Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3471#discussion_r104613673
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/dataSet/DataSetAggregateRule.scala
---
@@ -42,6 +41,14 @@ class DataSetAggregateRule
return false
}
+ // distinct is translated into dedicated operator
+ if (agg.getAggCallList.isEmpty &&
+ agg.getGroupCount == agg.getRowType.getFieldCount &&
--- End diff --
During testing I observed a case where a projection wasn't pushed down.
Without this check, the grouping would happen on a subset of fields and
only those would be emitted. It is not possible to change the input and output
types of a ReduceFunction (which is used to implement Distinct in a
hash-combinable way), I check that the input and output types are identical.
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