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https://issues.apache.org/jira/browse/ARROW-6411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16920531#comment-16920531
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Wes McKinney commented on ARROW-6411:
-------------------------------------
I'll see if it shows up in a C++ benchmark also, will be easier to run on other
systems.
> [C++][Parquet] DictEncoderImpl<T>::PutIndicesTyped has bad performance on
> some systems
> --------------------------------------------------------------------------------------
>
> Key: ARROW-6411
> URL: https://issues.apache.org/jira/browse/ARROW-6411
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Fix For: 0.15.0
>
>
> I was doing some benchmarking and noticed that this function showed up as
> slow due to {{\_\_memmove_avx_unaligned_erms}}. I'm interested to investigate
> why this is, but for me it's fixed by changing the {{std::vector::reserve}}
> call to {{std::vector::resize}} and instead assigning elements into
> {{buffered_indices_}}. I'll add a Python benchmark that illustrates the
> problem to see if it shows up on other systems
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