php - How to pass function in sort parameter in solr through drupal7 hooks -

i want pass function "map" in sort parameter drupal using hooks. moto sort listing after mapping fields.

my solr server query is: http://local.host:8983/solr/collection1/select?q=%3a&sort=map(is_site_web_id%2c2%2c2%2c1%2c0)+desc&fl=site%2curl%2clabel%2cis_site_web_id&wt=json&indent=true

its working fine on solr server.

i third below code in drupal7:

function my_solr_module_apachesolr_index_document_build_node(apachesolrdocument $document, $entity, $env_id) {     $document->setfield('is_site_web_id', 1);  }  function my_solr_module_apachesolr_query_alter($query) {     $query->addparam('fl', array('is_site_web_id'));     //$query->addparam('bf', array('freshness' =>'map(is_site_web_id,2,2,1,0)'));     $query->setsolrsort('is_site_web_id', 'asc');     //$query->setsolrsort('map(is_site_web_id%2c2%2c2%2c1%2c0)', 'desc'); }  function  my_solr_module_apachesolr_query_prepare($query){     $query->setavailablesort('is_site_web_id', array('title' => t('site web id'),'default' => 'asc',));     //$query->setavailablesort('is_site_web_id', "map(is_site_web_id,2,2,1,0)"); } 

when print perameters function "search" in solr_base_query.php, getting sort: [sort] => is_site_web_id asc )

i want apply condition in sorting in drupal7 using hooks: map(is_site_web_id,2,2,1,0)

i applied below code in module function:

function my_solr_module_apachesolr_query_alter($query) {     $query->addparam('fl', array('is_site_web_id'));     $query->addparam('sort', array('is_site_web_id' =>'map(is_site_web_id,2,2,1,0) desc'));   } 

and working fine. :)