Here, the entire query is executed by the Oracle server, so you only see a RETURN operator without any SHIP operator.
在这里，整个查询都由Oracle服务器执行，所以只能看到一个return操作符，而看不到任何ship操作符。
The UNION operator consumes the data a row at a time from the SHIP buffer and flows the row upwards to the application through the RETURN operator.
UNION操作符每次使用SHIP缓冲区中的一行数据，并将这行数据通过RETURN 操作符上传到应用程序。
The UNION operator consumes the data a row at a time from the SHIP buffer and flows the row upwards to the application through the RETURN operator.
UNION操作符每次使用SHIP缓冲区中的一行数据，并将这行数据通过RETURN 操作符上传到应用程序。
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