Alec Posney updated ARROW-2090:
    Summary: [Python] Add context manager methods to ParquetWriter  (was: Add 
context manager methods to ParquetWriter)

> [Python] Add context manager methods to ParquetWriter
> -----------------------------------------------------
>                 Key: ARROW-2090
>                 URL: https://issues.apache.org/jira/browse/ARROW-2090
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Alec Posney
>            Priority: Minor
>              Labels: pull-request-available
> Add the ability to use python {{with}} syntax on the {{ParquetWriter}} object.
> For example:
> {code:python}
> with pq.ParquetWriter(foo, schema) as writer:
>     writer.write_table(table)
> {code}
> The benefit of this syntax is that it removes the chances of you writing out 
> a partial (invalid) parquet file, which is currently possible if you forget 
> to call the close method, or more likely the close method is not called due 
> to an exception being thrown. 
> It should still be possible to use the previous syntax for backwards 
> compatibility and fine grained control reasons.
> Similarly, the {{parquet}} module level {{write_table}} method should be able 
> to use the new syntax without changing previous behaviour. 

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