类的使用
org.apache.iotdb.db.query.expression.Expression

使用Expression的程序包

程序包	说明
org.apache.iotdb.db.qp.logical.crud
org.apache.iotdb.db.qp.physical.crud
org.apache.iotdb.db.qp.utils
org.apache.iotdb.db.query.expression
org.apache.iotdb.db.query.expression.binary
org.apache.iotdb.db.query.expression.unary
org.apache.iotdb.db.query.udf.api.customizer.parameter
org.apache.iotdb.db.query.udf.core.executor
org.apache.iotdb.db.query.udf.core.layer

org.apache.iotdb.db.qp.logical.crud中Expression的使用

类型参数类型为Expression的org.apache.iotdb.db.qp.logical.crud中的字段

限定符和类型	字段和说明
protected List<Expression>	SpecialClauseComponent.withoutNullColumns

返回变量类型为Expression的类型的org.apache.iotdb.db.qp.logical.crud中的方法

限定符和类型	方法和说明
List<Expression>	SpecialClauseComponent.getWithoutNullColumns()

参数类型为Expression的org.apache.iotdb.db.qp.logical.crud中的方法

限定符和类型	方法和说明
void	SpecialClauseComponent.addWithoutNullColumn(Expression e)

类型变量类型为Expression的org.apache.iotdb.db.qp.logical.crud中的方法参数

限定符和类型	方法和说明
void	SpecialClauseComponent.setWithoutNullColumns(List<Expression> withoutNullColumns)

org.apache.iotdb.db.qp.physical.crud中Expression的使用

类型变量类型为Expression的org.apache.iotdb.db.qp.physical.crud中的方法参数

限定符和类型	方法和说明
void	AlignByDevicePlan.calcWithoutNullColumnIndex(List<Expression> withoutNullColumns)
void	UDAFPlan.setExpressionToInnerResultIndexMap(Map<Expression,Integer> expressionToInnerResultIndexMap)

org.apache.iotdb.db.qp.utils中Expression的使用

返回变量类型为Expression的类型的org.apache.iotdb.db.qp.utils中的方法

限定符和类型	方法和说明
List<List<Expression>>	WildcardsRemover.removeWildcardsFrom(List<Expression> expressions)

类型变量类型为Expression的org.apache.iotdb.db.qp.utils中的方法参数

限定符和类型	方法和说明
List<List<Expression>>	WildcardsRemover.removeWildcardsFrom(List<Expression> expressions)

org.apache.iotdb.db.query.expression中Expression的使用

返回Expression的org.apache.iotdb.db.query.expression中的方法

限定符和类型	方法和说明
Expression	ResultColumn.getExpression()

返回变量类型为Expression的类型的org.apache.iotdb.db.query.expression中的方法

限定符和类型	方法和说明
abstract List<Expression>	Expression.getExpressions() returns the DIRECT children expressions if it has any, otherwise an EMPTY list will be returned
Iterator<Expression>	Expression.iterator() returns an iterator to traverse all the successor expressions in a level-order

类型变量类型为Expression的org.apache.iotdb.db.query.expression中的方法参数

限定符和类型	方法和说明
abstract void	Expression.concat(List<PartialPath> prefixPaths, List<Expression> resultExpressions)
abstract IntermediateLayer	Expression.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
abstract IntermediateLayer	Expression.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
abstract void	Expression.removeWildcards(WildcardsRemover wildcardsRemover, List<Expression> resultExpressions)

参数类型为Expression的org.apache.iotdb.db.query.expression中的构造器

构造器和说明
ResultColumn(Expression expression)
ResultColumn(Expression expression, String alias)

org.apache.iotdb.db.query.expression.binary中Expression的使用

org.apache.iotdb.db.query.expression.binary中Expression的子类

限定符和类型	类和说明
class	AdditionExpression
class	BinaryExpression
class	DivisionExpression
class	ModuloExpression
class	MultiplicationExpression
class	SubtractionExpression

声明为Expression的org.apache.iotdb.db.query.expression.binary中的字段

限定符和类型	字段和说明
protected Expression	BinaryExpression.leftExpression
protected Expression	BinaryExpression.rightExpression

返回Expression的org.apache.iotdb.db.query.expression.binary中的方法

限定符和类型	方法和说明
Expression	BinaryExpression.getLeftExpression()
Expression	BinaryExpression.getRightExpression()

返回变量类型为Expression的类型的org.apache.iotdb.db.query.expression.binary中的方法

限定符和类型	方法和说明
List<Expression>	BinaryExpression.getExpressions()

类型变量类型为Expression的org.apache.iotdb.db.query.expression.binary中的方法参数

限定符和类型	方法和说明
void	BinaryExpression.concat(List<PartialPath> prefixPaths, List<Expression> resultExpressions)
IntermediateLayer	BinaryExpression.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
IntermediateLayer	BinaryExpression.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
void	BinaryExpression.removeWildcards(WildcardsRemover wildcardsRemover, List<Expression> resultExpressions)

参数类型为Expression的org.apache.iotdb.db.query.expression.binary中的构造器

构造器和说明
AdditionExpression(Expression leftExpression, Expression rightExpression)
BinaryExpression(Expression leftExpression, Expression rightExpression)
DivisionExpression(Expression leftExpression, Expression rightExpression)
ModuloExpression(Expression leftExpression, Expression rightExpression)
MultiplicationExpression(Expression leftExpression, Expression rightExpression)
SubtractionExpression(Expression leftExpression, Expression rightExpression)

org.apache.iotdb.db.query.expression.unary中Expression的使用

org.apache.iotdb.db.query.expression.unary中Expression的子类

限定符和类型	类和说明
class	ConstantOperand Constant operand
class	FunctionExpression
class	NegationExpression
class	TimeSeriesOperand

