进行分页时大查询选择期间架构实例为空

Question

我正在使用分页并参考此链接

https://cloud.google.com/bigquery/docs/paging-results#java

我的示例代码如下所示

    public void readAggBatchBq() throws InterruptedException {
        BigQuery bq = bqConfig.bigQuery();

        TableId tableId = TableId.of(dataset, table);
        String query = "SELECT * from `test.historical_data`";
        QueryJobConfiguration queryConfig =
                QueryJobConfiguration.newBuilder(query)
                        // save results into a table.
                        //.setDestinationTable(tableId)
                        //.setWriteDisposition(JobInfo.WriteDisposition.WRITE_APPEND)

                        .build();

        bq.query(queryConfig);

        TableResult results =
                bq.listTableData(tableId, BigQuery.TableDataListOption.pageSize(4));

        // First Page
        while(results.hasNextPage()) {
            Schema sch = results.getSchema();
            results
                    .getValues()
                    .forEach(row -> row.forEach(val -> System.out.printf("%s,\n", val.toString())));
            results = results.getNextPage();
        }
        results = results.getNextPage();
        System.out.println("Query pagination performed successfully.");
    

当我从结果中读取架构时，架构为空。有什么问题吗？

Answer 1

可能在

tableId

标识的表中没有数据。 尝试取消注释

//.setDestinationTable(tableId)