[
https://issues.apache.org/jira/browse/HIVE-15682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15863356#comment-15863356
]
Dapeng Sun commented on HIVE-15682:
-----------------------------------
Hi Xuefu, sorry, I didn't receive the email notification of this JIRA.
Do you mean you want to test {{order by}} likes {{`select count(*) from (select
request_lat from dwh.fact_trip where datestr > '2017-01-27' order by
request_lat) x;`}} about {{ w/ HIVE-15580 }}, {{ w/o HIVE-15580 }} at my
environment?
> Eliminate per-row based dummy iterator creation
> -----------------------------------------------
>
> Key: HIVE-15682
> URL: https://issues.apache.org/jira/browse/HIVE-15682
> Project: Hive
> Issue Type: Improvement
> Components: Spark
> Affects Versions: 2.2.0
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
> Fix For: 2.2.0
>
> Attachments: HIVE-15682.patch
>
>
> HIVE-15580 introduced a dummy iterator per input row which can be eliminated.
> This is because {{SparkReduceRecordHandler}} is able to handle single key
> value pairs. We can refactor this part of code 1. to remove the need for a
> iterator and 2. to optimize the code path for per (key, value) based (instead
> of (key, value iterator)) processing. It would be also great if we can
> measure the performance after the optimizations and compare to performance
> prior to HIVE-15580.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
