fhueske commented on a change in pull request #6521: [FLINK-5315][table] Adding
support for distinct operation for table API on DataStream
URL: https://github.com/apache/flink/pull/6521#discussion_r211247401
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/scala/expressionDsl.scala
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@@ -214,10 +214,15 @@ trait ImplicitExpressionOperations {
def varSamp = VarSamp(expr)
/**
- * Returns multiset aggregate of a given expression.
+ * Returns multiset aggregate of a given expression.
*/
def collect = Collect(expr)
+ /**
+ * Returns a distinct field reference to a given expression
+ */
+ def distinct = DistinctAgg(expr)
Review comment:
make this a method of `Aggregation` to ensure it is only called on
aggregation expressions
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