Hive 之 map join 和 left semi join 区别

上一篇hive 常见join 从原理上讲解了他们的区别，这篇文章通过例子来区别。   0 Data Prepare create table test.student as select 1 as id, 'jack' as name union all select 2 as id, 'jack' as name union all select 3 as id, 'jerry' as name

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