Add push-down test for greatest and least#133

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JmPotato wants to merge 2 commits intotikv:masterfrom JmPotato:patch-1

+2

Commits on May 21, 2020

Add greatest and least
JmPotato
committed

Commits on Aug 24, 2020

Merge branch 'master' into patch-1
JmPotato
authored