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

Class AvgAggFunction

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

org.apache.flink.table.functions.DeclarativeAggregateFunction

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

All Implemented Interfaces:

Serializable, org.apache.flink.table.functions.FunctionDefinition

Direct Known Subclasses:

AvgAggFunction.ByteAvgAggFunction, AvgAggFunction.DecimalAvgAggFunction, AvgAggFunction.DoubleAvgAggFunction, AvgAggFunction.FloatAvgAggFunction, AvgAggFunction.IntAvgAggFunction, AvgAggFunction.LongAvgAggFunction, AvgAggFunction.ShortAvgAggFunction

public abstract class AvgAggFunction
extends org.apache.flink.table.functions.DeclarativeAggregateFunction

built-in avg aggregate function.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AvgAggFunction.ByteAvgAggFunction Built-in Byte Avg aggregate function.
static class	AvgAggFunction.DecimalAvgAggFunction Built-in Decimal Avg aggregate function.
static class	AvgAggFunction.DoubleAvgAggFunction Built-in Double Avg aggregate function.
static class	AvgAggFunction.FloatAvgAggFunction Built-in Float Avg aggregate function.
static class	AvgAggFunction.IntAvgAggFunction Built-in Integer Avg aggregate function.
static class	AvgAggFunction.LongAvgAggFunction Built-in Long Avg aggregate function.
static class	AvgAggFunction.ShortAvgAggFunction Built-in Short Avg aggregate function.

Constructor Summary

Constructors

Constructor and Description
AvgAggFunction()

Method Summary

Modifier and Type	Method and Description
org.apache.flink.table.expressions.Expression[]	accumulateExpressions()
protected org.apache.flink.table.expressions.UnresolvedCallExpression	adjustedMinus(org.apache.flink.table.expressions.UnresolvedReferenceExpression arg1, org.apache.flink.table.expressions.UnresolvedReferenceExpression arg2)
protected org.apache.flink.table.expressions.UnresolvedCallExpression	adjustedPlus(org.apache.flink.table.expressions.UnresolvedReferenceExpression arg1, org.apache.flink.table.expressions.UnresolvedReferenceExpression arg2)
org.apache.flink.table.expressions.UnresolvedReferenceExpression[]	aggBufferAttributes()
org.apache.flink.table.types.DataType[]	getAggBufferTypes()
abstract org.apache.flink.table.types.DataType	getSumType()
org.apache.flink.table.expressions.Expression	getValueExpression() If all input are nulls, count will be 0 and we will get null after the division.
org.apache.flink.table.expressions.Expression[]	initialValuesExpressions()
org.apache.flink.table.expressions.Expression[]	mergeExpressions()
int	operandCount()
org.apache.flink.table.expressions.Expression[]	retractExpressions()

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

AvgAggFunction

public AvgAggFunction()

Method Detail

getSumType

public abstract org.apache.flink.table.types.DataType getSumType()

operandCount

public int operandCount()

Specified by:

operandCount in class org.apache.flink.table.functions.DeclarativeAggregateFunction

aggBufferAttributes

public org.apache.flink.table.expressions.UnresolvedReferenceExpression[] aggBufferAttributes()

Specified by:

aggBufferAttributes in class org.apache.flink.table.functions.DeclarativeAggregateFunction

getAggBufferTypes

public org.apache.flink.table.types.DataType[] getAggBufferTypes()

Specified by:

getAggBufferTypes in class org.apache.flink.table.functions.DeclarativeAggregateFunction

initialValuesExpressions

public org.apache.flink.table.expressions.Expression[] initialValuesExpressions()

Specified by:

initialValuesExpressions in class org.apache.flink.table.functions.DeclarativeAggregateFunction

accumulateExpressions

public org.apache.flink.table.expressions.Expression[] accumulateExpressions()

Specified by:

accumulateExpressions in class org.apache.flink.table.functions.DeclarativeAggregateFunction

retractExpressions

public org.apache.flink.table.expressions.Expression[] retractExpressions()

Specified by:

retractExpressions in class org.apache.flink.table.functions.DeclarativeAggregateFunction

mergeExpressions

public org.apache.flink.table.expressions.Expression[] mergeExpressions()

Specified by:

mergeExpressions in class org.apache.flink.table.functions.DeclarativeAggregateFunction

getValueExpression

public org.apache.flink.table.expressions.Expression getValueExpression()

If all input are nulls, count will be 0 and we will get null after the division.

Specified by:

getValueExpression in class org.apache.flink.table.functions.DeclarativeAggregateFunction

adjustedPlus

protected org.apache.flink.table.expressions.UnresolvedCallExpression adjustedPlus(org.apache.flink.table.expressions.UnresolvedReferenceExpression arg1,
                                                                                   org.apache.flink.table.expressions.UnresolvedReferenceExpression arg2)

adjustedMinus

protected org.apache.flink.table.expressions.UnresolvedCallExpression adjustedMinus(org.apache.flink.table.expressions.UnresolvedReferenceExpression arg1,
                                                                                    org.apache.flink.table.expressions.UnresolvedReferenceExpression arg2)