[I] Option to disable dimension sorting of GroupBy query result (druid)

["takaaki7 (via GitHub)" <gi...@apache.org>]

takaaki7 opened a new issue, #15225:
URL: https://github.com/apache/druid/issues/15225

   ### Description
   Currently GroupBy query result is sorted by dimension key, and we cannot optout
   https://github.com/takaaki7/druid/blob/97207cdcc7c8445bd3875bae0c41e5d2c0c9b082/processing/src/main/java/org/apache/druid/query/groupby/epinephelinae/RowBasedGrouperHelper.java#L581
   
   Sorting causes much overhead, especially the result is large. I want to disable it.
   It seems the implementation is following.
   - Sort each parallelized results(per processing thread).
   - Combine all iterators and for every `next()` call, check what iterator is the next one by comparing head elements order.
     - https://github.com/takaaki7/druid/blob/08b5951cc53c4fe474a129500c62a6adad78337f/processing/src/main/java/org/apache/druid/java/util/common/guava/MergeIterator.java#L81
     - https://github.com/takaaki7/druid/blob/08b5951cc53c4fe474a129500c62a6adad78337f/processing/src/main/java/org/apache/druid/java/util/common/guava/MergeIterator.java#L53


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