public abstract class StringAggregateFunction extends AggregateFunction<StringColumn,String>
Constructor | Description |
---|---|
StringAggregateFunction(String name) |
Constructs an
StringFunction with the given name. |
Modifier and Type | Method | Description |
---|---|---|
boolean |
isCompatibleColumn(ColumnType type) |
Returns true if the given
ColumnType is compatible with this function |
ColumnType |
returnType() |
Returns the
ColumnType to be used for the values returned by this function |
abstract String |
summarize(StringColumn column) |
Apply this function to the column argument
|
functionName, toString
public StringAggregateFunction(String name)
StringFunction
with the given name. The name may be used to name a column
in the output when this function is used by Summarizer
public abstract String summarize(StringColumn column)
AggregateFunction
summarize
in class AggregateFunction<StringColumn,String>
public boolean isCompatibleColumn(ColumnType type)
ColumnType
is compatible with this functionisCompatibleColumn
in class AggregateFunction<StringColumn,String>
public ColumnType returnType()
ColumnType
to be used for the values returned by this functionreturnType
in class AggregateFunction<StringColumn,String>
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