[PARQUET-1166] [API Proposal] Add GetRecordBatchReader in parquet/arrow/reader.h

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: cpp-1.5.0
• Component/s: parquet-cpp
• Assignee: YE
• Reporter: YE
• Created: 27/Nov/17 05:59
• Updated: 23/Jun/24 03:29
• Resolved: 23/Mar/18 20:03

Description

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:

::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);

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)

wesmckinnxhochy What do you think?

Issue Links

• links to: GitHub Pull Request #445