public static class StatsRulesProcFactory.SelectStatsRule extends StatsRulesProcFactory.DefaultStatsRule implements NodeProcessor
JavaDataModel
will be used and for variable length data
types worst case will be assumed.
For more information, refer 'Estimating The Cost Of Operations' chapter in "Database Systems: The Complete Book" by Garcia-Molina et. al.
Constructor and Description |
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SelectStatsRule() |
Modifier and Type | Method and Description |
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Object |
process(Node nd,
Stack<Node> stack,
NodeProcessorCtx procCtx,
Object... nodeOutputs)
Generic process for all ops that don't have specific implementations.
|
public Object process(Node nd, Stack<Node> stack, NodeProcessorCtx procCtx, Object... nodeOutputs) throws SemanticException
NodeProcessor
process
in interface NodeProcessor
process
in class StatsRulesProcFactory.DefaultStatsRule
nd
- operator to processprocCtx
- operator processor contextnodeOutputs
- A variable argument list of outputs from other nodes in the walkSemanticException
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