[jira] [Commented] (SPARK-16026) Just

["Sean Owen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-16026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15422316#comment-15422316 ] 

Sean Owen commented on SPARK-16026:
-----------------------------------

[~ron8hu] you're opening lots of tasks and referring to 'design docs' but I see no discussion or info except these one liner JIRAs. Can you back up and share your ideas first on list? That should happen first.

> Just
> ----
>
>                 Key: SPARK-16026
>                 URL: https://issues.apache.org/jira/browse/SPARK-16026
>             Project: Spark
>          Issue Type: New Feature
>          Components: SQL
>            Reporter: Reynold Xin
>
> This is an umbrella ticket to implement a cost-based optimizer framework beyond broadcast join selection. This framework can be used to implement some useful optimizations such as join reordering.
> The design should discuss how to break the work down into multiple, smaller logical units. For example, changes to statistics class, system catalog, cost estimation/propagation in expressions, cost estimation/propagation in operators can be done in decoupled pull requests.



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