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[SPARK-24369][SQL] Correct handling for multiple distinct aggregation…
…s having the same argument set ## What changes were proposed in this pull request? bring back #21443 This is a different approach: just change the check to count distinct columns with `toSet` ## How was this patch tested? a new test to verify the planner behavior. Author: Wenchen Fan <firstname.lastname@example.org> Author: Takeshi Yamamuro <email@example.com> Closes #21487 from cloud-fan/back. (cherry picked from commit 416cd1f) Signed-off-by: Xiao Li <firstname.lastname@example.org>
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