[SPARK-34541][CORE] Fixed an issue where data could not be cleaned up when unregisterShuffle.#31648

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yikf wants to merge 3 commits intoapache:branch-3.0from

yikf:branch-3.0

Commits on Feb 7, 2021

[SPARK-34395][SQL]Clean up unused code for code simplifications.
yikf
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Commits on Feb 25, 2021

[SPARK-34541][core]Fixed an issue where data could not be cleaned up when unregisterShuffle.
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Merge branch 'branch-3.0' of github.com:yikf/spark into branch-3.0
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