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    // Add a search_* tag. This needs to be added before any preExecute methods

    // for decorated queries are called, as $this->prepared will be set to TRUE

    // and tags added in the execute method will never get used. For example,

    // if $query is extended by 'SearchQuery' then 'PagerDefault', the

    // search-specific tag will be added too late (when preExecute() has

    // already been called from the PagerDefault extender), and as a

    // consequence will not be available to hook_query_alter() implementations,

    // nor will the correct hook_query_TAG_alter() implementations get invoked.

    // See node_search_execute().

    $this->addTag('search_' . $module);

    // Add useful metadata.