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

Class FirstValueWithRetractAggFunction.StringFirstValueWithRetractAggFunction

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

org.apache.flink.table.functions.UserDefinedAggregateFunction<T,ACC>

org.apache.flink.table.functions.AggregateFunction<T,GenericRowData>

org.apache.flink.table.planner.functions.aggfunctions.FirstValueWithRetractAggFunction<StringData>

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

All Implemented Interfaces:

Serializable, FunctionDefinition

Enclosing class:

FirstValueWithRetractAggFunction<T>

public static class FirstValueWithRetractAggFunction.StringFirstValueWithRetractAggFunction
extends FirstValueWithRetractAggFunction<StringData>

Built-in String FirstValue with retract aggregate function.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.table.planner.functions.aggfunctions.FirstValueWithRetractAggFunction

FirstValueWithRetractAggFunction.BooleanFirstValueWithRetractAggFunction, FirstValueWithRetractAggFunction.ByteFirstValueWithRetractAggFunction, FirstValueWithRetractAggFunction.DecimalFirstValueWithRetractAggFunction, FirstValueWithRetractAggFunction.DoubleFirstValueWithRetractAggFunction, FirstValueWithRetractAggFunction.FloatFirstValueWithRetractAggFunction, FirstValueWithRetractAggFunction.IntFirstValueWithRetractAggFunction, FirstValueWithRetractAggFunction.LongFirstValueWithRetractAggFunction, FirstValueWithRetractAggFunction.ShortFirstValueWithRetractAggFunction, FirstValueWithRetractAggFunction.StringFirstValueWithRetractAggFunction

Constructor Summary

Constructors

Constructor and Description
StringFirstValueWithRetractAggFunction()

Method Summary

Modifier and Type	Method and Description
void	accumulate(GenericRowData acc, StringData value)
void	accumulate(GenericRowData acc, StringData value, Long order)
protected TypeSerializer<StringData>	createValueSerializer()
TypeInformation<StringData>	getResultType() Returns the TypeInformation of the UserDefinedAggregateFunction's result.

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

accumulate, accumulate, createAccumulator, getAccumulatorType, getValue, resetAccumulator, retract, retract

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

getKind, getRequirements, getTypeInference, requiresOver

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

isDeterministic

Constructor Detail

StringFirstValueWithRetractAggFunction

public StringFirstValueWithRetractAggFunction()

Method Detail

getResultType

public TypeInformation<StringData> getResultType()

Description copied from class: UserDefinedAggregateFunction

Returns the TypeInformation of the UserDefinedAggregateFunction's result.

Overrides:

getResultType in class UserDefinedAggregateFunction<StringData,GenericRowData>

Returns:

The TypeInformation of the UserDefinedAggregateFunction's result or null if the result type should be automatically inferred.

accumulate

public void accumulate(GenericRowData acc,
                       StringData value)
                throws Exception

Throws:

Exception

accumulate

public void accumulate(GenericRowData acc,
                       StringData value,
                       Long order)
                throws Exception

Throws:

Exception

createValueSerializer

protected TypeSerializer<StringData> createValueSerializer()

Specified by:

createValueSerializer in class FirstValueWithRetractAggFunction<StringData>