Encode MapReduce Shuffling Keys Differently for Single string/bigint Key
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Key: HIVE-1802
URL: https://issues.apache.org/jira/browse/HIVE-1802
Project: Hive
Issue Type: Improvement
Reporter: Siying Dong
Assignee: Siying Dong
Delimiters are not needed if we only have one shuffling key, and in the same
time escaping delimiters are not needed. We can save some CPU time on
serializing and shuffle slightly less amount of data to save memory footprint
and network traffic.
Also there is a bug that for group-by, we by mistake add a -1 to the end of the
key and pay one more unnecessary mem-copy. Can be easily fixed.
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