Sync with apache/spark#11

Merged

vofque merged 2 commits intovofque:branch-2.2from

apache:branch-2.2

Oct 18, 2018

Commits on Oct 14, 2018

[SPARK-25726][SQL][TEST] Fix flaky test in SaveIntoDataSourceCommandSuite
dongjoon-hyun
committed

Commits on Oct 16, 2018

[SPARK-25714][BACKPORT-2.2] Fix Null Handling in the Optimizer rule BooleanSimplification

gatorsmile
authored and
cloud-fan
committed