Robert Gruener created PARQUET-1370: ---------------------------------------
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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)