recreate key and value when switching files in CombineHiveInputFormat
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Key: HIVE-2603
URL: https://issues.apache.org/jira/browse/HIVE-2603
Project: Hive
Issue Type: Bug
Reporter: He Yongqiang
Assignee: He Yongqiang
different files in the same mappers may have different types of key and value.
So need to create the key and value object when switching files.
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