Support DISTINCT on single MV column

[Jackie-Jiang]

Subtask of #8850

• Support DISTINCT on single MV column.
• Add test for DISTINCT over Big-decimal and single MV columns

Release-Notes

Support DISTINCT on single MV column

[codecov-commenter]

Codecov Report

Merging #8857 (869c949) into master (8a71323) will increase coverage by 1.26%.
The diff coverage is 55.20%.

@@             Coverage Diff              @@
##             master    #8857      +/-   ##
============================================
+ Coverage     68.45%   69.72%   +1.26%     
- Complexity     4651     4669      +18     
============================================
  Files          1741     1741              
  Lines         91521    91608      +87     
  Branches      13691    13729      +38     
============================================
+ Hits          62650    63872    +1222     
+ Misses        24472    23292    -1180     
- Partials       4399     4444      +45     

Flag	Coverage Δ
integration1	26.98% <3.64%> (+0.06%)	⬆️
integration2	25.62% <3.64%> (?)
unittests1	66.13% <54.16%> (-0.06%)	⬇️
unittests2	14.12% <0.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
...ctionaryBasedSingleColumnDistinctOnlyExecutor.java	0.00% <0.00%> (ø)
.../raw/RawFloatSingleColumnDistinctOnlyExecutor.java	44.44% <30.76%> (-35.56%)	⬇️
...ct/raw/RawIntSingleColumnDistinctOnlyExecutor.java	44.44% <30.76%> (-35.56%)	⬇️
...t/raw/RawLongSingleColumnDistinctOnlyExecutor.java	44.44% <30.76%> (-35.56%)	⬇️
...raw/RawStringSingleColumnDistinctOnlyExecutor.java	44.44% <30.76%> (-35.56%)	⬇️
...raw/RawDoubleSingleColumnDistinctOnlyExecutor.java	61.11% <46.15%> (-38.89%)	⬇️
...onaryBasedSingleColumnDistinctOrderByExecutor.java	76.66% <72.22%> (-14.64%)	⬇️
.../RawDoubleSingleColumnDistinctOrderByExecutor.java	76.66% <72.22%> (-14.64%)	⬇️
...w/RawFloatSingleColumnDistinctOrderByExecutor.java	76.66% <72.22%> (-14.64%)	⬇️
...raw/RawIntSingleColumnDistinctOrderByExecutor.java	76.66% <72.22%> (-14.64%)	⬇️
... and 148 more

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[xiangfu0]

LGTM