org.apache.flink.table.planner.functions.aggfunctions

Class IncrSumWithRetractAggFunction

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

org.apache.flink.table.planner.functions.aggfunctions.DeclarativeAggregateFunction

org.apache.flink.table.planner.functions.aggfunctions.IncrSumWithRetractAggFunction

All Implemented Interfaces:

Serializable, FunctionDefinition

Direct Known Subclasses:

IncrSumWithRetractAggFunction.ByteIncrSumWithRetractAggFunction, IncrSumWithRetractAggFunction.DecimalIncrSumWithRetractAggFunction, IncrSumWithRetractAggFunction.DoubleIncrSumWithRetractAggFunction, IncrSumWithRetractAggFunction.FloatIncrSumWithRetractAggFunction, IncrSumWithRetractAggFunction.IntIncrSumWithRetractAggFunction, IncrSumWithRetractAggFunction.LongIncrSumWithRetractAggFunction, IncrSumWithRetractAggFunction.ShortIncrSumWithRetractAggFunction

public abstract class IncrSumWithRetractAggFunction
extends DeclarativeAggregateFunction

built-in IncrSum with retract aggregate function, negative number is discarded to ensure the monotonicity.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	IncrSumWithRetractAggFunction.ByteIncrSumWithRetractAggFunction Built-in Byte IncrSum with retract aggregate function.
static class	IncrSumWithRetractAggFunction.DecimalIncrSumWithRetractAggFunction Built-in Decimal IncrSum with retract aggregate function.
static class	IncrSumWithRetractAggFunction.DoubleIncrSumWithRetractAggFunction Built-in Double IncrSum with retract aggregate function.
static class	IncrSumWithRetractAggFunction.FloatIncrSumWithRetractAggFunction Built-in Float IncrSum with retract aggregate function.
static class	IncrSumWithRetractAggFunction.IntIncrSumWithRetractAggFunction Built-in IncrInt Sum with retract aggregate function.
static class	IncrSumWithRetractAggFunction.LongIncrSumWithRetractAggFunction Built-in Long IncrSum with retract aggregate function.
static class	IncrSumWithRetractAggFunction.ShortIncrSumWithRetractAggFunction Built-in Short IncrSum with retract aggregate function.

Constructor Summary

Constructors

Constructor and Description
IncrSumWithRetractAggFunction()

Method Summary

Modifier and Type	Method and Description
Expression[]	accumulateExpressions() Expressions for accumulating the mutable aggregation buffer based on an input row.
UnresolvedReferenceExpression[]	aggBufferAttributes() All fields of the aggregate buffer.
DataType[]	getAggBufferTypes() All types of the aggregate buffer.
Expression	getValueExpression() An expression which returns the final value for this aggregate function.
Expression[]	initialValuesExpressions() Expressions for initializing empty aggregation buffers.
Expression[]	mergeExpressions() A sequence of expressions for merging two aggregation buffers together.
int	operandCount() How many operands your function will deal with.
Expression[]	retractExpressions() Expressions for retracting the mutable aggregation buffer based on an input row.
protected abstract Expression	zeroLiteral()

Methods inherited from class org.apache.flink.table.planner.functions.aggfunctions.DeclarativeAggregateFunction

getKind, getResultType, getTypeInference, mergeOperand, mergeOperands, operand, operands

Methods inherited from class org.apache.flink.table.functions.UserDefinedFunction

close, functionIdentifier, open, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.flink.table.functions.FunctionDefinition

getRequirements, isDeterministic

Constructor Detail

IncrSumWithRetractAggFunction

public IncrSumWithRetractAggFunction()

Method Detail

operandCount

public int operandCount()

Description copied from class: DeclarativeAggregateFunction

How many operands your function will deal with.

Specified by:

operandCount in class DeclarativeAggregateFunction

aggBufferAttributes

public UnresolvedReferenceExpression[] aggBufferAttributes()

Description copied from class: DeclarativeAggregateFunction

All fields of the aggregate buffer.

Specified by:

aggBufferAttributes in class DeclarativeAggregateFunction

getAggBufferTypes

public DataType[] getAggBufferTypes()

Description copied from class: DeclarativeAggregateFunction

All types of the aggregate buffer.

Specified by:

getAggBufferTypes in class DeclarativeAggregateFunction

initialValuesExpressions

public Expression[] initialValuesExpressions()

Description copied from class: DeclarativeAggregateFunction

Expressions for initializing empty aggregation buffers.

Specified by:

initialValuesExpressions in class DeclarativeAggregateFunction

accumulateExpressions

public Expression[] accumulateExpressions()

Description copied from class: DeclarativeAggregateFunction

Expressions for accumulating the mutable aggregation buffer based on an input row.

Specified by:

accumulateExpressions in class DeclarativeAggregateFunction

retractExpressions

public Expression[] retractExpressions()

Description copied from class: DeclarativeAggregateFunction

Expressions for retracting the mutable aggregation buffer based on an input row.

Specified by:

retractExpressions in class DeclarativeAggregateFunction

mergeExpressions

public Expression[] mergeExpressions()

Description copied from class: DeclarativeAggregateFunction

A sequence of expressions for merging two aggregation buffers together. When defining these expressions, you can use the syntax attributeName and mergeOperand(attributeName) to refer to the attributes corresponding to each of the buffers being merged.

Specified by:

mergeExpressions in class DeclarativeAggregateFunction

getValueExpression

public Expression getValueExpression()

Description copied from class: DeclarativeAggregateFunction

An expression which returns the final value for this aggregate function.

Specified by:

getValueExpression in class DeclarativeAggregateFunction

zeroLiteral

protected abstract Expression zeroLiteral()