hive的分桶抽样查询

Hive的分桶抽样查询是通过对分桶字段的值进行哈希运算，然后除以桶的个数求余的方式决定该条记录存放在哪个桶当中，从而实现对分桶数据的抽样查询。要进行分桶抽样查询，可以使用以下语句：select * from tablename tablesample(bucket x out of y);其中x表示选择的桶数，y表示总共的桶数。在进行分桶抽样查询之前，需要设置hive.enforce.bucketing=true，以确保分桶功能生效。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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