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https://issues.apache.org/jira/browse/PARQUET-517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16844020#comment-16844020
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Deepak Majeti commented on PARQUET-517:
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The {{std::vector<int> buffered_indices_}} inside {{DictEncoder}} can benefit
using an arrow::MemoryPool. This is significant when there are many columns.
> [C++] Use arrow::MemoryPool for all heap allocations
> ----------------------------------------------------
>
> Key: PARQUET-517
> URL: https://issues.apache.org/jira/browse/PARQUET-517
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-cpp
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Fix For: cpp-1.6.0
>
>
> We are using {{std::vector}} in many places for memory allocation; if we want
> to use SSE on this memory we may run into some problems.
> Couple things we should do
> * Add an STL allocator for {{std::vector}} that ensure 16-byte aligned memory
> * Check user-provided memory for alignment before utilizing an
> SSE-accelerated routine (e.g. SSE hash functions for dictionary encoding) and
> decide whether to copy and use SSE or no-copy and use no-SSE code.
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