Allow server to directly return the final aggregation result

[Jackie-Jiang]

When there is only one server queried, we can calculate the final aggregation result on the server side, instead of serializing back the intermediate result (which can be huge for distinct_count, percentile etc.).

This PR adds a new query option serverReturnFinalResult to let the server directly return the final aggregation result. As a follow up, we may add a flag to the broker config to let the broker automatically add this query option when it is querying only one server.

[codecov-commenter]

Codecov Report

Merging #9304 (a2a36a4) into master (784f995) will decrease coverage by 0.04%.
The diff coverage is 65.72%.

@@             Coverage Diff              @@
##             master    #9304      +/-   ##
============================================
- Coverage     69.77%   69.73%   -0.05%     
- Complexity     4692     4771      +79     
============================================
  Files          1873     1874       +1     
  Lines         99570    99706     +136     
  Branches      15160    15185      +25     
============================================
+ Hits          69477    69526      +49     
- Misses        25156    25247      +91     
+ Partials       4937     4933       -4     

Flag	Coverage Δ
integration1	26.21% <30.04%> (+0.05%)	⬆️
integration2	24.89% <56.80%> (+0.07%)	⬆️
unittests1	66.94% <33.33%> (-0.10%)	⬇️
unittests2	15.28% <0.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
.../columnminmaxvalue/ColumnMinMaxValueGenerator.java	73.68% <0.00%> (ø)
...a/org/apache/pinot/segment/spi/ColumnMetadata.java	80.00% <0.00%> (-20.00%)	⬇️
...java/org/apache/pinot/segment/spi/V1Constants.java	12.50% <ø> (ø)
...va/org/apache/pinot/spi/utils/CommonConstants.java	27.69% <ø> (ø)
...aggregation/function/AggregationFunctionUtils.java	71.11% <33.33%> (-18.89%)	⬇️
...erator/blocks/results/AggregationResultsBlock.java	72.15% <48.78%> (-23.60%)	⬇️
...e/operator/blocks/results/GroupByResultsBlock.java	84.11% <50.00%> (-1.61%)	⬇️
...core/query/reduce/AggregationDataTableReducer.java	78.57% <62.50%> (-2.39%)	⬇️
...not/core/query/reduce/GroupByDataTableReducer.java	82.87% <67.90%> (-9.26%)	⬇️
.../org/apache/pinot/core/util/QueryOptionsUtils.java	68.00% <84.61%> (+1.33%)	⬆️
... and 36 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more