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https://issues.apache.org/jira/browse/SPARK-9843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15047721#comment-15047721
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Apache Spark commented on SPARK-9843:
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User 'robert3005' has created a pull request for this issue:
https://github.com/apache/spark/pull/10210
> Catalyst: Allow adding custom optimizers
> ----------------------------------------
>
> Key: SPARK-9843
> URL: https://issues.apache.org/jira/browse/SPARK-9843
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 1.4.1
> Reporter: Robert Kruszewski
>
> Currently there's only option to plug into query planning. This provides
> limited capability for optimizing queries.
> Allowing specifying custom optimizers would allow applications that make use
> of spark sql tune their workflows. One example would be inserting
> repartitions into query plan which isn't generally applicable but if you know
> range of possible queries you can do that on the backend.
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