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hive> desc t1;   
OK
id                      int                                         
name                    string                                      
p_id                    int                                         
Time taken: 0.118 seconds, Fetched: 3 row(s)
hive> desc t2;
OK
id                      int                                         
name                    string                                      
Time taken: 0.051 seconds, Fetched: 2 row(s)
hive> select * from t1;
OK
1       aaa     2
2       bbb     2
3       ccc     3
4       ddd     4
5       fff     3
6       ooo     23
Time taken: 0.418 seconds, Fetched: 6 row(s)
hive> select * from t2;
OK
4       jjj
4       jjj
4       jjj
2       abc
3       hhh
4       jjj
3       ii
2       fuck
7       shit
Time taken: 0.068 seconds, Fetched: 9 row(s)
hive> select * from t1 left outer join t2 on (t1.p_id=t2.id) where t2.name='abc';

OK
1       aaa     2       2       abc
2       bbb     2       2       abc
Time taken: 21.53 seconds, Fetched: 2 row(s)
hive> select * from t1 left outer join t2 on (t1.p_id=t2.id and t2.name='abc');   

OK
1       aaa     2       2       abc
2       bbb     2       2       abc
3       ccc     3       NULL    NULL
4       ddd     4       NULL    NULL
5       fff     3       NULL    NULL
6       ooo     23      NULL    NULL
Time taken: 17.676 seconds, Fetched: 6 row(s)

hive left outer join 要过滤右表的数据应该是第二种写法，第一种是mysql的写法，但是在hive中会存在问题。