Refactor LocIndexerLike__getitem__.

[ueshin]

No description provided.

[HyukjinKwon]

Looks good if tests pass

[codecov-io]

Codecov Report

Merging #1152 into master will decrease coverage by 0.07%.
The diff coverage is 90.32%.

@@            Coverage Diff             @@
##           master    #1152      +/-   ##
==========================================
- Coverage   95.24%   95.16%   -0.08%     
==========================================
  Files          35       35              
  Lines        7080     7080              
==========================================
- Hits         6743     6738       -5     
- Misses        337      342       +5

Impacted Files	Coverage Δ
databricks/koalas/indexing.py	93.7% <90.32%> (-1.75%)	⬇️

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[ueshin]

Thanks! I'd merge this now.