Google analytics 匹配谷歌分析增加了GA和BigQuery之间的联系

我正试图从我在BigQuery中导出的谷歌分析数据中获得产品添加到购物篮的数量

当我在GA界面中查看特定页面时，我看到1669产品添加到了篮子中

select date,
SUM(adds) as total_adds
from
(SELECT
    date,
    CONCAT(fullvisitorid, CAST(visitid AS string)) AS session_id,
    hits_product.productlistname as product_list,
    hits_product.productsku as sku,
    CASE WHEN hits.eCommerceAction.action_type = '3' THEN 1 ELSE 0 END AS adds
    FROM
    `project.dataset.ga_sessions_20191208` AS t,
    UNNEST(hits) AS hits,
    UNNEST(hits.product) AS hits_product
  WHERE hits_product.productlistname = 'my_page_url'
  and hits.eCommerceAction.action_type = '3'
)
    group by 1

然而，当我尝试用下面的查询在原始数据上复制它时，我得到了1322个添加到篮子中

select date,
SUM(adds) as total_adds
from
(SELECT
    date,
    CONCAT(fullvisitorid, CAST(visitid AS string)) AS session_id,
    hits_product.productlistname as product_list,
    hits_product.productsku as sku,
    CASE WHEN hits.eCommerceAction.action_type = '3' THEN 1 ELSE 0 END AS adds
    FROM
    `project.dataset.ga_sessions_20191208` AS t,
    UNNEST(hits) AS hits,
    UNNEST(hits.product) AS hits_product
  WHERE hits_product.productlistname = 'my_page_url'
  and hits.eCommerceAction.action_type = '3'
)
    group by 1

当我对产品视图运行类似的查询时，数字是匹配的，那么为什么我会看到产品添加到篮子中的差异呢

如果我忽略了页面（从上面的查询中删除

WHERE hits\u product.productlistname='my\u page\u url'

），并运行了一整天的数字，我会得到一个完美的匹配

我也试过运行GA的未取样数字，但我仍然看到了不同