If the database designer has created a Primary partition Index on a table, queries should incorporate the partitioning column.
如果数据库设计者已在表上创建了主分区索引，那么查询应当与分区列结合。
A partitioning key is a column (or group of columns) that is used to determine the partition in which a particular row of data is stored.
分区键是用于确定特定一行数据存储在哪个分区的一个列(或一组列)。
If the RANDOM column is used to determine the partition location of a table row.
如果random列用于确定一个表行的分区位置。
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