wangmeng created HIVE-7469:
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Summary: skew join keys when two join table have the same big
skew key
Key: HIVE-7469
URL: https://issues.apache.org/jira/browse/HIVE-7469
Project: Hive
Issue Type: Improvement
Reporter: wangmeng
In https://issues.apache.org/jira/browse/HIVE-964, I have an general idea
about how to deal with skew join key ,but there has a case which troubles me:
if the two join tables have the same big skew key on one value :
for example , select * from table A join B on A.id=b.id, both table A and
B have a lot of keys on id=1, in this case , if we use map join to deal
with the skew key id=1 ,maybe it will OOM.
so ,how to fix this case? Will it rollback to common join ? Thanks.
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