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https://issues.apache.org/jira/browse/ARROW-8659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chao Sun updated ARROW-8659:
----------------------------
Component/s: Rust
> [Rust] ListBuilder and FixedSizeListBuilder capacity
> ----------------------------------------------------
>
> Key: ARROW-8659
> URL: https://issues.apache.org/jira/browse/ARROW-8659
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust
> Reporter: Raphael Taylor-Davies
> Assignee: Raphael Taylor-Davies
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Both ListBuilder and FixedSizeListBuilder accept a values_builder as a
> constructor argument and then set the capacity of their internal builders
> based off the length of this values_builder. Unfortunately at construction
> time this values_builder is normally empty, and consequently programs spend
> an unnecessary amount of time reallocating memory.
>
> This should be addressed by adding new constructor methods that allow
> specifying the desired capacity upfront.
>
>
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