Web在阐述Hive Join具体的优化方法之前,首先看一下Hive Join的几个重要特点,在实际使用时也可以利用下列特点做相应优化: 1.只支持等值连接 2.底层会将写的HQL语句转换为MapReduce,并且reduce会将join语句中除最后一个表外都缓存起来 3.当三个或多个以上的表进行join操作时,如果每个on使用相同的字段 ... WebFeb 27, 2024 · A SELECT statement can be part of a union query or a subquery of another query.; table_reference indicates the input to the query. It can be a regular table, a view, …
Hive Join HiveQL Select Joins Query Types of Join in Hive
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How to Perform Joins in Apache Hive - DZone
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