[SPARK-26142][SQL] Implement shuffle read metrics in SQL#23128

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Commits on Nov 27, 2018

[SPARK-26142] Implement shuffle read metric in SQL

liyuanjian
authored and
xuanyuanking
committed
Fix performance regression and more comments

liyuanjian
authored and
xuanyuanking
committed
Address comments
xuanyuanking
committed

Commits on Nov 28, 2018