.Close(ctx)
+
+	fs := &S3FS{
+		diskCache: cache,
+	}
+	vector := &IOVector{
+		FilePath: "foo/bar",
+		Entries: []IOEntry{
+			{
+				Offset: 6,
+				Size:   20,
+			},
+		},
+	}
+
+	done, err := fs.readFullObjectToDiskCacheStreaming(
+		ctx,
+		vector,
+		"foo/bar",
+		func(context.Context, *int64, *int64) (io.ReadCloser, error) {
+			return io.NopCloser(bytes.NewReader([]byte("hello world"))), nil
+		},
+	)
+
+	assert.True(t, done)
+	assert.True(t, moerr.IsMoErrCode(err, moerr.ErrUnexpectedEOF))
+	assert.False(t, vector.Entries[0].done)
+	assert.Nil(t, vector.Entries[0].Data)
+	assert.Equal(t, int64(20), vector.Entries[0].Size)
+}
+
+func TestS3FSShouldStreamFullObjectToDiskCacheExclusions(t *testing.T) {
+	ctx := context.Background()
+	cache, err := NewDiskCache(ctx, t.TempDir(), fscache.ConstCapacity(1<<20), nil, false, nil, "")
+	assert.Nil(t, err)
+	defer cache.Close(ctx)
+
+	fs := &S3FS{
+		diskCache: cache,
+	}
+
+	assert.False(t, fs.shouldStreamFullObjectToDiskCache(&IOVector{
+		FilePath: "foo/bar",
+		Entries: []IOEntry{
+			{
+				Size: 0,
+			},
+		},
+	}))
+
+	buf := new(bytes.Buffer)
+	assert.False(t, fs.shouldStreamFullObjectToDiskCache(&IOVector{
+		FilePath: "foo/bar",
+		Entries: []IOEntry{
+			{
+				Size:          3,
+				WriterForRead: buf,
+			},
+		},
+	}))
+
+	var reader io.ReadCloser
+	assert.False(t, fs.shouldStreamFullObjectToDiskCache(&IOVector{
+		FilePath: "foo/bar",
+		Entries: []IOEntry{
+			{
+				Size:              3,
+				ReadCloserForRead: &reader,
+			},
+		},
+	}))
+}
+
 type errorReadCloser struct {
 	reader *bytes.Reader
 	err    error