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Neville DipaleUwe L. Korn
40cfbcabaab
Neville Dipale authored and Uwe L. Korn committed e6b03db0e11
ARROW-4449: [Rust] Convert File to T: Read + Seek for schema inference

This removes the dependency on `::std::fs::File` when inferring schemas.
I couldn't find a way of inferring schemas without
`Seek`.

The downside's that we can't use a `ReaderBuilder` on `::std::io::Cursor`.

Author: Neville Dipale <nevilledips@gmail.com>

Closes #3541 from nevi-me/rust/arrow-4449 and squashes the following commits:

e116cb5e <Neville Dipale> Arrow-4449:  Convert File to T: Read + Seek for schema inference