[jira] [Resolved] (ARROW-12254) [Rust][DataFusion] Limit keeps polling input after limit is reached

["Andrew Lamb (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-12254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Lamb resolved ARROW-12254.
---------------------------------
    Fix Version/s: 4.0.0
       Resolution: Fixed

Issue resolved by pull request 9926
[https://github.com/apache/arrow/pull/9926]

> [Rust][DataFusion] Limit keeps polling input after limit is reached
> -------------------------------------------------------------------
>
>                 Key: ARROW-12254
>                 URL: https://issues.apache.org/jira/browse/ARROW-12254
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Rust - DataFusion
>            Reporter: Andrew Lamb
>            Assignee: Andrew Lamb
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>          Time Spent: 3h 50m
>  Remaining Estimate: 0h
>
> Once the number of rows needed for a limit query has been produced, any further work done to read values from its input is wasted.
> The current implementation of LimitStream will keep polling its input for the next value, and returning Poll::Ready(None) , even once the limit has been reached
> This is wasteful



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