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Exchange Unary Physical Operators

Exchange is an extension of the UnaryExecNode abstraction for unary physical operators to exchange data (among tasks).

Adaptive Query Execution

Exchange operators are target of Adaptive Query Execution.


Output Attributes

output: Seq[Attribute]

output is part of the QueryPlan abstraction.

output requests the child operator for the output attributes.


stringArgs: Iterator[Any]

stringArgs is part of the TreeNode abstraction.

stringArgs adds [id=#[id]] to the default stringArgs.