[C++][Parquet] Build logical schema tree mapping Arrow fields to Parquet schema levels #22477
Description
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
Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm
Related issues:
- [Python] Support reading Parquet binary/string columns directly as DictionaryArray (is depended upon by)
PRs and other links:
Note: This issue was originally created as ARROW-6077. Please see the migration documentation for further details.