aggThrow

此函数可用于测试异常安全性。它会在创建时以指定概率抛出异常。

语法

aggThrow(throw_prob)

参数

• throw_prob — 在创建时抛出异常的概率。Float64。

返回值

• 异常：Code: 503. DB::Exception: Aggregate function aggThrow has thrown exception successfully。

示例

查询：

SELECT number % 2 AS even, aggThrow(number) FROM numbers(10) GROUP BY even;

结果：

Received exception:
Code: 503. DB::Exception: Aggregate function aggThrow has thrown exception successfully: While executing AggregatingTransform. (AGGREGATE_FUNCTION_THROW)