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* MSQ: Add QueryKitSpec to encapsulate QueryKit params. This patch introduces QueryKitSpec, an object that encapsulates the parameters to makeQueryDefinition that are consistent from call to call. This simplifies things because we avoid passing around all the components individually. This patch also splits "maxWorkerCount" into "maxLeafWorkerCount" and "maxNonLeafWorkerCount", which apply to leaf stages (no other stages as inputs) and nonleaf stages respectively. Finally, this patch also rovides a way for ControllerContext to supply a QueryKitSpec to its liking. It is expected that this will be used by controllers of quick interactive queries to set maxNonLeafWorkerCount = 1, which will generate fanning-in query plans. * Fix javadoc.