Question

修改了 allowLargeResults ，我也尝试了交互式和批量查询优先级。表 search_results 中有70M记录，搜索中有10M记录，购买表中约有（仅）900记录。并且WHERE也很好地减少了行数。

SELECT
    s.flyFrom, s.to, s.typeFlight, r.price, b.price, b.affily
FROM [sptest.buy] AS b
INNER JOIN [sptest.search_results] AS r
ON b.booking_token=r.booking_token
INNER JOIN [sptest.searches] AS s
ON s.searchid=r.searchid
WHERE
    DATE(r.saved_at) >= DATE('2015-06-23 00:00:00') AND 
    DATE(s.saved_at) >= DATE('2015-06-23 00:00:00')
LIMIT 10

问题可能是由大型连接键引起的吗？ booking_token 键是可变大小的50-600个字符。

Answer 1

我会对此查询进行一些修改：

将WHERE子句过滤器移近表扫描
使用JOIN EACH构造

SELECT s.flyFrom, s.to, s.typeFlight, r.price, b.price, b.affily FROM [sptest.buy] AS b INNER JOIN EACH (SELECT * FROM [sptest.search_results] WHERE saved_at > DATE('2015-06-23 00:00:00')) AS r ON b.booking_token=r.booking_token INNER JOIN EACH (SELECT * FROM [sptest.searches] WHERE saved_at > DATE('2015-06-23 00:00:00') AS s ON s.searchid=r.searchid LIMIT 10

Google Bigquery通过简单的选择说“响应太大而无法返回”

1 个答案: