Question

我正在运行类似于此的查询：

SELECT date, group, COUNT(a.user_id) as count
FROM (
SELECT user_id, DATE(timestamp) as date
FROM [db.log_2015_08]
GROUP EACH BY user_id, date) as a
JOIN EACH (
SELECT user_id, group
FROM [db.users]) as b
ON a.user_id = b.user_id
GROUP BY date, group

收到以下错误：

Error: Shuffle reached broadcast limit for table __I0 (broadcasted at least 137619698 bytes). Consider using partitioned joins instead of broadcast joins .

我一直在使用BigQuery，这对我来说是一个新的！这是一个非常大的联接，但我觉得我之前没有这个错误做过类似的事情。

Answer 1

尝试将<?xml version="1.0" encoding="utf-8" ?> <configuration> <configSection> <section name="hibernate-configuration" type="NHibernate.cfg.ConfigurationSectionHandler, NHibernate "></section> </configSection> <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2"> <session-factory> <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property> <property name="dialect">NHibernate.Dialect.MsSql2008Dialect</property> <property name="connection.driver_class">NHibernate.Driver.SqlServerCeDriver</property> <property name="connection.connection_string">Data Source=(local);Initial Catalog=Learning;Integrated Security=True</property> <property name="show_sql">true</property> <mapping assembly="NHibernateBasics.Mapping"></mapping> </session-factory> </hibernate-configuration> </configuration>更改为GROUP EACH BY。聚合不再需要GROUP BY关键字，事实上，如果删除它，查询规划器可以更聪明一些。

BigQuery加入广播限制错误

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