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https://issues.apache.org/jira/browse/PARQUET-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xianjin YE updated PARQUET-1166:
--------------------------------
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:
{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?
was:
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]@xch
> [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
>
> 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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