SERVER-25957 Optimize $filter + $arrayElemAt to avoid scanning entire array#1236

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KevinCybura wants to merge 8 commits intomongodb:masterfrom

KevinCybura:optimizeFilter

Commits on Apr 20, 2018

Commits on Apr 25, 2018

Commits on Apr 26, 2018

optimizeFilter 04/26/2018: ready for pull request
KevinCybura
committed

Commits on Apr 27, 2018

optimizeFilter 04/27/2018: requested changes made
KevinCybura
committed

Commits on May 1, 2018

optimizeFilter 05/1/2018: added ExpressionNary optimize and unittests for it
KevinCybura
committed

Commits on May 4, 2018

optimizeFilter: final changes
KevinCybura
committed