Github user brkyvz commented on a diff in the pull request: https://github.com/apache/spark/pull/16970#discussion_r101824321 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala --- @@ -35,6 +35,9 @@ object UnsupportedOperationChecker { case p if p.isStreaming => throwError("Queries with streaming sources must be executed with writeStream.start()")(p) + case p: Deduplication => + throwError("Batch queries should not use Deduplication")(p) --- End diff -- because of this, I would prefer the naming to imply that as well. Maybe rename `Deduplication` to `StreamingDeduplication` or something.
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