You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@spark.apache.org by "Stephan Kessler (JIRA)" <ji...@apache.org> on 2016/01/04 09:42:39 UTC
[jira] [Commented] (SPARK-12449) Pushing down arbitrary logical
plans to data sources
[ https://issues.apache.org/jira/browse/SPARK-12449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15080835#comment-15080835 ]
Stephan Kessler commented on SPARK-12449:
-----------------------------------------
Hi Reynold,
i fully agree that we need the flexibility for the logical plan. What about marking this API as DeveloperAPI or even Experimental? In this case, each datasource implementing those interfaces will safely work with a specific Spark Version, and might need modifications for a new one (which might be the case anyways).
What do you think?
Best,
Stephan
> Pushing down arbitrary logical plans to data sources
> ----------------------------------------------------
>
> Key: SPARK-12449
> URL: https://issues.apache.org/jira/browse/SPARK-12449
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Stephan Kessler
> Attachments: pushingDownLogicalPlans.pdf
>
>
> With the help of the DataSource API we can pull data from external sources for processing. Implementing interfaces such as {{PrunedFilteredScan}} allows to push down filters and projects pruning unnecessary fields and rows directly in the data source.
> However, data sources such as SQL Engines are capable of doing even more preprocessing, e.g., evaluating aggregates. This is beneficial because it would reduce the amount of data transferred from the source to Spark. The existing interfaces do not allow such kind of processing in the source.
> We would propose to add a new interface {{CatalystSource}} that allows to defer the processing of arbitrary logical plans to the data source. We have already shown the details at the Spark Summit 2015 Europe [https://spark-summit.org/eu-2015/events/the-pushdown-of-everything/]
> I will add a design document explaining details.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org