Commits
Antoine Pitrou authored and Korn, Uwe committed fa4f2aaa48f
ARROW-2838: [Python] Speed up PandasObjectIsNull
Results for microbenchmarks.PandasObjectIsNull.time_PandasObjectIsNull:
* before:
```
========= =============
type
--------- -------------
int 1.35±0.02ms
float 1.54±0.02ms
object 1.25±0ms
decimal 20.8±0.5ms
========= =============
```
* after:
```
========= ============
type
--------- ------------
int 811±10μs
float 1.54±0ms
object 1.37±0ms
decimal 22.0±0.7ms
========= ============
```
Author: Antoine Pitrou <antoine@python.org>
Closes #2258 from pitrou/ARROW-2838-pandas-is-null-perf and squashes the following commits:
0fb6898c <Antoine Pitrou> ARROW-2838: Speed up PandasObjectIsNull