gianm opened a new pull request #6403: SQL: Fix too-strict check in SortProject.
URL: https://github.com/apache/incubator-druid/pull/6403
 
 
   The "Duplicate field name" check on inputRowSignature is too strict:
   it is actually fine for a row signature to have the same field name
   twice. It happens when the same expression is selected twice, and
   both selections map to the same Druid object (dimension, aggregator,
   etc).
   
   I did not succeed in writing a test that triggers this, but I did see
   it occur in production for a complex query with hundreds of aggregators.

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