MergeStrategy (Solr 9.4.1 core API)

All Known Implementing Classes:

IterativeMergeStrategy
```
public interface MergeStrategy
```
The MergeStrategy class defines custom merge logic for distributed searches.
Note: This API is experimental and may change in non backward-compatible ways in the future

Field Summary

Fields
Modifier and Type Field Description

static Comparator<MergeStrategy> MERGE_COMP

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`getCost()`	Defines the order that the mergeStrategies are applied.
`void`	`handleMergeFields(ResponseBuilder rb, SolrIndexSearcher searcher)`	Implement handleMergeFields(ResponseBuilder rb, SolrIndexSearch searcher) if your merge strategy needs more complex data then the sort fields provide.
`boolean`	`handlesMergeFields()`	handlesMergeFields must return true if the MergeStrategy implements a custom handleMergeFields(ResponseBuilder rb, SolrIndexSearch searcher)
`void`	`merge(ResponseBuilder rb, ShardRequest sreq)`	merge defines the merging behaving of results that are collected from the shards during a distributed search.
`boolean`	`mergesIds()`	mergesIds must return true if the merge method merges document ids from the shards.

- Field Detail
  - MERGE_COMP
```
static final Comparator<MergeStrategy> MERGE_COMP
```
- Method Detail
  - merge
```
void merge(ResponseBuilder rb,
           ShardRequest sreq)
```
    merge defines the merging behaving of results that are collected from the shards during a distributed search.
  - mergesIds
```
boolean mergesIds()
```
    mergesIds must return true if the merge method merges document ids from the shards. If it merges other output from the shards it must return false.
  - handlesMergeFields
```
boolean handlesMergeFields()
```
    handlesMergeFields must return true if the MergeStrategy implements a custom handleMergeFields(ResponseBuilder rb, SolrIndexSearch searcher)
  - handleMergeFields
```
void handleMergeFields(ResponseBuilder rb,
                       SolrIndexSearcher searcher)
                throws IOException
```
    Implement handleMergeFields(ResponseBuilder rb, SolrIndexSearch searcher) if your merge strategy needs more complex data then the sort fields provide.
    
    Throws:
    
    IOException
  - getCost
```
int getCost()
```
    Defines the order that the mergeStrategies are applied. Lower costs are applied first.