(バージョン情報なし。おそらく SVN 版にしか存在しないでしょう)
SolrDisMaxQuery::setBoostFunction — Sets a Boost Function (bf parameter).
Sets Boost Function (bf parameter).
Functions (with optional boosts) that will be included in the user's query to influence the score. Any function supported natively by Solr can be used, along with a boost value. e.g.:
recip(rord(myfield),1,2,3)^1.5
function
例1 SolrDisMaxQuery::setBoostFunction() example
<?php
$dismaxQuery = new SolrDisMaxQuery('lucene');
$boostRecentDocsFunction = "recip(ms(NOW,mydatefield),3.16e-11,1,1)";
$dismaxQuery->setBoostFunction($boostRecentDocsFunction);
echo $dismaxQuery.PHP_EOL;
?>
上の例の出力は、 たとえば以下のようになります。
q=lucene&defType=edismax&bf=recip(ms(NOW,mydatefield),3.16e-11,1,1)