[
https://issues.apache.org/jira/browse/PARQUET-1370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16584397#comment-16584397
]
Robert Gruener commented on PARQUET-1370:
-----------------------------------------
That seems to only be the case for python3. Do the pyarrow file handles no
implement RawIOBase in python2 as well? As far as I can tell the code does not
suggest that though those have been my results.
> [C++] Read consecutive column chunks in a single scan
> -----------------------------------------------------
>
> Key: PARQUET-1370
> URL: https://issues.apache.org/jira/browse/PARQUET-1370
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-cpp
> Reporter: Robert Gruener
> Priority: Major
>
> Currently parquet-cpp calls for a filesystem scan with every single data page
> see
> [https://github.com/apache/parquet-cpp/blob/a0d1669cf67b055cd7b724dea04886a0ded53c8f/src/parquet/column_reader.cc#L181]
> For remote filesystems this can be very inefficient when reading many small
> columns. The java implementation already does this and will read consecutive
> column chunks (and the resulting pages) in a single scan see
> [https://github.com/apache/parquet-mr/blob/master/parquet-hadoop/src/main/java/org/apache/parquet/hadoop/ParquetFileReader.java#L786]
>
> This might be a bit difficult to do, as it would require changing a lot of
> the code structure but it would certainly be valuable for workloads concerned
> with optimal read performance.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
