ColumnPartitionMetadata (Pinot Segment Service Provider Interface 0.12.1 API)

java.lang.Object
- org.apache.pinot.segment.spi.partition.metadata.ColumnPartitionMetadata

```
public class ColumnPartitionMetadata
extends Object
```
Class for partition related column metadata:
- The name of the Partition function used to map the column values to their partitions
- Total number of partitions
- Set of partitions the column contains

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class ColumnPartitionMetadata.ColumnPartitionMetadataDeserializer
Custom deserializer for ColumnPartitionMetadata.

Constructor Summary

Constructors
Constructor	Description
`ColumnPartitionMetadata(String functionName, int numPartitions, Set<Integer> partitions, Map<String,String> functionConfig)`	Constructor for the class.

Method Summary

Modifier and Type	Method	Description
`boolean`	`equals(Object obj)`
`static Set<Integer>`	`extractPartitions(List partitionList)`	Helper method to extract partitions from configuration.
`Map<String,String>`	`getFunctionConfig()`
`String`	`getFunctionName()`
`int`	`getNumPartitions()`
`Set<Integer>`	`getPartitions()`
`int`	`hashCode()`

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

- Constructor Detail
  - ColumnPartitionMetadata
```
public ColumnPartitionMetadata(String functionName,
                               int numPartitions,
                               Set<Integer> partitions,
                               @Nullable
                               Map<String,String> functionConfig)
```
    Constructor for the class.
    
    Parameters:
    
    functionName - Name of the partition function
    
    numPartitions - Number of total partitions for this column
    
    partitions - Set of partitions the column contains
    
    functionConfig - Configuration required by partition function.
- Method Detail
  - getFunctionName
```
public String getFunctionName()
```
  - getNumPartitions
```
public int getNumPartitions()
```
  - getPartitions
```
public Set<Integer> getPartitions()
```
  - getFunctionConfig
```
public Map<String,String> getFunctionConfig()
```
  - equals
```
public boolean equals(Object obj)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - extractPartitions
```
public static Set<Integer> extractPartitions(List partitionList)
```
    Helper method to extract partitions from configuration.
    There are two format of partition strings:
    
    Integer format: e.g. "0"
    
    Range format (legacy): e.g. "[0 5]"
    TODO: remove range format once all segments use integer format