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https://issues.apache.org/jira/browse/SPARK-11077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust updated SPARK-11077:
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Target Version/s: (was: 1.6.0)
> Join elimination in Catalyst
> ----------------------------
>
> Key: SPARK-11077
> URL: https://issues.apache.org/jira/browse/SPARK-11077
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Ankur Dave
> Assignee: Ankur Dave
>
> Join elimination is a query optimization where certain joins can be
> eliminated when followed by projections that only keep columns from one side
> of the join, and when certain columns are known to be unique or foreign keys.
> This can be very useful for queries involving views and machine-generated
> queries.
> Adding join elimination to Catalyst requires (1) support for unique and
> foreign key hints in logical plans, (2) methods in the DataFrame API to let
> users provide these hints, and (3) an optimizer rule that eliminates unique
> key outer joins and referential integrity joins when followed by an
> appropriate projection.
> This proposal is described in detail here:
> https://docs.google.com/document/d/1-YgQSQywHfAo4PhAT-zOOkFZtVcju99h3dYQq-i9GWQ/edit?usp=sharing
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