PERF: Checking monotonic-ness before sorting on an index #11080

[scari]

closes #11080

Worked for this during PyCon JP 2015 pandas sprint /w @sinhrks

I found test_frame.py:TestDataFrame.test_sort_index cover this change.

[jreback]

pls add a comment describing what you are doing here and a reference to the issue

[jreback]

pls add some benchmarks that I indicated in the issue (or point to ones that have this covered)

[scari]

Added a frame_sort_index test in frame_methods.py

• 30.96ms 4.64ms 0.15 frame_methods.frame_sort_index.time_frame_sort_index

[jorisvandenbossche]

@scari I think you did something wrong with rebasing (as there are a lot of other commits here). Can yo do

git fetch upstream
git rebase upstream/master

and then push again.

[scari]

@jorisvandenbossche Thanks for your kind guidance! I just push again.

[jreback]

thanks @scari