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From "Adam Lippai (Jira)" <j...@apache.org>
Subject [jira] [Created] (ARROW-6774) Reading parquet file is slow
Date Wed, 02 Oct 2019 22:40:00 GMT
Adam Lippai created ARROW-6774:
----------------------------------

             Summary: Reading parquet file is slow
                 Key: ARROW-6774
                 URL: https://issues.apache.org/jira/browse/ARROW-6774
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Rust
    Affects Versions: 0.15.0
            Reporter: Adam Lippai


Using the example at [https://github.com/apache/arrow/tree/master/rust/parquet] is slow.

The snippet 
{code:none}
let reader = SerializedFileReader::new(file).unwrap();
let mut iter = reader.get_row_iter(None).unwrap();
let start = Instant::now();
while let Some(record) = iter.next() {}
let duration = start.elapsed();
println!("{:?}", duration);
{code}
Runs for 17sec for a ~160MB parquet file.

If there is a more effective way to load a parquet file, it would be nice to add it to the
readme.

P.S.: My goal is to construct an ndarray from it, I'd be happy for any tips.



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