pre execute query views drupal 7

a.module

<?php
function cableonda_sports_photogallery_views_pre_execute(view &$view) {
  if ($view->name == 'photogallery_by_activity') {
    if($view->current_display =='block_1'){
     
     $query = $view->build_info['query'];
      $query2 = db_select('node', 'a')->fields('a',array('nid'));
      $query2->addField('a', 'created', 'node_created');
      $query2->addExpression("'node'", 'field_data_field_photo_imagen_node_entity_type');
      $query2->addExpression("'photogallery_by_activity:block_1'", 'view_name');
      $query2->leftJoin("field_data_field_photo_reference", "b", "a.nid = b.entity_id AND (b.entity_type = 'node' AND b.deleted = '0') ");
      $query2->where("(( (a.nid != '".$view->args[0]."' OR a.nid IS NULL) AND (b.field_photo_reference_target_id = '".$view->args[1]."' ) ) AND (( (a.status = '1') AND (a.type IN  ('photo')) )))");

      $view->build_info['query'] = $query->union($query2);
    }