Github user kiszk commented on the pull request:
https://github.com/apache/spark/pull/11636#issuecomment-199444953
Here are benchmark results in the latest code.
Without this PR
```
model name : Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz
Partitioned Table: Best/Avg Time(ms) Rate(M/s) Per
Row(ns) Relative
-------------------------------------------------------------------------------------------
Read data column 484 / 529 32.5
30.7 1.0X
Read partition column 323 / 368 48.7
20.5 1.5X
Read both columns 617 / 654 25.5
39.2 0.8X
```
With this PR
```
model name : Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz
Partitioned Table: Best/Avg Time(ms) Rate(M/s) Per
Row(ns) Relative
-------------------------------------------------------------------------------------------
Read data column 412 / 444 38.2
26.2 1.0X
Read partition column 290 / 327 54.2
18.4 1.4X
Read both columns 516 / 613 30.5
32.8 0.8X
```
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