spark技术分享SizeInBytesOnlyStatsPlanVisitor — LogicalPlanVisitor for Total Size (in Bytes) Statistic Only
SizeInBytesOnlyStatsPlanVisitor is a LogicalPlanVisitor that computes a single dimension for plan statistics, i.e. the total size (in bytes).
default Method
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default(p: LogicalPlan): Statistics |
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Note
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default is part of LogicalPlanVisitor Contract to compute the size statistic (in bytes) of a logical operator.
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default requests a leaf logical operator for the statistics or creates a Statistics with the product of the sizeInBytes statistic of every child operator.
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Note
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default uses the cache of the estimated statistics of a logical operator so the statistics of an operator is computed once until it is invalidated.
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visitIntersect Method
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visitIntersect(p: Intersect): Statistics |
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Note
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visitIntersect is part of LogicalPlanVisitor Contract to…FIXME.
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visitIntersect…FIXME
visitJoin Method
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visitJoin(p: Join): Statistics |
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Note
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visitJoin is part of LogicalPlanVisitor Contract to…FIXME.
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visitJoin…FIXME
