plancodec: fix a miss case in conversion (#35957)

close pingcap/tidb#35956

util/plancodec/id.go

@@ -394,6 +394,8 @@ func PhysicalIDToTypeString(id int) string {
 		return TypeBatchPointGet
 	case typeClusterMemTableReader:
 		return TypeClusterMemTableReader
+	case typeDataSourceID:
+		return TypeDataSource
 	case typeLoadDataID:
 		return TypeLoadData
 	case typeTableSampleID:

util/plancodec/id_test.go

@@ -87,3 +87,9 @@ func TestPlanIDChanged(t *testing.T) {
 		require.Equal(t, testcase.Expected, testcase.Value)
 	}
 }
+
+func TestReverse(t *testing.T) {
+	for i := 1; i <= 55; i++ {
+		require.Equal(t, TypeStringToPhysicalID(PhysicalIDToTypeString(i)), i)
+	}
+}