QueryStage 
    class QueryStage
Stage statistics such as input and output rows and bytes, execution time and stage state. This information also includes substages and the query stage plan.
Types
Properties
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                  Time taken to execute this stage.
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                  The number of bytes input into the stage for execution.
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                  The number of bytes output from the stage after execution.
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                  The number of rows output from the stage after execution.
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                  Stage plan information such as name, identifier, sub plans, and source stages.
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                  List of sub query stages that form this stage execution plan.