Github user brkyvz commented on a diff in the pull request: https://github.com/apache/spark/pull/16970#discussion_r101825645 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala --- @@ -112,6 +128,12 @@ object UnsupportedOperationChecker { "it is on aggregated DataFrame/Dataset in Complete output mode. Consider using " + "approximate distinct aggregation (e.g. approx_count_distinct() instead of count()).") + throwErrorIf( + outputMode == InternalOutputModes.Complete + && collectStreamingDeduplications(subPlan).nonEmpty, + "Aggregation on dropDuplicates DataFrame/Dataset in Complete output mode " + --- End diff -- why not?
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