Use CombineHiveInputFormat for the merge job if hive.merge.mapredfiles=true
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Key: HIVE-1622
URL: https://issues.apache.org/jira/browse/HIVE-1622
Project: Hadoop Hive
Issue Type: Improvement
Reporter: Ning Zhang
Assignee: Ning Zhang
Currently map-only merge (using CombineHiveInputFormat) is only enabled for
merging files generated by mappers. It should be used for files generated at
readers as well.
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