ASF GitHub Bot commented on PARQUET-1166:

advancedxy commented on issue #445: [WIP] PARQUET-1166: Add 
GetRecordBatchReader in parquet/arrow/reader
URL: https://github.com/apache/parquet-cpp/pull/445#issuecomment-372669874
   @wesm @xhochy do you have any other comments, in particular with:
   1. Document wording since I am not a native speaker
   2. The approach with generating table of row group first, then constructing 
a TableBatchReader
   3. More test cases should be added?
   If not, I will update the PR title, and maybe rebase commits to get a better 
commit history, then it should be ready for merging.

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> [API Proposal] Add GetRecordBatchReader in parquet/arrow/reader.h
> -----------------------------------------------------------------
>                 Key: PARQUET-1166
>                 URL: https://issues.apache.org/jira/browse/PARQUET-1166
>             Project: Parquet
>          Issue Type: Improvement
>          Components: parquet-cpp
>            Reporter: Xianjin YE
>            Priority: Major
> Hi, I'd like to proposal a new API to better support splittable reading for 
> Parquet File.
> The intent for this API is that we can selective reading RowGroups(normally 
> be contiguous, but can be arbitrary as long as the row_group_idxes are sorted 
> and unique, [1, 3, 5] for example). 
> The proposed API would be something like this:
> {code:java}
> ::arrow::Status GetRecordBatchReader(const std::vector<int>& 
> row_group_indices,
> std::shared_ptr<::arrow::RecordBatchReader>* out);
> ::arrow::Status GetRecordBatchReader(const std::vector<int>& 
> row_group_indices,
>                                                                 const 
> std::vector<int>& column_indices,
> std::shared_ptr<::arrow::RecordBatchReader>* out);
> {code}
> With new API, we can split Parquet file into RowGroups and can be processed 
> by multiple tasks(maybe be on different hosts, like the Map task in MapReduce)
> [~wesmckinn][~xhochy] What do you think?

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