gsum works on int64 column, closes #1647 #3464

[jangorecki]

closes #1647
closes #3464

[codecov]

Codecov Report

Merging #3737 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3737      +/-   ##
==========================================
+ Coverage   99.41%   99.41%   +<.01%     
==========================================
  Files          71       71              
  Lines       13160    13199      +39     
==========================================
+ Hits        13083    13122      +39     
  Misses         77       77

Impacted Files	Coverage Δ
src/gsumm.c	100% <100%> (ø)	⬆️

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[codecov]

Codecov Report

Merging #3737 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3737      +/-   ##
==========================================
+ Coverage   98.81%   98.81%   +<.01%     
==========================================
  Files          69       69              
  Lines       13285    13324      +39     
==========================================
+ Hits        13127    13166      +39     
  Misses        158      158

Impacted Files	Coverage Δ
src/gsumm.c	100% <100%> (ø)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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