[jira] Updated: (HIVE-1802) Encode MapReduce Shuffling Keys Differently for Single string/bigint Key

["Siying Dong (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-1802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Siying Dong updated HIVE-1802:
------------------------------

    Attachment: HIVE-1802.1.patch

1. Two another SerDe only for encoding single string and single bigint, respectively.
2. When generating reduce plan, identify single sting and bigint case and write the serde in the plan
3. add a test for key as bigint as keys
4. fix the bug of adding FF to the end of group-by keys and pay one more mem-copy.


> 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
>
>
> 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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