FetchContext (Pinot Segment Service Provider Interface 0.12.1 API)

java.lang.Object
- org.apache.pinot.segment.spi.FetchContext

```
public class FetchContext
extends Object
```
The context for fetching buffers of a segment during query.

Constructor Summary

Constructors
Constructor	Description
`FetchContext(UUID fetchId, String segmentName, Map<String,List<ColumnIndexType>> columnToIndexList)`	Create a new FetchRequest for this segment, to fetch those indexes as mentioned in the column to indexes list map
`FetchContext(UUID fetchId, String segmentName, Set<String> columns)`	Create a new FetchRequest for this segment, to fetch all buffers of the given columns

Method Summary

Modifier and Type	Method	Description
`Map<String,List<ColumnIndexType>>`	`getColumnToIndexList()`	Map of columns to fetch as key, and the list of indexes to fetch for the column as value The list of indexes can be null, which indicates that every index for this column should be fetched
`UUID`	`getFetchId()`	An id to uniquely identify the fetch request
`String`	`getSegmentName()`	Segment name associated with this fetch context
`boolean`	`isEmpty()`

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

- Constructor Detail
  - FetchContext
```
public FetchContext(UUID fetchId,
                    String segmentName,
                    Set<String> columns)
```
    Create a new FetchRequest for this segment, to fetch all buffers of the given columns
    
    Parameters:
    
    fetchId - unique fetch id
    
    segmentName - segment name
    
    columns - set of columns to fetch
  - FetchContext
```
public FetchContext(UUID fetchId,
                    String segmentName,
                    Map<String,List<ColumnIndexType>> columnToIndexList)
```
    Create a new FetchRequest for this segment, to fetch those indexes as mentioned in the column to indexes list map
    
    Parameters:
    
    fetchId - unique fetch id
    
    segmentName - segment name
    
    columnToIndexList - map of column names as key, and list of indexes to fetch as values
- Method Detail
  - getFetchId
```
public UUID getFetchId()
```
    An id to uniquely identify the fetch request
    
    Returns:
    
    unique uuid
  - getSegmentName
```
public String getSegmentName()
```
    Segment name associated with this fetch context
  - getColumnToIndexList
```
public Map<String,List<ColumnIndexType>> getColumnToIndexList()
```
    Map of columns to fetch as key, and the list of indexes to fetch for the column as value The list of indexes can be null, which indicates that every index for this column should be fetched
  - isEmpty
```
public boolean isEmpty()
```