a mapper should be able to span multiple partitions
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Key: HIVE-1900
URL: https://issues.apache.org/jira/browse/HIVE-1900
Project: Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Namit Jain
Assignee: He Yongqiang
Currently, a mapper only spans a single partition which creates a problem in
the presence of many
small partitions (which is becoming a common usecase in facebook).
If the plan is the same, a mapper should be able to span files across multiple
partitions
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