Implementation calculations fields (recreate branch)

[miklemv]

continue #83

[codecov]

Codecov Report

Merging #85 into master will increase coverage by 0.68%.
The diff coverage is 92.53%.

@@             Coverage Diff              @@
##             master      #85      +/-   ##
============================================
+ Coverage     61.84%   62.52%   +0.68%     
- Complexity      302      314      +12     
============================================
  Files            31       32       +1     
  Lines          1853     1900      +47     
  Branches        286      286              
============================================
+ Hits           1146     1188      +42     
- Misses          580      585       +5     
  Partials        127      127

Impacted Files	Coverage Δ	Complexity Δ
...jpa/query/schema/impl/GraphQLJpaSchemaBuilder.java	87.12% <100%> (+0.42%)	85 <8> (+5)	⬆️
...a/query/schema/impl/QraphQLJpaBaseDataFetcher.java	72.11% <100%> (ø)	99 <0> (+2)	⬆️
...phql/jpa/query/schema/impl/IntrospectionUtils.java	84.37% <84.37%> (ø)	5 <5> (?)

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[igdianov]

@miklemv Looks good! I will merge it.