queryMetadata method
      
Future<Operation> 
queryMetadata(
    
- QueryMetadataRequest request,
- String service, {
- String? $fields,
Query DPMS metadata.
request - The metadata request object.
Request parameters:
service - Required. The relative resource name of the metastore service
to query metadata, in the following
format:projects/{project_id}/locations/{location_id}/services/{service_id}.
Value must have pattern
^projects/\[^/\]+/locations/\[^/\]+/services/\[^/\]+$.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a Operation.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<Operation> queryMetadata(
  QueryMetadataRequest request,
  core.String service, {
  core.String? $fields,
}) async {
  final body_ = convert.json.encode(request);
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ = 'v1/' + core.Uri.encodeFull('$service') + ':queryMetadata';
  final response_ = await _requester.request(
    url_,
    'POST',
    body: body_,
    queryParams: queryParams_,
  );
  return Operation.fromJson(response_ as core.Map<core.String, core.dynamic>);
}