Google BigQuery是否支持ARRAY <string>?

时间:2017-06-03 06:53:51

标签: google-bigquery google-cloud-platform google-cloud-dataflow

我正在将Google数据流中的数据推送到Google BigQuery。我有TableRow对象,其中包含数据。 TableRow中的一列确实包含String of String。

here开始,我发现Google BigQuery支持Array列类型。 所以我尝试创建ARRAY<SCHEMA>类型的表。但我得到了以下错误

com.google.api.client.googleapis.json.GoogleJsonResponseException: 400 Bad Request
{
  "code" : 400,
  "errors" : [ {
    "domain" : "global",
    "message" : "Invalid value for: ARRAY<STRING> is not a valid value",
    "reason" : "invalid"
  } ],
  "message" : "Invalid value for: ARRAY<STRING> is not a valid value"
}
com.google.cloud.dataflow.sdk.util.UserCodeException.wrapIf(UserCodeException.java:47)
com.google.cloud.dataflow.sdk.util.DoFnRunnerBase.wrapUserCodeException(DoFnRunnerBase.java:369)
com.google.cloud.dataflow.sdk.util.DoFnRunnerBase.finishBundle(DoFnRunnerBase.java:162)
com.google.cloud.dataflow.sdk.runners.worker.SimpleParDoFn.finishBundle(SimpleParDoFn.java:194)
com.google.cloud.dataflow.sdk.runners.worker.ForwardingParDoFn.finishBundle(ForwardingParDoFn.java:47)

以下是我用于将值发布到BigQuery

的代码
    .apply(BigQueryIO.Write.named("Write enriched data")
               .withCreateDisposition(BigQueryIO.Write.CreateDisposition.CREATE_IF_NEEDED)
               .withSchema(getSchema())
               .withWriteDisposition(BigQueryIO.Write.WriteDisposition.WRITE_APPEND)
               .to("table_name"));

这是架构构造

private static TableSchema getSchema() {
    List<TableFieldSchema> fields = new ArrayList<>();

    fields.add(new TableFieldSchema().setName("column1").setType("STRING"));
    fields.add(new TableFieldSchema().setName("column2").setType("STRING"));
    fields.add(new TableFieldSchema().setName("array_column").setType("ARRAY<STRING>"));

    return new TableSchema().setFields(fields);
}

如何在BigQuery表中插入字符串数组?

1 个答案:

答案 0 :(得分:5)

要在BigQuery中定义ARRAY<STRING>,我将字段设置为&#39; STRING&#39;及其模式为&#39; REPEATED&#39;。

例如,在Python中,它被定义为field = SchemaField(name='field_1', type='STRING', mode='REPEATED')

对于我可以看到您有相同选项的Java客户端,您可以将TYPE定义为STRING,将MODE定义为REPEATED