UnfilteredPartitionIterators.MergeListener (apache-cassandra API)

All Known Implementing Classes:

PartitionIteratorMergeListener

Enclosing class:

UnfilteredPartitionIterators
```
public static interface UnfilteredPartitionIterators.MergeListener
```

Field Summary

Fields
Modifier and Type Field Description

static UnfilteredPartitionIterators.MergeListener NOOP

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default void`	`close()`
`UnfilteredRowIterators.MergeListener`	`getRowMergeListener(DecoratedKey partitionKey, java.util.List<UnfilteredRowIterator> versions)`
`default boolean`	`preserveOrder()`	Returns true if the merger needs to preserve the position of sources within the merge when passing data to the listener.

- Field Detail
  - NOOP
```
static final UnfilteredPartitionIterators.MergeListener NOOP
```
- Method Detail
  - preserveOrder
```
default boolean preserveOrder()
```
    Returns true if the merger needs to preserve the position of sources within the merge when passing data to the listener. If false, the merger can avoid creating empty sources for non-present partitions and significantly speed up processing.
    
    Returns:
    
    True to preserve position of source iterators.
  - getRowMergeListener
```
UnfilteredRowIterators.MergeListener getRowMergeListener(DecoratedKey partitionKey,
                                                         java.util.List<UnfilteredRowIterator> versions)
```
  - close
```
default void close()
```