將嵌套的BigQuery數據導出到雲存儲

Question

我試圖通過API將bigquery數據導出到谷歌雲存儲桶。 我從這里改編了代碼片段https://cloud.google.com/bigquery/docs/exporting-data

Job job = table.extract(format, gcsUrl);
// Wait for the job to complete
try {
  Job completedJob = job.waitFor(WaitForOption.checkEvery(1, 
TimeUnit.SECONDS),
      WaitForOption.timeout(3, TimeUnit.MINUTES));
  if (completedJob != null && completedJob.getStatus().getError() == null) {
    // Job completed successfully
  } else {
    // Handle error case
       System.out.println(completedJob.getStatus().getError());
  }
} catch (InterruptedException | TimeoutException e) {
  // Handle interrupted wait

}

我已經用“JSON”交換格式，因為我的數據是嵌套的，無法導出到CSV和gcsUrl與“gs：//mybucket/export_*.json”。 但錯誤消息告訴我以下問題：

transfer not working  BigQueryError{reason=invalid, location=null, message=Operation cannot be performed on a nested schema. Field: totals}

有什么建議嗎？ JSON應該能夠處理嵌套格式......

Answer 1

引用destinationFormat選項 ，您應該為format變量設置"NEWLINE_DELIMITED_JSON" ，以便導出為JSON。