Enables caching for result grouping

# SolrQuery::setGroupCachePercent

(PECL solr >= 2.2.0)

SolrQuery::setGroupCachePercent — Enables caching for result grouping

### 説明

public SolrQuery::setGroupCachePercent ( int `$percent` ) : SolrQuery

Setting this parameter to a number greater than 0 enables caching for result grouping. Result Grouping executes two searches; this option caches the second search. The server default value is 0. Testing has shown that group caching only improves search time with Boolean, wildcard, and fuzzy queries. For simple queries like term or "match all" queries, group caching degrades performance. group.cache.percent parameter

### パラメータ

`percent`

### 返り値

### エラー / 例外

Emits SolrIllegalArgumentException in case of an invalid parameter was passed.

### 参考

- SolrQuery::setGroup() - Enable/Disable result grouping (group parameter)
- SolrQuery::addGroupField() - Add a field to be used to group results
- SolrQuery::addGroupFunction() - Allows grouping results based on the unique values of a function query (group.func parameter)
- SolrQuery::addGroupQuery() - Allows grouping of documents that match the given query
- SolrQuery::addGroupSortField() - Add a group sort field (group.sort parameter)
- SolrQuery::setGroupFacet() - Sets group.facet parameter
- SolrQuery::setGroupOffset() - Sets the group.offset parameter
- SolrQuery::setGroupLimit() - Specifies the number of results to return for each group. The server default value is 1
- SolrQuery::setGroupMain() - If true, the result of the first field grouping command is used as the main result list in the response, using group.format=simple
- SolrQuery::setGroupNGroups() - If true, Solr includes the number of groups that have matched the query in the results
- SolrQuery::setGroupTruncate() - If true, facet counts are based on the most relevant document of each group matching the query
- SolrQuery::setGroupFormat() - Sets the group format, result structure (group.format parameter)