[jira] [Updated] (PARQUET-1463) [C++] Utilize revamped common hashing machinery for dictionary encoding

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PARQUET-1463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated PARQUET-1463:
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    Labels: pull-request-available  (was: )

> [C++] Utilize revamped common hashing machinery for dictionary encoding
> -----------------------------------------------------------------------
>
>                 Key: PARQUET-1463
>                 URL: https://issues.apache.org/jira/browse/PARQUET-1463
>             Project: Parquet
>          Issue Type: Improvement
>          Components: parquet-cpp
>            Reporter: Wes McKinney
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: cpp-1.6.0
>
>
> [~pitrou] has recently made some significant improvements to hashing / dictionary encoding machinery in Apache Arrow
> https://github.com/apache/arrow/commit/eaf8d32e5f292dca0aa5b5508041d5d39406224d
> parquet-cpp is using a custom hash table
> https://github.com/apache/arrow/blob/master/cpp/src/parquet/encoding-internal.h#L456
> It would be nice to utilize common hash table machinery if possible. We should of course make sure that such a change does not cause performance regressions (performance improved due to Antoine's patch, so perf may also get better on the Parquet write path)



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