如果查询中使用星型连接指令，指令会将会话环境设置覆盖。
If star join directives are used in a query, directives override session environment setting.
如果连接指令到达之时队列已满，连接将被拒绝。
If a connection indication arrives when the queue is full, the connection is refused.
呼入连接指令(连接请求)的最大队列长度为50。
The maximum queue length for incoming connection indications (a request to connect) is set to 50.
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