声明为Expression的org.apache.iotdb.db.query.expression.unary中的字段

限定符和类型	字段和说明
protected Expression	NegationExpression.expression

返回Expression的org.apache.iotdb.db.query.expression.unary中的方法

限定符和类型	方法和说明
Expression	NegationExpression.getExpression()

返回变量类型为Expression的类型的org.apache.iotdb.db.query.expression.unary中的方法

限定符和类型	方法和说明
List<Expression>	TimeSeriesOperand.getExpressions()
List<Expression>	NegationExpression.getExpressions()
List<Expression>	ConstantOperand.getExpressions()
List<Expression>	FunctionExpression.getExpressions()

参数类型为Expression的org.apache.iotdb.db.query.expression.unary中的方法

限定符和类型	方法和说明
void	FunctionExpression.addExpression(Expression expression)

类型变量类型为Expression的org.apache.iotdb.db.query.expression.unary中的方法参数

限定符和类型	方法和说明
void	TimeSeriesOperand.concat(List<PartialPath> prefixPaths, List<Expression> resultExpressions)
void	NegationExpression.concat(List<PartialPath> prefixPaths, List<Expression> resultExpressions)
void	ConstantOperand.concat(List<PartialPath> prefixPaths, List<Expression> resultExpressions)
void	FunctionExpression.concat(List<PartialPath> prefixPaths, List<Expression> resultExpressions)
IntermediateLayer	TimeSeriesOperand.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
IntermediateLayer	TimeSeriesOperand.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
IntermediateLayer	NegationExpression.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
IntermediateLayer	NegationExpression.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
IntermediateLayer	ConstantOperand.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
IntermediateLayer	ConstantOperand.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
IntermediateLayer	FunctionExpression.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
IntermediateLayer	FunctionExpression.constructIntermediateLayer(long queryId, UDTFPlan udtfPlan, RawQueryInputLayer rawTimeSeriesInputLayer, Map<Expression,IntermediateLayer> expressionIntermediateLayerMap, Map<Expression,TSDataType> expressionDataTypeMap, LayerMemoryAssigner memoryAssigner)
void	TimeSeriesOperand.removeWildcards(WildcardsRemover wildcardsRemover, List<Expression> resultExpressions)
void	NegationExpression.removeWildcards(WildcardsRemover wildcardsRemover, List<Expression> resultExpressions)
void	ConstantOperand.removeWildcards(WildcardsRemover wildcardsRemover, List<Expression> resultExpressions)
void	FunctionExpression.removeWildcards(WildcardsRemover wildcardsRemover, List<Expression> resultExpressions)
void	FunctionExpression.setExpressions(List<Expression> expressions)

参数类型为Expression的org.apache.iotdb.db.query.expression.unary中的构造器

构造器和说明
NegationExpression(Expression expression)

类型变量类型为Expression的org.apache.iotdb.db.query.expression.unary中的构造器参数

构造器和说明
FunctionExpression(String functionName, Map<String,String> functionAttributes, List<Expression> expressions)

org.apache.iotdb.db.query.udf.api.customizer.parameter中Expression的使用

返回变量类型为Expression的类型的org.apache.iotdb.db.query.udf.api.customizer.parameter中的方法

限定符和类型	方法和说明
List<Expression>	UDFParameters.getExpressions()

类型变量类型为Expression的org.apache.iotdb.db.query.udf.api.customizer.parameter中的构造器参数

构造器和说明
UDFParameters(FunctionExpression functionExpression, Map<Expression,TSDataType> expressionDataTypeMap)

org.apache.iotdb.db.query.udf.core.executor中Expression的使用

类型变量类型为Expression的org.apache.iotdb.db.query.udf.core.executor中的方法参数

限定符和类型	方法和说明
void	UDTFExecutor.beforeStart(long queryId, float collectorMemoryBudgetInMB, Map<Expression,TSDataType> expressionDataTypeMap)

org.apache.iotdb.db.query.udf.core.layer中Expression的使用

声明为Expression的org.apache.iotdb.db.query.udf.core.layer中的字段

限定符和类型	字段和说明
protected Expression	IntermediateLayer.expression

参数类型为Expression的org.apache.iotdb.db.query.udf.core.layer中的方法

限定符和类型	方法和说明
int	LayerMemoryAssigner.getReference(Expression expression)
void	LayerMemoryAssigner.increaseExpressionReference(Expression expression)

参数类型为Expression的org.apache.iotdb.db.query.udf.core.layer中的构造器

构造器和说明
IntermediateLayer(Expression expression, long queryId, float memoryBudgetInMB)
MultiInputColumnIntermediateLayer(Expression expression, long queryId, float memoryBudgetInMB, List<LayerPointReader> parentLayerPointReaders)
SingleInputColumnMultiReferenceIntermediateLayer(Expression expression, long queryId, float memoryBudgetInMB, LayerPointReader parentLayerPointReader)
SingleInputColumnSingleReferenceIntermediateLayer(Expression expression, long queryId, float memoryBudgetInMB, LayerPointReader parentLayerPointReader)