Typo in testdb path for example.
Refactor Expand + OptionalExpand to use QueryPlan
Refactor Projection (along with Skip, Limit, Sort, SortedLimit)  to use QueryPlan
Refactor Join  to use QueryPlan
Refactor CartesianProduct  to use QueryPlan
Refactor Optional  to use QueryPlan
Refactor remaining Apply variants and OuterHashJoin to use QueryPlan
Add Visitor support for Query{Plan, Graph} and removed coveredIds from LogicalPlanStringVisitor
Remove coveredIds from LogicalPlan
Remove solved from LogicalPlan
Merge pull request #2370 from boggle/externalized-qg

Externalized qg
Fix up the merge conflict resolution
Merge pull request #2366 from systay/merge-fixup

Merge 2.0-maint into 2.1-master
Remove the QueryPlan factories from projection plans
Add availableSymbols back to logical plans
Removed uses of coveredIds
Merge pull request #2372 from jakub-/queryplan

QueryPlan refactorings
Add grouping key to QueryGraph and enabling it in QueryGraphBuilder