Optimize count queries

[tntrex]

[codecov[bot]]

Codecov Report

Merging #239 (e3099fd) into master (4018f8a) will decrease coverage by 0.02%. The diff coverage is 90.90%.

@@             Coverage Diff              @@
##             master     #239      +/-   ##
============================================
- Coverage     94.80%   94.78%   -0.03%     
- Complexity      991      998       +7     
============================================
  Files            86       86              
  Lines          2485     2510      +25     
============================================
+ Hits           2356     2379      +23     
- Misses          129      131       +2     

Impacted Files	Coverage Δ
src/Select/Loader/ManyToManyLoader.php	95.12% <0.00%> (-2.38%)	:arrow_down:
src/ORM.php	95.00% <100.00%> (ø)
src/Select.php	91.02% <100.00%> (-0.44%)	:arrow_down:
src/Select/AbstractLoader.php	89.36% <100.00%> (-0.30%)	:arrow_down:
src/Select/JoinableLoader.php	90.72% <100.00%> (+0.61%)	:arrow_up:
src/Select/Loader/HasManyLoader.php	100.00% <100.00%> (ø)
src/Select/RootLoader.php	100.00% <100.00%> (ø)
src/RelationMap.php	100.00% <0.00%> (ø)
src/Parser/ArrayNode.php	100.00% <0.00%> (ø)
... and 7 more

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