Google play services 谷歌驱动Android API'；queryChildren'；vs.过滤器

我想知道使用以下过滤器构造是否有区别：

  GoogleApiClient GAC;
  ...
  ArrayList<Filter> fltrs = new ArrayList<Filter>();
  fltrs.add(Filters.in(SearchableField.PARENTS, (DriveId)id));
  ...
  Query qry = new Query.Builder().addFilter(Filters.and(fltrs)).build();
  MetadataBufferResult rslt = Drive.DriveApi.query(GAC, query).await();

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“queryChildren”似乎是多余的。

不，它们在功能上是等价的

  DriveFolder dFld = Drive.DriveApi.getFolder(GAC, (DriveId)id)
  dFld.queryChildren(GAC, qry).await():