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https://issues.apache.org/jira/browse/ARROW-6774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16945776#comment-16945776
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Adam Lippai commented on ARROW-6774:
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While it doesn't support reading Utf8 type, dropping that column then reading
the same file takes less than 3 seconds! Thank you for the contribution. (size
10k row * 3k Float64 columns)
> [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
>
> 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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