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[SPARK-23199][SQL] improved Removes repetition from group expressions…
… in Aggregate ## What changes were proposed in this pull request? Currently, all Aggregate operations will go into RemoveRepetitionFromGroupExpressions, but there is no group expression or there is no duplicate group expression in group expression, we not need copy for logic plan. ## How was this patch tested? the existed test case. Author: caoxuewen <email@example.com> Closes #20375 from heary-cao/RepetitionGroupExpressions. (cherry picked from commit 54dd7cf) Signed-off-by: gatorsmile <firstname.lastname@example.org>
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