Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/16970#discussion_r101834289
--- 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 --
Why is deduplication exclusive to streaming? Even if we don't want to
implement a batch operator, I'd still allow it in the logical plan and just
translate it to normal aggregation.
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