Neville Dipale created ARROW-5191:
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             Summary: [Rust] Expose schema in readers (CSV, JSON) without 
reading batches
                 Key: ARROW-5191
                 URL: https://issues.apache.org/jira/browse/ARROW-5191
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Rust
            Reporter: Neville Dipale


It's sometimes convenient to be able to view a datasource's schema without 
reading the first record batch. This is a proposal to create a `pub fn 
schema(&self) -> Arc<Schema>` on the various readers that we support.

I think this would also enable schema inference in datafusion



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