[SPARK-33183][SQL][2.4] Fix Optimizer rule EliminateSorts and add a physical rule to remove redundant sorts#30194

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allisonwang-db:SPARK-33183-branch-2.4

Commits on Oct 29, 2020

[SPARK-33183][SQL] Fix Optimizer rule EliminateSorts and add a physical rule to remove redundant sorts
allisonwang-db
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Commits on Oct 30, 2020

fix tests
allisonwang-db
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