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https://issues.apache.org/jira/browse/ARROW-7681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17068757#comment-17068757
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Andy Grove commented on ARROW-7681:
-----------------------------------
Deferring this to 1.0.0 due to the concerns about the PR adding further
dependencies on unstable Rust features
> [Rust] 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
> Components: Rust
> Reporter: Max Burke
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> 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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