gianm opened a new pull request #8013: GroupBy: Fix improper uses of 
StorageAdapter#getColumnCapabilities.
URL: https://github.com/apache/incubator-druid/pull/8013
 
 
   1) A usage in "isArrayAggregateApplicable" that would potentially 
incorrectly use
      array-based aggregation on a virtual column that shadows a real column.
   2) A usage in "process" that would potentially use the more expensive 
multi-value
      aggregation path on a singly-valued virtual column. (No correctness 
issue, but
      a performance issue.)

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