UNION表时如何重新排列/重新排序Bigquery中嵌套的重复列

Question

我有两个具有相似架构但顺序不同的 Bigquery 表

当使用下面的查询联合这两个表时，

select id, timestamp, products, count_total_visit, count_unique_session from table1
union all
select id, timestamp, products, count_total_visit, count_unique_session from table2

这是我得到的错误

UNION ALL 中的第 3 列具有不兼容的类型：ARRAY<STRUCT<name STRING, group STRING, ...>>, ARRAY<STRUCT<name STRING, group STRING, ...>> at [...]

如何通过嵌套重复字段重新排列模式的顺序，以便通过保持模式格式与源表相同来合并 2 个表？

Answer 1

下面会做的伎俩

select id, timestamp, products, count_total_visit, count_unique_session from table1
union all
select * replace (array( 
    select as struct * replace (array( 
        select as struct paiment_method, count_total_trx, sum_total_gbv, sum_total_revenue
          from product.details
        ) as details
      )
    from t.products product
  ) as products)
from table2 t