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From "Zhenhua Wang (JIRA)" <>
Subject [jira] [Commented] (SPARK-16026) Cost-based Optimizer framework
Date Thu, 01 Dec 2016 13:49:58 GMT


Zhenhua Wang commented on SPARK-16026:

[~rxin] Yes, I'll spend more time on CBO from this saturday.

> Cost-based Optimizer framework
> ------------------------------
>                 Key: SPARK-16026
>                 URL:
>             Project: Spark
>          Issue Type: New Feature
>          Components: SQL
>            Reporter: Reynold Xin
>              Labels: releasenotes
>         Attachments: Spark_CBO_Design_Spec.pdf
> 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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