[SPARK-12032] [SQL] Joinorder adjustment#10258

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flyson wants to merge 4 commits intoapache:masterfrom

flyson:joinorder

Commits on Dec 2, 2015

Extract the common equality conditions that can be used as a join condition
Min Qiu
committed

Commits on Dec 3, 2015

bug fix for ColumnPruning rule to deal with Project <- Filter <- Join case
Min Qiu
committed
bug fix for ColumnPruning rule to deal with Project <- Filter <- Join case
Min Qiu
committed

Commits on Dec 10, 2015

a new rule for adjusting the join order
Min Qiu
committed