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Posted to dev@parquet.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/02/28 13:06:00 UTC
[jira] [Commented] (PARQUET-1166) [API Proposal] Add
GetRecordBatchReader in parquet/arrow/reader.h
[ https://issues.apache.org/jira/browse/PARQUET-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16380267#comment-16380267 ]
ASF GitHub Bot commented on PARQUET-1166:
-----------------------------------------
advancedxy opened a new pull request #445: [WIP] PARQUET-1166: Add GetRecordBatchReader in parquet/arrow/reader
URL: https://github.com/apache/parquet-cpp/pull/445
Ping @xhochy @wesm.
Sorry for the delay, I finally get some time to finish this feature.
This is just work in progress, but I want to get feedback before any further.
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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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