Fixed empty merge problem - need to visit empty arrays and objects

cmd/commands_test.go

@@ -575,6 +575,28 @@ func TestReadEmptyContentCmd(t *testing.T) {
 	test.AssertResult(t, expectedOutput, result.Output)
 }
 
+func TestReadEmptyNodesPrintPathCmd(t *testing.T) {
+	content := `map: 
+  that: {}
+array: 
+  great: []
+null:
+  indeed: ~`
+	filename := test.WriteTempYamlFile(content)
+	defer test.RemoveTempYamlFile(filename)
+
+	cmd := getRootCommand()
+	result := test.RunCmd(cmd, fmt.Sprintf("read %s -ppv **", filename))
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	expectedOutput := `map.that: {}
+array.great: []
+null.indeed: ~
+`
+	test.AssertResult(t, expectedOutput, result.Output)
+}
+
 func TestReadEmptyContentWithDefaultValueCmd(t *testing.T) {
 	content := ``
 	filename := test.WriteTempYamlFile(content)

pkg/yqlib/data_navigator.go

@@ -84,6 +84,8 @@ func (n *navigator) recurse(value *yaml.Node, head interface{}, tail []interface
 
 			if head == "+" {
 				return n.appendArray(value, head, tail, pathStack)
+			} else if len(value.Content) == 0 && head == "**" {
+				return n.navigationStrategy.Visit(NewNodeContext(value, head, tail, pathStack))
 			}
 			return n.splatArray(value, head, tail, pathStack)
 		}
@@ -126,7 +128,9 @@ func (n *navigator) recurseMap(value *yaml.Node, head string, tail []interface{}
 		return errorVisiting
 	}
 
-	if traversedEntry || n.navigationStrategy.GetPathParser().IsPathExpression(head) || !n.navigationStrategy.AutoCreateMap(NewNodeContext(value, head, tail, pathStack)) {
+	if len(value.Content) == 0 && head == "**" {
+		return n.navigationStrategy.Visit(NewNodeContext(value, head, tail, pathStack))
+	} else if traversedEntry || n.navigationStrategy.GetPathParser().IsPathExpression(head) || !n.navigationStrategy.AutoCreateMap(NewNodeContext(value, head, tail, pathStack)) {
 		return nil
 	}