[SPARK-29552][SQL] Execute the "OptimizeLocalShuffleReader" rule when creating new query stage and then can optimize the shuffle reader to local shuffle reader as much as possible.#26207

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JkSelf wants to merge 3 commits intoapache:masterfrom

JkSelf:resolve-multi-joins-issue

Commits on Oct 22, 2019

fix the flaky test in multi-joins with local shuffle reader
JkSelf
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Commits on Oct 23, 2019

update the comments
JkSelf
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polish the comment for why execute the OptimizaLocalShuffleReader rule twice and before ReduceNumShufflePartitions
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