[jvm-packages] For Performance consideration and Alignment input parameter of repartition function

[KyleLi1985]

No description provided.

[codecov-io]

Codecov Report

Merging #4049 into master will increase coverage by 3.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4049      +/-   ##
==========================================
+ Coverage   57.66%   60.77%   +3.11%     
==========================================
  Files         121      130       +9     
  Lines       10169    11705    +1536     
==========================================
+ Hits         5864     7114    +1250     
- Misses       4305     4591     +286

Impacted Files	Coverage Δ
src/objective/multiclass_obj.cu	92.63% <0%> (-1.06%)	⬇️
python-package/xgboost/compat.py	89.09% <0%> (ø)
python-package/xgboost/libpath.py	70.83% <0%> (ø)
python-package/xgboost/core.py	77.38% <0%> (ø)
python-package/xgboost/sklearn.py	86.89% <0%> (ø)
python-package/xgboost/callback.py	87.9% <0%> (ø)
python-package/xgboost/__init__.py	86.66% <0%> (ø)
python-package/xgboost/rabit.py	42.85% <0%> (ø)
python-package/xgboost/training.py	97.02% <0%> (ø)
python-package/xgboost/plotting.py	79.23% <0%> (ø)

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[CodingCat]

merged thanks