[
https://issues.apache.org/jira/browse/ARROW-6774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16943703#comment-16943703
]
Wes McKinney commented on ARROW-6774:
-------------------------------------
Row-by-row iteration is going to be slow compared with vectorized /
column-by-column reads. This unfinished PR was related to this (I think?) but
there are Arrow-based readers available that don't require it
https://github.com/apache/arrow/pull/3461
> [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.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
