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5984c0be52
- created new class PlanFragment, which encapsulates everything having to do with a single plan fragment, including its partition, output exprs, destination node, etc. - created new class DataPartition - explicit classes for fragment and plan node ids, to avoid getting them mixed up, which is easy to do with ints - Adding IdGenerator class. - moved PlanNode.ExplainPlanLevel to Types.thrift, so it can also be used for PlanFragment.getExplainString() - Changed planner interface to return scan ranges with a complete list of server locations, instead of making a server assignment. Also included: cleaned up AggregateInfo: - the 2nd phase of a DISTINCT aggregation is now captured separately from a merge aggregation. - moved analysis functionality into AggregateInfo Removing broken test cases from workload functional-planner (they're being handled correctly in functional-newplanner).