[
https://issues.apache.org/jira/browse/HIVE-625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12729677#action_12729677
]
Namit Jain commented on HIVE-625:
---------------------------------
But, is it a good idea to always do so ?
Can't you come up with another testcase where the opposite will hold.
The reducer has a highly selective filter at the beginning, followed by a
select.
In binarysortableserde, all the columns are read, whereas in lazysimleserde,
most of the columns are not even materialized.
> Use of BinarySortableSerDe for serialization of the value between map and
> reduce boundary
> -----------------------------------------------------------------------------------------
>
> Key: HIVE-625
> URL: https://issues.apache.org/jira/browse/HIVE-625
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Attachments: HIVE-625.1.patch
>
>
> We currently use LazySimpleSerDe which serializes double to text format.
> Before we have LazyBinarySerDe, we should switch to BinarySortableSerDe
> because that's still much faster than LazySimpleSerDe.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
