Andy Grove created ARROW-6274:
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Summary: [Rust] [DataFusion] Add support for writing results to CSV
Key: ARROW-6274
URL: https://issues.apache.org/jira/browse/ARROW-6274
Project: Apache Arrow
Issue Type: Improvement
Components: Rust, Rust - DataFusion
Reporter: Andy Grove
There is currently no simple way to result query results to CSV. It would be
good to have convenience methods either in ExecutionContext or separate utility
methods to enable results to be written in CSV format to stdout or to a file.
There is sample code in unit tests for this and the approach is to iterate over
each row in a batch and then iterate over each column and downcast it to an
appropriate type (based on the schema associated with the batch) and then pull
out the value for the row.
See
[https://github.com/apache/arrow/blob/master/rust/datafusion/tests/sql.rs#L425-L497]
for example code in a test
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