[jira] [Assigned] (ARROW-6077) [C++][Parquet] Build logical schema tree mapping Arrow fields to Parquet schema levels

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-6077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney reassigned ARROW-6077:
-----------------------------------

    Assignee: Wes McKinney

> [C++][Parquet] Build logical schema tree mapping Arrow fields to Parquet schema levels
> --------------------------------------------------------------------------------------
>
>                 Key: ARROW-6077
>                 URL: https://issues.apache.org/jira/browse/ARROW-6077
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Assignee: Wes McKinney
>            Priority: Major
>             Fix For: 1.0.0
>
>
> In several places in cpp/src/parquet/arrow, the {{FromParquetSchema}} function is used to construct fields using a filtered "view" of the Parquet schema. This is a hack caused by the lack of some kind of a "schema tree" which maps Parquet concepts to Arrow {{Field}} objects. 
> One manifestation of this issue is that I was unable to implement dictionary encoded subfields in cases like {{list<string>}}, where you want the inner field to be dictionary-encoded. 
> Patch forthcoming



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