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https://issues.apache.org/jira/browse/HIVE-5775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14039987#comment-14039987
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Xuefu Zhang commented on HIVE-5775:
-----------------------------------
Thanks to all for working on this. I'm not sure if this has ever surfaced, but
I'm wondering if this cost based optimization is specific to Tez. From the
design doc it seems that this new optimizer was plugged in the logical layer,
while certain cost estimations are based on Tez such as vertex. Obviously the
cost for a given query would be different for MapReduce vs Tez, but cost based
optimization is equally valuable to both MR and Tez. However, applying an
optimization based on one execution engine may cause adverse result when the
configured engine is of another type. Therefore, I'd like know if any thoughts
has been given and what's plan to address this.
> Introduce Cost Based Optimizer to Hive
> --------------------------------------
>
> Key: HIVE-5775
> URL: https://issues.apache.org/jira/browse/HIVE-5775
> Project: Hive
> Issue Type: New Feature
> Reporter: Laljo John Pullokkaran
> Assignee: Laljo John Pullokkaran
> Attachments: CBO-2.pdf, HIVE-5775.1.patch
>
>
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