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https://issues.apache.org/jira/browse/ARROW-8862?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kouhei Sutou reassigned ARROW-8862:
-----------------------------------
Assignee: Simon Watts
> [C++] NumericBuilder does not use MemoryPool passed to CTOR
> -----------------------------------------------------------
>
> Key: ARROW-8862
> URL: https://issues.apache.org/jira/browse/ARROW-8862
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 0.15.0
> Reporter: Simon Watts
> Assignee: Simon Watts
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {{NumericBuilder}} uses the {{pool}} ({{MemoryPool*}}) parameter to
> initialise the {{ArrayBuilder}} base class, but does not use it to initialise
> its own internal builder, {{data_builder_}} ({{TypedBufferBuilder}}). For
> comparison {{ArrayBuilder}} uses the {{pool}} to initialise its own
> {{null_bitmap_builder_}} member (also a {{TypedBufferBuilder}}).
> Found in version 0.15.0, present in current head.
> This effect was observed when trying to switch to a custom {{MemoryPool}} for
> performance reasons. A hook was used to detect any use of the {{MemoryPool}}
> proved by {{default_memory_pool()}}.
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