Add a "skew join map join size" variable to control the input size of skew
join's following map join job.
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Key: HIVE-1093
URL: https://issues.apache.org/jira/browse/HIVE-1093
Project: Hadoop Hive
Issue Type: Improvement
Reporter: He Yongqiang
In a test, many skew join key itself >250M size. And the following mapjoin will
take several hours to do a mapjoin for those big skew keys.
This can be better by using a small map input size for the following map join
job.
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