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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