[
https://issues.apache.org/jira/browse/SPARK-7289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Apache Spark reassigned SPARK-7289:
-----------------------------------
Assignee: (was: Apache Spark)
> push down sort when it's child is Limit
> ---------------------------------------
>
> Key: SPARK-7289
> URL: https://issues.apache.org/jira/browse/SPARK-7289
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.3.1
> Reporter: Fei Wang
>
> Optimize following sql
> `select key from (select * from testData limit 5) t order by key limit 5`
> optimize it from
> ```
> == Parsed Logical Plan ==
> 'Limit 5
> 'Sort ['key ASC], true
> 'Project ['key]
> 'Subquery t
> 'Limit 5
> 'Project [*]
> 'UnresolvedRelation [testData], None
> == Analyzed Logical Plan ==
> Limit 5
> Sort [key#0 ASC], true
> Project [key#0]
> Subquery t
> Limit 5
> Project [key#0,value#1]
> Subquery testData
> LogicalRDD [key#0,value#1], MapPartitionsRDD[1]
> == Optimized Logical Plan ==
> Limit 5
> Sort [key#0 ASC], true
> Project [key#0]
> Limit 5
> LogicalRDD [key#0,value#1], MapPartitionsRDD[1]
> == Physical Plan ==
> TakeOrdered 5, [key#0 ASC]
> Project [key#0]
> Limit 5
> PhysicalRDD [key#0,value#1], MapPartitionsRDD[1]
> ```
> to
> ```
> == Parsed Logical Plan ==
> 'Limit 5
> 'Sort ['key ASC], true
> 'Project ['key]
> 'Subquery t
> 'Limit 5
> 'Project [*]
> 'UnresolvedRelation [testData], None
> == Analyzed Logical Plan ==
> Limit 5
> Sort [key#0 ASC], true
> Project [key#0]
> Subquery t
> Limit 5
> Project [key#0,value#1]
> Subquery testData
> LogicalRDD [key#0,value#1], MapPartitionsRDD[1]
> == Optimized Logical Plan ==
> Limit 5
> Sort [key#0 ASC], true
> Project [key#0]
> LogicalRDD [key#0,value#1], MapPartitionsRDD[1]
> == Physical Plan ==
> TakeOrdered 5, [key#0 ASC]
> Project [key#0]
> PhysicalRDD [key#0,value#1], MapPartitionsRDD[1]
> ```
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
