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From "Wenchen Fan (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-25353) executeTake in SparkPlan could decode rows more than necessary.
Date Tue, 02 Jul 2019 13:03:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-25353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wenchen Fan reassigned SPARK-25353:
-----------------------------------

    Assignee: Dooyoung Hwang

> executeTake in SparkPlan could decode rows more than necessary.
> ---------------------------------------------------------------
>
>                 Key: SPARK-25353
>                 URL: https://issues.apache.org/jira/browse/SPARK-25353
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 2.3.1
>            Reporter: Dooyoung Hwang
>            Assignee: Dooyoung Hwang
>            Priority: Major
>             Fix For: 3.0.0
>
>
> In some cases, executeTake in SparkPlan could decode more than necessary.
> For example, df.limit(1000).collect() is executed.
>   +- executeTake in SparkPlan is called with arg 1000.
>       +- If total rows count from partitions is 2000, executeTake decode them and create
array of InternalRow whose size is 2000.
>       +- Slice the first 1000 rows, and return them. 1000 rows in the rear are not used.
>  



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