Github user brkyvz commented on a diff in the pull request:
https://github.com/apache/spark/pull/16970#discussion_r101824789
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala
---
@@ -60,6 +68,14 @@ object UnsupportedOperationChecker {
"streaming DataFrames/Datasets")(plan)
}
+ // Disallow multiple streaming deduplications
--- End diff --
we should support these. Example use case:
I dedup on some higher level columns to gain exactly once semantics
(infrastructure/application specific). Then I do data transformations, then I
do a dedup on some more specific data, e.g. region (query specific)
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