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

Class SumWithRetractAggFunction

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

org.apache.flink.table.functions.DeclarativeAggregateFunction

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

All Implemented Interfaces:

Serializable, FunctionDefinition

Direct Known Subclasses:

SumWithRetractAggFunction.ByteSumWithRetractAggFunction, SumWithRetractAggFunction.DecimalSumWithRetractAggFunction, SumWithRetractAggFunction.DoubleSumWithRetractAggFunction, SumWithRetractAggFunction.FloatSumWithRetractAggFunction, SumWithRetractAggFunction.IntSumWithRetractAggFunction, SumWithRetractAggFunction.LongSumWithRetractAggFunction, SumWithRetractAggFunction.ShortSumWithRetractAggFunction

public abstract class SumWithRetractAggFunction
extends DeclarativeAggregateFunction

built-in sum aggregate function with retraction.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SumWithRetractAggFunction.ByteSumWithRetractAggFunction Built-in Byte Sum with retract aggregate function.
static class	SumWithRetractAggFunction.DecimalSumWithRetractAggFunction Built-in Decimal Sum with retract aggregate function.
static class	SumWithRetractAggFunction.DoubleSumWithRetractAggFunction Built-in Double Sum with retract aggregate function.
static class	SumWithRetractAggFunction.FloatSumWithRetractAggFunction Built-in Float Sum with retract aggregate function.
static class	SumWithRetractAggFunction.IntSumWithRetractAggFunction Built-in Int Sum with retract aggregate function.
static class	SumWithRetractAggFunction.LongSumWithRetractAggFunction Built-in Long Sum with retract aggregate function.
static class	SumWithRetractAggFunction.ShortSumWithRetractAggFunction Built-in Short Sum with retract aggregate function.

Constructor Summary

Constructors

Constructor and Description
SumWithRetractAggFunction()

Method Summary

Modifier and Type	Method and Description
Expression[]	accumulateExpressions() Expressions for accumulating the mutable aggregation buffer based on an input row.
protected UnresolvedCallExpression	adjustedMinus(Expression arg1, UnresolvedReferenceExpression arg2)
protected UnresolvedCallExpression	adjustedPlus(UnresolvedReferenceExpression arg1, UnresolvedReferenceExpression arg2)
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.functions.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

SumWithRetractAggFunction

public SumWithRetractAggFunction()

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()

adjustedPlus

protected UnresolvedCallExpression adjustedPlus(UnresolvedReferenceExpression arg1,
                                                UnresolvedReferenceExpression arg2)

adjustedMinus

protected UnresolvedCallExpression adjustedMinus(Expression arg1,
                                                 UnresolvedReferenceExpression arg2)