6 calls to db_and()

ManyToOneHelper::add_filter in drupal/core/modules/views/lib/Drupal/views/ManyToOneHelper.php
Search::query in drupal/core/modules/search/lib/Drupal/search/Plugin/views/argument/Search.php
Add this argument to the query.
Search::query in drupal/core/modules/search/lib/Drupal/search/Plugin/views/filter/Search.php
Add this filter to the query.
SearchQuery::parseSearchExpression in drupal/core/modules/search/lib/Drupal/search/SearchQuery.php
Parses the search query into SQL conditions.
Sql::build_condition in drupal/core/modules/views/lib/Drupal/views/Plugin/views/query/Sql.php
Construct the "WHERE" or "HAVING" part of the query.
String::op_word in drupal/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php