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## cascading.pipe.assembly
Class CountBy

    java.lang.Object
      cascading.pipe.Pipe
          cascading.pipe.SubAssembly
              cascading.pipe.assembly.AggregateBy
                  cascading.pipe.assembly.CountBy

All Implemented Interfaces:
  FlowElement, Serializable

    public class CountBy

extends AggregateBy

Class CountBy is used to count duplicates in a tuple stream.

Typically finding the count of a field in a tuple stream relies on a `GroupBy` and a `Count` `Aggregator` operation.

If `include` is `CountBy.Include.NO_NULLS`, argument tuples with all null values will be ignored. When counting the occurrence of a single field (when `valueFields` is set on the constructor), this is the same behavior as `select count(foo) ...` in SQL. If `include` is `CountBy.Include.ONLY_NULLS` then only tuples will all null values will be counted.

This SubAssembly also uses the `CountBy.CountPartials` `AggregateBy.Functor` to count field values before the GroupBy operator to reduce IO over the network.

This strategy is similar to using `combiners`, except no sorting or serialization is invoked and results in a much simpler mechanism.

The `threshold` value tells the underlying CountPartials functions how many unique key counts to accumulate in the LRU cache, before emitting the least recently used entry.

By default, either the value of `AggregateBy.AGGREGATE_BY_THRESHOLD` System property or `AggregateBy.DEFAULT_THRESHOLD` will be used.

See Also:
  `AggregateBy`, Serialized Form

Nested Class Summary
`static class` | `CountBy.CountPartials` Class CountPartials is a `AggregateBy.Functor` that is used to count observed duplicates from the tuple stream.
`static class` | `CountBy.Include`

Nested classes/interfaces inherited from class cascading.pipe.assembly.AggregateBy
`AggregateBy.CompositeFunction, AggregateBy.Flush, AggregateBy.Functor`

Field Summary
`static int` | `DEFAULT_THRESHOLD` Deprecated.

Fields inherited from class cascading.pipe.assembly.AggregateBy
`AGGREGATE_BY_THRESHOLD, USE_DEFAULT_THRESHOLD`

Fields inherited from class cascading.pipe.Pipe
`configDef, parent, stepConfigDef`

Constructor Summary
`CountBy(Fields countField)` Constructor CountBy creates a new CountBy instance.
`CountBy(Fields countField, CountBy.Include include)` Constructor CountBy creates a new CountBy instance.
`CountBy(Fields valueFields, Fields countField)` Constructor CountBy creates a new CountBy instance.
`CountBy(Fields valueFields, Fields countField, CountBy.Include include)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe[] pipes, Fields groupingFields, Fields countField)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe[] pipes, Fields groupingFields, Fields countField, CountBy.Include include)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe[] pipes, Fields groupingFields, Fields countField, CountBy.Include include, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe[] pipes, Fields groupingFields, Fields valueFields, Fields countField)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe[] pipes, Fields groupingFields, Fields valueFields, Fields countField, CountBy.Include include)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe[] pipes, Fields groupingFields, Fields valueFields, Fields countField, CountBy.Include include, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe[] pipes, Fields groupingFields, Fields valueFields, Fields countField, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe[] pipes, Fields groupingFields, Fields countField, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe pipe, Fields groupingFields, Fields countField)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe pipe, Fields groupingFields, Fields countField, CountBy.Include include)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe pipe, Fields groupingFields, Fields countField, CountBy.Include include, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe pipe, Fields groupingFields, Fields valueFields, Fields countField)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe pipe, Fields groupingFields, Fields valueFields, Fields countField, CountBy.Include include)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe pipe, Fields groupingFields, Fields valueFields, Fields countField, CountBy.Include include, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe pipe, Fields groupingFields, Fields valueFields, Fields countField, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(Pipe pipe, Fields groupingFields, Fields countField, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe[] pipes, Fields groupingFields, Fields countField)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe[] pipes, Fields groupingFields, Fields countField, CountBy.Include include)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe[] pipes, Fields groupingFields, Fields countField, CountBy.Include include, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe[] pipes, Fields groupingFields, Fields valueFields, Fields countField)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe[] pipes, Fields groupingFields, Fields valueFields, Fields countField, CountBy.Include include)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe[] pipes, Fields groupingFields, Fields valueFields, Fields countField, CountBy.Include include, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe[] pipes, Fields groupingFields, Fields valueFields, Fields countField, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe[] pipes, Fields groupingFields, Fields countField, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe pipe, Fields groupingFields, Fields countField)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe pipe, Fields groupingFields, Fields countField, CountBy.Include include)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe pipe, Fields groupingFields, Fields countField, CountBy.Include include, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe pipe, Fields groupingFields, Fields valueFields, Fields countField)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe pipe, Fields groupingFields, Fields valueFields, Fields countField, CountBy.Include include)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe pipe, Fields groupingFields, Fields valueFields, Fields countField, CountBy.Include include, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe pipe, Fields groupingFields, Fields valueFields, Fields countField, int threshold)` Constructor CountBy creates a new CountBy instance.
`CountBy(String name, Pipe pipe, Fields groupingFields, Fields countField, int threshold)` Constructor CountBy creates a new CountBy instance.

