SubqueryExec Unary Physical Operator

SubqueryExec is…​FIXME

doPrepare Method

doPrepare(): Unit
doPrepare is a part of SparkPlan Contract to prepare a physical operator for execution.

doPrepare triggers initialization of the internal lazily-initialized asynchronous computation that…​FIXME

relationFuture Internal Lazily-Initialized Property

relationFuture: Future[Array[InternalRow]]
FIXME See BroadcastExchangeExec.relationFuture

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