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Posted to issues@arrow.apache.org by "Max Burke (Jira)" <ji...@apache.org> on 2020/01/26 00:06:00 UTC

[jira] [Created] (ARROW-7681) Explicitly seeking a BufReader will discard the internal buffer

Max Burke created ARROW-7681:
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             Summary: Explicitly seeking a BufReader will discard the internal buffer
                 Key: ARROW-7681
                 URL: https://issues.apache.org/jira/browse/ARROW-7681
             Project: Apache Arrow
          Issue Type: Bug
            Reporter: Max Burke


This behavior was observed in the Parquet Rust file reader (parquet/src/util/io.rs).

 

Pull request: [https://github.com/apache/arrow/pull/6280]

 

From the Rust documentation for BufReader:

 

"Seeking always discards the internal buffer, even if the seek position would otherwise fall within it. This guarantees that calling {{.into_inner()}} immediately after a seek yields the underlying reader at the same position."

 

[https://doc.rust-lang.org/std/io/struct.BufReader.html#impl-Seek]



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