只有在执行大块操作或是在多个原子单元间进行数据查询时才建议关闭过滤。
When Filtering is suggested to be turned off only when performing bulk operations or when querying data over many atomic units.
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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