simplify tables code

[piever]

No description provided.

[codecov-io]

Codecov Report

Merging #54 into master will increase coverage by 4.22%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
+ Coverage   85.51%   89.74%   +4.22%     
==========================================
  Files           8        8              
  Lines         290      273      -17     
==========================================
- Hits          248      245       -3     
+ Misses         42       28      -14

Impacted Files	Coverage Δ
src/tables.jl	42.85% <100%> (-17.15%)	⬇️
src/structarray.jl	91.02% <0%> (+4.44%)	⬆️
src/sort.jl	90.14% <0%> (+5.93%)	⬆️
src/collect.jl	96.61% <0%> (+7.54%)	⬆️

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