Support DISTINCT on multiple MV columns

[Jackie-Jiang]

Subtask of #8850

• Support DISTINCT on multiple columns (including MV).
• The behavior is the same as group-by on multiple columns, where we return all the value combinations if there are multiple MV columns

E.g. If a row has colA (MV): [0, 1], colB (MV): [2, 3], colC (SV): 4, SELECT DISTINCT colA, colB, colC will get 4 combinations from this row: [0, 2, 4], [0, 3, 4], [1, 2, 4], [1, 3, 4]

Release-Notes

Support DISTINCT on multiple MV columns. The behavior is the same as group-by on multiple columns (return all the value combinations if there are multiple MV columns).

[codecov-commenter]

Codecov Report

Merging #8873 (77e2f5e) into master (6984719) will increase coverage by 0.03%.
The diff coverage is 68.37%.

@@             Coverage Diff              @@
##             master    #8873      +/-   ##
============================================
+ Coverage     69.71%   69.75%   +0.03%     
+ Complexity     4993     4600     -393     
============================================
  Files          1804     1805       +1     
  Lines         93883    94073     +190     
  Branches      13981    14039      +58     
============================================
+ Hits          65453    65623     +170     
- Misses        23884    23889       +5     
- Partials       4546     4561      +15     

Flag	Coverage Δ
integration1	26.34% <18.37%> (+0.05%)	⬆️
integration2	24.81% <18.37%> (-0.09%)	⬇️
unittests1	66.49% <63.67%> (+0.05%)	⬆️
unittests2	15.42% <0.00%> (-0.07%)	⬇️

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

Impacted Files	Coverage Δ
...y/distinct/raw/RawMultiColumnDistinctExecutor.java	52.04% <43.37%> (-36.85%)	⬇️
...not/core/query/distinct/DistinctExecutorUtils.java	73.80% <73.80%> (ø)
...ictionaryBasedMultiColumnDistinctOnlyExecutor.java	87.09% <84.61%> (+0.43%)	⬆️
...ionaryBasedMultiColumnDistinctOrderByExecutor.java	98.14% <96.77%> (+0.71%)	⬆️
...t/core/query/distinct/DistinctExecutorFactory.java	88.09% <100.00%> (+0.59%)	⬆️
...ller/helix/core/minion/TaskTypeMetricsUpdater.java	80.00% <0.00%> (-20.00%)	⬇️
...onaryBasedSingleColumnDistinctOrderByExecutor.java	56.66% <0.00%> (-20.00%)	⬇️
...nction/DistinctCountBitmapAggregationFunction.java	47.66% <0.00%> (-11.40%)	⬇️
...ntroller/helix/core/minion/TaskMetricsEmitter.java	86.04% <0.00%> (-4.66%)	⬇️
...r/validation/RealtimeSegmentValidationManager.java	76.05% <0.00%> (-2.82%)	⬇️
... and 30 more

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[xiangfu0]

Please put examples for release notes of the multi-value behavior.