GroupByQueryResources (druid-processing 28.0.1 API)

java.lang.Object
- org.apache.druid.query.groupby.GroupByQueryResources

All Implemented Interfaces:

Closeable, AutoCloseable
```
public class GroupByQueryResources
extends Object
implements Closeable
```
This class contains resources required for a groupBy query execution. Currently, it contains only merge buffers, but any additional resources can be added in the future.

Constructor Summary

Constructors
Constructor Description

GroupByQueryResources()

GroupByQueryResources(List<ReferenceCountingResourceHolder<ByteBuffer>> mergeBufferHolders)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`
`static int`	`countRequiredMergeBufferNum(GroupByQuery query)`
`ResourceHolder<ByteBuffer>`	`getMergeBuffer()`	Get a merge buffer from the pre-acquired resources.

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

- Constructor Detail
  - GroupByQueryResources
```
public GroupByQueryResources()
```
  - GroupByQueryResources
```
public GroupByQueryResources(List<ReferenceCountingResourceHolder<ByteBuffer>> mergeBufferHolders)
```
- Method Detail
  - countRequiredMergeBufferNum
```
public static int countRequiredMergeBufferNum(GroupByQuery query)
```
  - getMergeBuffer
```
public ResourceHolder<ByteBuffer> getMergeBuffer()
```
    Get a merge buffer from the pre-acquired resources.
    
    Returns:
    
    a resource holder containing a merge buffer
    
    Throws:
    
    IllegalStateException - if this resource is initialized with empty merge buffers, or there isn't any available merge buffers
  - close
```
public void close()
```
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface Closeable