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Posted to jira@arrow.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/04/07 13:28:00 UTC
[jira] [Updated] (ARROW-12254) [Rust][DataFusion] Limit keeps
polling input after limit is reached
[ https://issues.apache.org/jira/browse/ARROW-12254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated ARROW-12254:
-----------------------------------
Labels: pull-request-available (was: )
> [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
> Reporter: Andrew Lamb
> Assignee: Andrew Lamb
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> 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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