Robert Gruener created PARQUET-1370:
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Summary: 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
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.
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