Wes McKinney created ARROW-6411:
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Summary: [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
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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