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Posted to issues@arrow.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2019/07/31 03:02:00 UTC
[jira] [Updated] (ARROW-6077) [C++][Parquet] Build logical schema
tree mapping Arrow fields to Parquet schema levels
[ https://issues.apache.org/jira/browse/ARROW-6077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated ARROW-6077:
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Labels: pull-request-available (was: )
> [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
> Labels: pull-request-available
> 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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