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Posted to dev@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2019/07/31 02:54:00 UTC

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

Wes McKinney created ARROW-6077:
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             Summary: [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
             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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