当用户调用服务器上的托管存储过程或函数时，或者当用户操作激发托管代码触发器时，此查询还会提供调用方的上下文。
This also provides the caller's context when a user calls a managed stored procedure or function on the server, or when a user's action fires a managed code trigger.
这个执行上下文参数的方向应设置为IN_OUT，因为它携带的信息在调用方组件和规则服务之间来回传送。
The direction of this execution context parameter should be set as IN_OUT, since the information it carries goes back and forth between the calling component and the rule service.
获取调用方活动的上下文id。
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