Class ExpressionOptimizer
- java.lang.Object
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- org.apache.iotdb.tsfile.read.expression.util.ExpressionOptimizer
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public class ExpressionOptimizer extends java.lang.Object
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description static ExpressionOptimizergetInstance()IExpressionoptimize(IExpression expression, java.util.List<Path> selectedSeries)try to remove GlobalTimeExpression.
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Method Detail
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getInstance
public static ExpressionOptimizer getInstance()
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optimize
public IExpression optimize(IExpression expression, java.util.List<Path> selectedSeries) throws QueryFilterOptimizationException
try to remove GlobalTimeExpression.- Parameters:
expression- IExpression to be transferredselectedSeries- selected series- Returns:
- an executable query filter, whether a GlobalTimeExpression or All leaf nodes are SingleSeriesExpression
- Throws:
QueryFilterOptimizationException
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