[jira] [Updated] (ARROW-6774) [Rust] Reading parquet file is slow

["Sietse Brouwer (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-6774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sietse Brouwer updated ARROW-6774:
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    Attachment: data.py

> [Rust] 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
>            Priority: Major
>         Attachments: data.py, main.rs
>
>
> 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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