Refactor QueryCache to QueryPlanCache#3345
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sougou merged 2 commits intovitessio:masterfrom Nov 4, 2017
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* To be more accurate, this commit refactors QueryCache to QueryPlanCache * It also renames queries to plans. This is consistent with the naming in vtgate * TODO - Refactor published metrics. This will be done in a separate commit
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In this PR #3245, @bbeaudreault suggested we should refactor
QueryCachetoPlanCache. This PR takes a first stab at doing that.