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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