fix(Picker): setColumnValues failed in cascade mode (#6080)

src/picker/index.js

@@ -1,5 +1,5 @@
 // Utils
-import { createNamespace } from '../utils';
+import { createNamespace, isObject } from '../utils';
 import { preventDefault } from '../utils/dom/event';
 import { BORDER_TOP_BOTTOM, BORDER_UNSET_TOP_BOTTOM } from '../utils/constant';
 import { pickerProps } from './shared';
@@ -111,14 +111,9 @@ export default createComponent({
         cursor = cursor.children[indexes[i]];
       }
 
-      while (cursor.children) {
+      while (cursor && cursor.children) {
         columnIndex++;
-
-        this.setColumnValues(
-          columnIndex,
-          cursor.children.map((item) => item[this.valueKey])
-        );
-
+        this.setColumnValues(columnIndex, cursor.children);
         cursor = cursor.children[cursor.defaultIndex || 0];
       }
     },
@@ -198,7 +193,14 @@ export default createComponent({
       const column = this.children[index];
 
       if (column) {
-        column.setOptions(options);
+        if (this.dataType === 'cascade') {
+          // map should be removed in next major version
+          column.setOptions(
+            options.map((item) => (isObject(item) ? item[this.valueKey] : item))
+          );
+        } else {
+          column.setOptions(options);
+        }
       }
     },