check error when parse field failed

pkg/kubectl/BUILD

@@ -62,6 +62,7 @@ go_test(
         "//vendor/k8s.io/api/scheduling/v1alpha1:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/api/equality:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/api/errors:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/api/meta:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/api/resource:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1/unstructured:go_default_library",

pkg/kubectl/sorter.go

@@ -277,13 +277,16 @@ func (r *RuntimeSort) Less(i, j int) bool {
 	iObj := r.objs[i]
 	jObj := r.objs[j]
 
-	parser := jsonpath.New("sorting").AllowMissingKeys(true)
-	parser.Parse(r.field)
-
 	var iValues [][]reflect.Value
 	var jValues [][]reflect.Value
 	var err error
 
+	parser := jsonpath.New("sorting").AllowMissingKeys(true)
+	err = parser.Parse(r.field)
+	if err != nil {
+		panic(err)
+	}
+
 	if unstructured, ok := iObj.(*unstructured.Unstructured); ok {
 		iValues, err = parser.FindResults(unstructured.Object)
 	} else {

pkg/kubectl/sorter_test.go

@@ -22,6 +22,7 @@ import (
 	"testing"
 
 	api "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/meta"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -408,3 +409,67 @@ func TestSortingPrinter(t *testing.T) {
 		}
 	}
 }
+
+func TestRuntimeSortLess(t *testing.T) {
+	var testobj runtime.Object
+
+	testobj = &api.PodList{
+		Items: []api.Pod{
+			{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "b",
+				},
+			},
+			{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "c",
+				},
+			},
+			{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "a",
+				},
+			},
+		},
+	}
+
+	testobjs, err := meta.ExtractList(testobj)
+	if err != nil {
+		t.Fatalf("ExtractList testobj got unexpected error: %v", err)
+	}
+
+	testfield := "{.metadata.name}"
+	testruntimeSort := NewRuntimeSort(testfield, testobjs)
+	tests := []struct {
+		name         string
+		runtimeSort  *RuntimeSort
+		i            int
+		j            int
+		expectResult bool
+		expectErr    bool
+	}{
+		{
+			name:         "test less true",
+			runtimeSort:  testruntimeSort,
+			i:            0,
+			j:            1,
+			expectResult: true,
+		},
+		{
+			name:         "test less false",
+			runtimeSort:  testruntimeSort,
+			i:            1,
+			j:            2,
+			expectResult: false,
+		},
+	}
+
+	for i, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			result := test.runtimeSort.Less(test.i, test.j)
+			if result != test.expectResult {
+				t.Errorf("case[%d]:%s Expected result: %v, Got result: %v", i, test.name, test.expectResult, result)
+			}
+		})
+	}
+}