[jira] [Assigned] (ARROW-8516) [Rust] Slow BufferBuilder inserts within PrimitiveBuilder::append_slice

["Paddy Horan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-8516?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paddy Horan reassigned ARROW-8516:
----------------------------------

    Assignee: Raphael Taylor-Davies

> [Rust] Slow BufferBuilder<BooleanType> inserts within PrimitiveBuilder::append_slice
> ------------------------------------------------------------------------------------
>
>                 Key: ARROW-8516
>                 URL: https://issues.apache.org/jira/browse/ARROW-8516
>             Project: Apache Arrow
>          Issue Type: Improvement
>            Reporter: Raphael Taylor-Davies
>            Assignee: Raphael Taylor-Davies
>            Priority: Trivial
>              Labels: pull-request-available
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> {color:#000000}BufferBuilder{color}{color:#0073bf}<{color}{color:#000000}BooleanType>::append_slice is called by PrimitiveBuilder{color}{color:#000000}::append_slice with a constructed vector of true values. {color}
> {color:#000000}Even in release builds the associated allocations and iterations are not optimised out, resulting in a third of the time to parse a parquet file containing single integers being spent in PrimitiveBuilder::append_slice.{color}
> {color:#000000}This PR adds an append_n method to the BufferBuilderTrait that allows this to be handled more efficiently. My rather unscientific testing shows it to halve the amount of time spent in this method yielding an ~20% speedup for my particular workload.{color}
>  



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