views_plugin_pager_full::exposed_form_alter in core/modules/views/plugins/views_plugin_pager_full.inc

views_plugin_pager_full::query in core/modules/views/plugins/views_plugin_pager_full.inc

Modify the query for paging

views_plugin_pager_full::uses_exposed in core/modules/views/plugins/views_plugin_pager_full.inc