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Posted to dev@hive.apache.org by "Nishant Bangarwa (JIRA)" <ji...@apache.org> on 2018/07/31 11:54:00 UTC

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

Nishant Bangarwa created HIVE-20278:
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             Summary: 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


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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