Change the search schema and indexing.

The table data is preserved where possible in MYSQL and MYSQLi using ALTER IGNORE. Other databases don't support that, so for them the tables are dropped and re-created, and will need to be re-indexed from scratch.

Related topics

File

drupal-6.x/modules/system/system.install, line 2272

Code

function system_update_6036() {
  $ret = array();
  if (db_table_exists('search_index')) {
    // Create the search_dataset.reindex column.
    db_add_field($ret, 'search_dataset', 'reindex', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));

    // Drop the search_index.from fields which are no longer used.
    db_drop_index($ret, 'search_index', 'from_sid_type');
    db_drop_field($ret, 'search_index', 'fromsid');
    db_drop_field($ret, 'search_index', 'fromtype');

    // Drop the search_dataset.sid_type index, so that it can be made unique.
    db_drop_index($ret, 'search_dataset', 'sid_type');

    // Create the search_node_links Table.
    $search_node_links_schema = array(
      'fields' => array(
        'sid' => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
        'type' => array('type' => 'varchar', 'length' => 16, 'not null' => TRUE, 'default' => ''),
        'nid' => array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0),
        'caption' => array('type' => 'text', 'size' => 'big', 'not null' => FALSE),
      ),
      'primary key' => array('sid', 'type', 'nid'),
      'indexes' => array('nid' => array('nid')),
    );
    db_create_table($ret, 'search_node_links', $search_node_links_schema);

    // with the change to search_dataset.reindex, the search queue is handled differently,
    // and this is no longer needed
    variable_del('node_cron_last');

    // Add a unique index for the search_index.
    if ($GLOBALS['db_type'] == 'mysql' || $GLOBALS['db_type'] == 'mysqli') {
      // Since it's possible that some existing sites have duplicates,
      // create the index using the IGNORE keyword, which ignores duplicate errors.
      // However, pgsql doesn't support it
      $ret[] = update_sql("ALTER IGNORE TABLE {search_index} ADD UNIQUE KEY word_sid_type (word, sid, type)");
      $ret[] = update_sql("ALTER IGNORE TABLE {search_dataset} ADD UNIQUE KEY sid_type (sid, type)");

      // Everything needs to be reindexed.
      $ret[] = update_sql("UPDATE {search_dataset} SET reindex = 1");
    }
    else {
      // Delete the existing tables if there are duplicate values
      if (db_result(db_query("SELECT sid FROM {search_dataset} GROUP BY sid, type HAVING COUNT(*) > 1")) || db_result(db_query("SELECT sid FROM {search_index} GROUP BY word, sid, type HAVING COUNT(*) > 1"))) {
        $ret[] = update_sql('DELETE FROM {search_dataset}');
        $ret[] = update_sql('DELETE FROM {search_index}');
        $ret[] = update_sql('DELETE FROM {search_total}');
      }
      else {
        // Everything needs to be reindexed.
        $ret[] = update_sql("UPDATE {search_dataset} SET reindex = 1");
      }

      // create the new indexes
      db_add_unique_key($ret, 'search_index', 'word_sid_type', array('word', 'sid', 'type'));
      db_add_unique_key($ret, 'search_dataset', 'sid_type', array('sid', 'type'));
    }
  }
  return $ret;
}