Github user superbobry commented on the issue:
https://github.com/apache/spark/pull/17230
Here're the result of piping [The Sonnets by W.
Sheakespear](https://www.gutenberg.org/cache/epub/1105/pg1105.txt) via `cat`
using either `PipedRDD` or hand-patched `PipedRDD` with I/O formats. The
version of Spark used is 1.6.3.
```
Benchmark Mode Cnt Score Error Units
pipe avgt 60 12,141 ± 0,862 ms/op
pipeFormatted avgt 60 12,603 ± 0,639 ms/op
```
There is a ~4% difference in average time, which however is within the
standard error. I suspect we can do better at the expense of complicating the
code, so I'd rather not do it in this PR. What do you think?
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