NullColumnPartSerde (druid-processing 28.0.1 API)

java.lang.Object
- org.apache.druid.segment.serde.NullColumnPartSerde

All Implemented Interfaces:

ColumnPartSerde
```
public class NullColumnPartSerde
extends Object
implements ColumnPartSerde
```
A ColumnPartSerde to read and write null-only columns. Its serializer is no-op as nothing is stored for null-only columns. Its deserializer creates necessary column metadata and indexes when the column is read.

Nested Class Summary
- Nested classes/interfaces inherited from interface org.apache.druid.segment.serde.ColumnPartSerde
  ColumnPartSerde.Deserializer

Constructor Summary

Constructors
Constructor Description

NullColumnPartSerde(int numRows, BitmapSerdeFactory bitmapSerdeFactory)

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object o)`
`BitmapSerdeFactory`	`getBitmapSerdeFactory()`	Deprecated.
`ColumnPartSerde.Deserializer`	`getDeserializer()`	Returns a Deserializer to read a column from a segment.
`int`	`getNumRows()`
`Serializer`	`getSerializer()`
`int`	`hashCode()`

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

- Constructor Detail
  - NullColumnPartSerde
```
public NullColumnPartSerde(int numRows,
                           BitmapSerdeFactory bitmapSerdeFactory)
```
- Method Detail
  - getNumRows
```
public int getNumRows()
```
  - getBitmapSerdeFactory
```
@Deprecated
public BitmapSerdeFactory getBitmapSerdeFactory()
```
    Deprecated.
    
    This is no longer used for anything, but is required for backwards compatibility, so that segments with explicit null columns can be read with 0.23
  - getSerializer
```
@Nullable
public Serializer getSerializer()
```
    Specified by:
    
    getSerializer in interface ColumnPartSerde
  - getDeserializer
```
public ColumnPartSerde.Deserializer getDeserializer()
```
    Description copied from interface: ColumnPartSerde
    
    Returns a Deserializer to read a column from a segment.
    
    Specified by:
    
    getDeserializer in interface ColumnPartSerde
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object