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https://issues.apache.org/jira/browse/HIVE-5775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14041056#comment-14041056
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Xuefu Zhang commented on HIVE-5775:
-----------------------------------
Thanks for the clarification, [~gopalv]. We are in total agreement if what is
put in the logical layer is the optimization that's applicable to either
execution engine and if execution engine specific optimization is put in the
execution layer. Maybe the document can be updated to make this explicit to
avoid confusion/misunderstanding from others.
{quote}
The cost model as described in the doc assumes TEZ as the execution layer.
{quote}
Not sure if I understand [~jpullokkaran] correctly. If the cost model is based
on Tez, then we shall only use a model that's common for both Tez and MR when
rewriting the query, right?
> 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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