[Backport] fix group-by v2 BufferArrayGrouper for empty multi-value dimension row#7803
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fjy merged 1 commit intoapache:0.15.0-incubatingfrom May 31, 2019
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apache#7794) * fix groupby v2 BufferArrayGrouper * better name test * fix sql compatible null handling array grouper bug * another test
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apache#7794) (apache#7803) * fix groupby v2 BufferArrayGrouper * better name test * fix sql compatible null handling array grouper bug * another test
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Backport of #7794 to 0.15.0-incubating.