[cleanup] moving test sql to a yaml file for better readability

[walterddr]

• hard-coded string needs to follow checkstyle. also it cannot be directly copied.
• didn't use json b/c it doesn't support multiline as well as yaml

[agavra]

😍 yessss! can we also do that for QueryRunnerTest and make this a generic thing we can use in lots of tests 🙏

[codecov-commenter]

Codecov Report

Merging #9580 (3de055d) into master (00d35a2) will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #9580      +/-   ##
============================================
+ Coverage     68.75%   68.79%   +0.04%     
- Complexity     4912     5253     +341     
============================================
  Files          1934     1934              
  Lines        103290   103290              
  Branches      15695    15695              
============================================
+ Hits          71016    71061      +45     
+ Misses        27187    27156      -31     
+ Partials       5087     5073      -14     

Flag	Coverage Δ
integration1	26.02% <ø> (+0.05%)	⬆️
unittests1	67.38% <ø> (-0.02%)	⬇️
unittests2	15.62% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../impl/dictionary/BaseOffHeapMutableDictionary.java	81.33% <0.00%> (-3.34%)	⬇️
...gregation/function/StUnionAggregationFunction.java	73.52% <0.00%> (-2.95%)	⬇️
...core/operator/docvalsets/TransformBlockValSet.java	59.43% <0.00%> (-2.84%)	⬇️
...inot/core/operator/filter/FilterOperatorUtils.java	87.50% <0.00%> (-2.50%)	⬇️
...perator/filter/SortedIndexBasedFilterOperator.java	83.80% <0.00%> (-1.91%)	⬇️
...controller/helix/core/minion/PinotTaskManager.java	66.56% <0.00%> (-1.47%)	⬇️
...ery/optimizer/filter/MergeEqInFilterOptimizer.java	92.59% <0.00%> (-1.24%)	⬇️
...org/apache/pinot/core/common/ObjectSerDeUtils.java	90.71% <0.00%> (-0.80%)	⬇️
...core/query/reduce/ExplainPlanDataTableReducer.java	82.99% <0.00%> (-0.69%)	⬇️
...ery/optimizer/filter/NumericalFilterOptimizer.java	80.89% <0.00%> (-0.57%)	⬇️
... and 22 more

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[walterddr]

😍 yessss! can we also do that for QueryRunnerTest and make this a generic thing we can use in lots of tests 🙏

good idea. although there's more to improve in QueryRunnerTest for example

• better data randomness, currently they are hard-coded
• better data type coverage, current only 2 numeric, 2 string and 1 timestamp
• better table schema, currently all are the same.
  let's create an issue to track this?