Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/16289#discussion_r92545873
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala
---
@@ -95,6 +96,15 @@ object UnsupportedOperationChecker {
// Operations that cannot exists anywhere in a streaming plan
subPlan match {
+ case Aggregate(_, aggregateExpressions, child) =>
+ val distinctAggExprs = aggregateExpressions.flatMap { expr =>
+ expr.collect { case ae: AggregateExpression if ae.isDistinct
=> ae }
+ }
+ throwErrorIf(
+ child.isStreaming && distinctAggExprs.nonEmpty,
+ "Distinct aggregations are not supported on streaming
DataFrames/Datasets, unless" +
--- End diff --
you need an extra space here. I'd also recommend users using approximate
distinct.
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