Method Summary

Methods inherited from class cascading.pipe.assembly.AggregateBy
`getAggregators, getArgumentFields, getFieldDeclarations, getFunctors, getGroupBy, getGroupingFields, initialize, initialize, verify`

Methods inherited from class cascading.pipe.SubAssembly
`getName, getPrevious, getTailNames, getTails, setPrevious, setTails, unwind`

Methods inherited from class cascading.pipe.Pipe
`equals, getConfigDef, getHeads, getParent, getStepConfigDef, getTrace, hasConfigDef, hashCode, hasStepConfigDef, id, isEquivalentTo, named, names, outgoingScopeFor, pipes, print, printInternal, resolveIncomingOperationArgumentFields, resolveIncomingOperationPassThroughFields, setParent, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

### DEFAULT_THRESHOLD

    @Deprecated
    public static final int DEFAULT_THRESHOLD

  Deprecated.
  DEFAULT_THRESHOLD

  See Also:
    Constant Field Values

Constructor Detail

### CountBy

    @ConstructorProperties(value="countField")
    public CountBy(Fields countField)

  Constructor CountBy creates a new CountBy instance. Use this constructor when used with a `AggregateBy` instance.

  Parameters:
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"countField","include"})
    public CountBy(Fields countField,
                                              CountBy.Include include)

  Constructor CountBy creates a new CountBy instance. Use this constructor when used with a `AggregateBy` instance.

  Parameters:
    `countField` - of type Fields
    `include` - of type Include

### CountBy

    @ConstructorProperties(value={"valueFields","countField"})
    public CountBy(Fields valueFields,
                                              Fields countField)

  Constructor CountBy creates a new CountBy instance. Use this constructor when used with a `AggregateBy` instance.

  Parameters:
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"valueFields","countField","include"})
    public CountBy(Fields valueFields,
                                              Fields countField,
                                              CountBy.Include include)

  Constructor CountBy creates a new CountBy instance. Use this constructor when used with a `AggregateBy` instance.

  Parameters:
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"pipe","groupingFields","countField"})
    public CountBy(Pipe pipe,
                                              Fields groupingFields,
                                              Fields countField)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"pipe","groupingFields","countField","threshold"})
    public CountBy(Pipe pipe,
                                              Fields groupingFields,
                                              Fields countField,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `countField` - fo type Fields
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"name","pipe","groupingFields","countField"})
    public CountBy(String name,
                                              Pipe pipe,
                                              Fields groupingFields,
                                              Fields countField)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"name","pipe","groupingFields","countField","threshold"})
    public CountBy(String name,
                                              Pipe pipe,
                                              Fields groupingFields,
                                              Fields countField,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"pipes","groupingFields","countField"})
    public CountBy(Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields countField)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"pipes","groupingFields","countField","threshold"})
    public CountBy(Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields countField,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"name","pipes","groupingFields","countField"})
    public CountBy(String name,
                                              Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields countField)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"name","pipes","groupingFields","countField","threshold"})
    public CountBy(String name,
                                              Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields countField,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"pipe","groupingFields","countField","include"})
    public CountBy(Pipe pipe,
                                              Fields groupingFields,
                                              Fields countField,
                                              CountBy.Include include)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include

