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https://issues.apache.org/jira/browse/HIVE-1802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965021#action_12965021
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He Yongqiang commented on HIVE-1802:
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Yes. I am ok with the current approach.
(moving forward, we still need to figure out a better way which can be more
easy to maintain and extend. Like, we may want to try to separate serdes used
for group-by and join. If we do that in the current approach, we need to have 4
serdes for reduce-sink.)
> Encode MapReduce Shuffling Keys Differently for Single string/bigint Key
> -------------------------------------------------------------------------
>
> Key: HIVE-1802
> URL: https://issues.apache.org/jira/browse/HIVE-1802
> Project: Hive
> Issue Type: Improvement
> Reporter: Siying Dong
> Assignee: Siying Dong
> Attachments: HIVE-1802.1.patch, HIVE-1802.2.patch
>
>
> 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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