function loadFileToBigQuery($uri_array, $schema_array, $dataset, $table_name)
{
$loadConfig = new Google_Service_Bigquery_JobConfigurationLoad();
$loadConfig->setSchema($this->createSchema($schema_array));
$loadConfig->setSourceUris($uri_array);
$loadConfig->setDestinationTable($this->createDestinationTable($dataset, $table_name));
$loadConfig->setCreateDisposition("CREATE_IF_NEEDED");
$loadConfig->setWriteDisposition("WRITE_APPEND");
$loadConfig->sourceFormat = 'CSV';
$config = new Google_Service_Bigquery_JobConfiguration();
$config->setDryRun(false);
$config->setLoad($loadConfig);
$job = new Google_Service_Bigquery_Job();
$job->setConfiguration($config);
// this may throw exception: Google_Service_Exception
$job = $this->service->jobs->insert($this->project_id, $job);
return $job;
}