Question

我在查询hits.product.customDimensions时遇到问题（hits.customDimensions上的逻辑相同）。我无法理解为什么额外的嵌套会导致数组错误。任何帮助赞赏。谢谢！

标准SQL

SELECT
  fullVisitorId,
  visitId,
  hits.hitNumber,
  product.productSKU,
  MAX(IF(c.index=1,c.value, null)) AS customDimesion1
FROM 17823880.ga_sessions_20180128,
UNNEST(hits) AS hits, 
UNNEST(hits.product) as product,
UNNEST(hits.product.customDimensions) as c
GROUP BY 1, 2, 3, 4

错误：

无法对具有类型的值访问字段customDimensions ARRAY＆GT;在[11:23]

标准SQL - 此查询无效，

SELECT
  fullVisitorId,
  visitId,
  hits.hitNumber,
  MAX(IF(c.index=1,c.value, null)) AS customDimesion1
FROM 17823880.ga_sessions_20180128,
UNNEST(hits) AS hits,
UNNEST(hits.customDimensions) as c
GROUP BY 1, 2, 3

Answer 1

问题是您为来自product的元素提供了UNNEST(hits.product)的别名，但您未在后续UNNEST(hits.product.customDimensions)中引用该别名，因此在取消之后，你最终得到了原始的product数组而不是它的元素。试试这个：

SELECT
fullVisitorId,
visitId,
hits.hitNumber,
product.productSKU,
MAX(IF(c.index=1,c.value, null)) AS customDimesion1
FROM 17823880.ga_sessions_20180128,
UNNEST(hits) AS hits, 
UNNEST(hits.product) as product,
UNNEST(product.customDimensions) as c
GROUP BY 1, 2, 3, 4

Unnest hits.product.customDimensions错误

1 个答案: