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https://issues.apache.org/jira/browse/PARQUET-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16404402#comment-16404402
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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-374107728
ping @wesm @xhochy
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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&
> row_group_indices,
>
> std::shared_ptr<::arrow::RecordBatchReader>* out);
>
> ::arrow::Status GetRecordBatchReader(const std::vector&
> row_group_indices,
> const
> std::vector& 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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