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Posted to issues@hive.apache.org by "Nishant Bangarwa (JIRA)" <ji...@apache.org> on 2018/08/06 17:03:00 UTC

[jira] [Updated] (HIVE-20278) Druid Scan Query avoid copying from List -> Map -> List

     [ https://issues.apache.org/jira/browse/HIVE-20278?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nishant Bangarwa updated HIVE-20278:
------------------------------------
    Attachment: HIVE-20278.patch

> Druid Scan Query avoid copying from List -> Map -> List
> -------------------------------------------------------
>
>                 Key: HIVE-20278
>                 URL: https://issues.apache.org/jira/browse/HIVE-20278
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Nishant Bangarwa
>            Assignee: Nishant Bangarwa
>            Priority: Major
>              Labels: PERFORMANCE
>         Attachments: HIVE-20278.patch
>
>
> DruidScanQueryRecordReader gets a compacted List<Object> from druid. It then converts that list into a Map<String,Object> as DruidWritable where key is the column name. 
> At the second stage DruidSerde takes this DruidWritable and creates a List out out of the map again. We can avoid the map creation part by reading the list sent by druid directly in the DruidSerde.deserialize() method.



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