DenseRankAggFunction (Flink : 2.0-SNAPSHOT API)

java.lang.Object
- org.apache.flink.table.functions.UserDefinedFunction
- - org.apache.flink.table.functions.DeclarativeAggregateFunction
  - - org.apache.flink.table.planner.functions.aggfunctions.RankLikeAggFunctionBase
    - - org.apache.flink.table.planner.functions.aggfunctions.DenseRankAggFunction

All Implemented Interfaces:

Serializable, FunctionDefinition
```
public class DenseRankAggFunction
extends RankLikeAggFunctionBase
```
built-in dense_rank aggregate function.

See Also:

Serialized Form

Field Summary
- Fields inherited from class org.apache.flink.table.planner.functions.aggfunctions.RankLikeAggFunctionBase
  lastValues, orderKeyTypes, sequence

Constructor Summary

Constructors
Constructor Description

DenseRankAggFunction(LogicalType[] orderKeyTypes)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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[]`	`initialValuesExpressions()`	Expressions for initializing empty aggregation buffers.

Methods inherited from class org.apache.flink.table.planner.functions.aggfunctions.RankLikeAggFunctionBase
generateInitLiteral, getResultType, getValueExpression, mergeExpressions, operandCount, orderKeyEqualsExpression, retractExpressions

Methods inherited from class org.apache.flink.table.functions.DeclarativeAggregateFunction
getKind, 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, supportsConstantFolding

- Constructor Detail
  - DenseRankAggFunction
```
public DenseRankAggFunction(LogicalType[] orderKeyTypes)
```
- Method Detail
  - 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