Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14132
Hmm, maybe more sophisticate method is needed for both the following cases.
* SELECT /*+ MAPJOIN(t1) */ * FROM (SELECT * FROM t1) x JOIN t1
* SELECT /*+ MAPJOIN(t1) */ * FROM (SELECT * FROM t1) x JOIN t2;
By the way, Hive 1.1 and 1.0 shows the same result to me.
For the general cases, DFS will be used. And only the logic for self join
cases will be changed.
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