### CountBy

    @ConstructorProperties(value={"pipe","groupingFields","countField","include","threshold"})
    public CountBy(Pipe pipe,
                                              Fields groupingFields,
                                              Fields countField,
                                              CountBy.Include include,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `countField` - fo type Fields
    `include` - of type Include
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"name","pipe","groupingFields","countField","include"})
    public CountBy(String name,
                                              Pipe pipe,
                                              Fields groupingFields,
                                              Fields countField,
                                              CountBy.Include include)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include

### CountBy

    @ConstructorProperties(value={"name","pipe","groupingFields","countField","include","threshold"})
    public CountBy(String name,
                                              Pipe pipe,
                                              Fields groupingFields,
                                              Fields countField,
                                              CountBy.Include include,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"pipes","groupingFields","countField","include"})
    public CountBy(Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields countField,
                                              CountBy.Include include)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include

### CountBy

    @ConstructorProperties(value={"pipes","groupingFields","countField","include","threshold"})
    public CountBy(Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields countField,
                                              CountBy.Include include,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"name","pipes","groupingFields","countField","include"})
    public CountBy(String name,
                                              Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields countField,
                                              CountBy.Include include)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include

### CountBy

    @ConstructorProperties(value={"name","pipes","groupingFields","countField","include","threshold"})
    public CountBy(String name,
                                              Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields countField,
                                              CountBy.Include include,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"pipe","groupingFields","valueFields","countField"})
    public CountBy(Pipe pipe,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"pipe","groupingFields","valueFields","countField","threshold"})
    public CountBy(Pipe pipe,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - fo type Fields
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"name","pipe","groupingFields","valueFields","countField"})
    public CountBy(String name,
                                              Pipe pipe,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"name","pipe","groupingFields","valueFields","countField","threshold"})
    public CountBy(String name,
                                              Pipe pipe,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"pipes","groupingFields","valueFields","countField"})
    public CountBy(Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"pipes","groupingFields","valueFields","countField","threshold"})
    public CountBy(Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"name","pipes","groupingFields","valueFields","countField"})
    public CountBy(String name,
                                              Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields

### CountBy

    @ConstructorProperties(value={"name","pipes","groupingFields","valueFields","countField","threshold"})
    public CountBy(String name,
                                              Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"pipe","groupingFields","valueFields","countField","include"})
    public CountBy(Pipe pipe,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              CountBy.Include include)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include

### CountBy

    @ConstructorProperties(value={"pipe","groupingFields","valueFields","countField","include","threshold"})
    public CountBy(Pipe pipe,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              CountBy.Include include,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - fo type Fields
    `include` - of type Include
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"name","pipe","groupingFields","valueFields","countField","include"})
    public CountBy(String name,
                                              Pipe pipe,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              CountBy.Include include)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipe` - of type Pipe
    `valueFields` - of type Fields
    `groupingFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include

### CountBy

    @ConstructorProperties(value={"name","pipe","groupingFields","valueFields","countField","include","threshold"})
    public CountBy(String name,
                                              Pipe pipe,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              CountBy.Include include,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipe` - of type Pipe
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"pipes","groupingFields","valueFields","countField","include"})
    public CountBy(Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              CountBy.Include include)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include

### CountBy

    @ConstructorProperties(value={"pipes","groupingFields","valueFields","countField","include","threshold"})
    public CountBy(Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              CountBy.Include include,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include
    `threshold` - of type int

### CountBy

    @ConstructorProperties(value={"name","pipes","groupingFields","valueFields","countField","include"})
    public CountBy(String name,
                                              Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              CountBy.Include include)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include

### CountBy

    @ConstructorProperties(value={"name","pipes","groupingFields","valueFields","countField","include","threshold"})
    public CountBy(String name,
                                              Pipe[] pipes,
                                              Fields groupingFields,
                                              Fields valueFields,
                                              Fields countField,
                                              CountBy.Include include,
                                              int threshold)

  Constructor CountBy creates a new CountBy instance.

  Parameters:
    `name` - of type String
    `pipes` - of type Pipe[]
    `groupingFields` - of type Fields
    `valueFields` - of type Fields
    `countField` - of type Fields
    `include` - of type Include
    `threshold` - of type int

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