基于xml谓词过滤数据。
如果是在一个表中,那么您必须执行一次投影操作来过滤数据。
In the case of a table, you must do a projection operation to cull the data.
步骤3:在执行加载和卸载操作时,HPL还允许操作和过滤数据。
Step 3: the HPL also allows you to manipulate and filter the data as load and unload operations are performed.
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