将嵌套的 BigQuery 数据导出到云存储

问题描述

我正在尝试通过 API 将 bigquery 数据导出到谷歌云存储桶.我从这里改编了一个代码片段https://cloud.google.com/bigquery/docs/exporting-data

I am trying to export bigquery data to google cloud storage bucket via the API. I adapted a code snippet from herehttps://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

}

我已经用JSON"交换了格式，因为我的数据是嵌套的，不能用gs://mybucket/export_*.json"导出到 CSV 和 gcsUrl.但是错误消息告诉我以下问题:

I have exchanged format with "JSON" since my data is nested and can't be exported to CSV and the gcsUrl with "gs://mybucket/export_*.json". But the error messages tells me the following problem:

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

有什么建议吗?JSON 应该能够处理嵌套格式...

Any advice what to do? JSON should be able to handle a nested format...

推荐答案

参考destinationFormat 选项，您应该为 format 变量设置 "NEWLINE_DELIMITED_JSON" 以便导出为 JSON.

Referring to the destinationFormat option, you should set "NEWLINE_DELIMITED_JSON" for the format variable in order to export as JSON.

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