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Sutou Kouhei
dfe34c7f511
Sutou Kouhei authored af64b7b0acd
ARROW-6232: [C++] Rename Argsort kernel to SortToIndices

"Argsort" is NumPy specific name. Other languages/libraries use
different name:

  * R: order
    * https://cran.r-project.org/doc/manuals/r-release/fullrefman.pdf#Rfn.order

  * MATLAB: sort
    * https://mathworks.com/help/matlab/ref/sort.html
    * "sort" returns sorted array and indices to sort array

  * Julia: sortperm
    * https://pkg.julialang.org/docs/julia/THl1k/1.1.1/base/sort.html#Base.sortperm

It's better that we use general name because Arrow C++ isn't a NumPy
compatible library.

"SortToIndices" means "sort that returns indices array".

Closes #5080 from kou/cpp-argsort-to-sort-indicies and squashes the following commits:

2c2647388 <Sutou Kouhei>  Rename Argsort kernel to SortToIndices

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>