[SPARK-36183][SQL] Push down limit 1 through Aggregate if it is group only#33397

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Commits on Jul 16, 2021

Push down limit 1 through Aggregate if it is group only.
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Commits on Jul 19, 2021

fix
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Commits on Jul 20, 2021

Update sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala

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