[
https://issues.apache.org/jira/browse/SPARK-11077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
ASF GitHub Bot updated SPARK-11077:
-----------------------------------
Labels: pull-request-available (was: )
> 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
> Priority: Major
> Labels: pull-request-available
>
> 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
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
