Cases in broadcasting columns

[jishnub]

Using arrays

julia> B = brand(5000,5000,0,0); v = rand(size(B,1)); B2 = brand(5000,5000,2,2);

we obtain

Operation	Master	PR
B .* v	32.329 μs	28.289 μs
v .* B	38.244 μs	30.009 μs
B2 .* v	61.873 μs	59.356 μs
v .* B2	83.148 μs	72.213 μs

[codecov]

Codecov Report

Base: 82.08% // Head: 81.84% // Decreases project coverage by -0.24% ⚠️

Coverage data is based on head (5752977) compared to base (bcedda1).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
- Coverage   82.08%   81.84%   -0.24%     
==========================================
  Files          24       24              
  Lines        3321     3333      +12     
==========================================
+ Hits         2726     2728       +2     
- Misses        595      605      +10     

Impacted Files	Coverage Δ
src/generic/broadcast.jl	93.93% <50.00%> (-1.40%)	⬇️

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[jishnub]

I can't really think of tests for the non-standard branches