@InterfaceAudience.Public @InterfaceStability.Stable public class UniqValueCount extends Object implements ValueAggregator<Object>
| Modifier and Type | Field and Description |
|---|---|
static String |
MAX_NUM_UNIQUE_VALUES |
| Constructor and Description |
|---|
UniqValueCount()
the default constructor
|
UniqValueCount(long maxNum)
constructor
|
| Modifier and Type | Method and Description |
|---|---|
void |
addNextValue(Object val)
add a value to the aggregator
|
ArrayList<Object> |
getCombinerOutput() |
String |
getReport() |
Set<Object> |
getUniqueItems() |
void |
reset()
reset the aggregator
|
long |
setMaxItems(long n)
Set the limit on the number of unique values
|
public static final String MAX_NUM_UNIQUE_VALUES
public UniqValueCount()
public UniqValueCount(long maxNum)
maxNum - the limit in the number of unique values to keep.public long setMaxItems(long n)
n - the desired limit on the number of unique valuespublic void addNextValue(Object val)
addNextValue in interface ValueAggregator<Object>val - an object.public String getReport()
getReport in interface ValueAggregator<Object>public void reset()
reset in interface ValueAggregator<Object>public ArrayList<Object> getCombinerOutput()
getCombinerOutput in interface ValueAggregator<Object>Copyright © 2022 Apache Software Foundation. All rights reserved.