Hi, I might have a stupid question about sparksql's implementation of join on not equality conditions, for instance condition1 or condition2.
In fact, Hive doesn't support such join, as it is very difficult to express such conditions as a map/reduce job. However, sparksql supports such operation. So I would like to know how spark implement it. As I observe such join runs very slow, I guess that spark implement it by doing filter on the top of cartesian product. Is it true? Thanks in advance for your help. Cheers Gen
