[jira] [Commented] (ARROW-3769) [C++] Support reading non-dictionary encoded binary Parquet columns directly as DictionaryArray

["Hatem Helal (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-3769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16761825#comment-16761825 ] 

Hatem Helal commented on ARROW-3769:
------------------------------------

Made a start on the unittests here:

[https://github.com/mathworks/arrow/pull/12]

[~wesmckinn], could you take a look and let me know if this is heading in the right direction?

> [C++] Support reading non-dictionary encoded binary Parquet columns directly as DictionaryArray
> -----------------------------------------------------------------------------------------------
>
>                 Key: ARROW-3769
>                 URL: https://issues.apache.org/jira/browse/ARROW-3769
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Assignee: Hatem Helal
>            Priority: Major
>              Labels: parquet
>             Fix For: 0.13.0
>
>
> If the goal is to hash this data anyway into a categorical-type array, then it would be better to offer the option to "push down" the hashing into the Parquet read hot path rather than first fully materializing a dense vector of {{ByteArray}} values, which could use a lot of memory after decompression



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