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

Class Sum0AggFunction

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

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

org.apache.flink.table.planner.functions.aggfunctions.Sum0AggFunction

All Implemented Interfaces:

Serializable, FunctionDefinition

Direct Known Subclasses:

Sum0AggFunction.ByteSum0AggFunction, Sum0AggFunction.DecimalSum0AggFunction, Sum0AggFunction.DoubleSum0AggFunction, Sum0AggFunction.FloatSum0AggFunction, Sum0AggFunction.IntSum0AggFunction, Sum0AggFunction.LongSum0AggFunction, Sum0AggFunction.ShortSum0AggFunction

public abstract class Sum0AggFunction
extends DeclarativeAggregateFunction

built-in sum0 aggregate function.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Sum0AggFunction.ByteSum0AggFunction Built-in Byte Sum0 aggregate function.
static class	Sum0AggFunction.DecimalSum0AggFunction Built-in Decimal Sum0 aggregate function.
static class	Sum0AggFunction.DoubleSum0AggFunction Built-in Double Sum0 aggregate function.
static class	Sum0AggFunction.FloatSum0AggFunction Built-in Float Sum0 aggregate function.
static class	Sum0AggFunction.IntSum0AggFunction Built-in Int Sum0 aggregate function.
static class	Sum0AggFunction.LongSum0AggFunction Built-in Long Sum0 aggregate function.
static class	Sum0AggFunction.ShortSum0AggFunction Built-in Short Sum0 aggregate function.

Constructor Summary

Constructors

Constructor and Description
Sum0AggFunction()

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[]	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.

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

getKind, getResultType, initialValuesExpressions, 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

Sum0AggFunction

public Sum0AggFunction()

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

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