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Neville DipaleChao Sun
c3511db97e9
Neville Dipale authored and Chao Sun committed 5f9275e3cdc
ARROW-5191: [Rust] Expose CSV and JSON reader schemas

This is useful for lazy evaluation, because it enables the user to infer the schema of a data source, then use that schema without reading its data.

Author: Neville Dipale <nevilledips@gmail.com>

Closes #4181 from nevi-me/ARROW-5191 and squashes the following commits:

257a98a1 <Neville Dipale> ARROW-5191:  Expose file reader schemas