diff --git a/src/applications/diffusion/query/DiffusionPullLogSearchEngine.php b/src/applications/diffusion/query/DiffusionPullLogSearchEngine.php
index 8d6102d4eb..fc7cee52ce 100644
--- a/src/applications/diffusion/query/DiffusionPullLogSearchEngine.php
+++ b/src/applications/diffusion/query/DiffusionPullLogSearchEngine.php
@@ -1,166 +1,158 @@
 <?php
 
 final class DiffusionPullLogSearchEngine
   extends PhabricatorApplicationSearchEngine {
 
   public function getResultTypeDescription() {
     return pht('Pull Logs');
   }
 
   public function getApplicationClassName() {
     return 'PhabricatorDiffusionApplication';
   }
 
   public function newQuery() {
     return new PhabricatorRepositoryPullEventQuery();
   }
 
   protected function buildQueryFromParameters(array $map) {
     $query = $this->newQuery();
 
     if ($map['repositoryPHIDs']) {
       $query->withRepositoryPHIDs($map['repositoryPHIDs']);
     }
 
     if ($map['pullerPHIDs']) {
       $query->withPullerPHIDs($map['pullerPHIDs']);
     }
 
     return $query;
   }
 
   protected function buildCustomSearchFields() {
     return array(
       id(new PhabricatorSearchDatasourceField())
         ->setDatasource(new DiffusionRepositoryDatasource())
         ->setKey('repositoryPHIDs')
         ->setAliases(array('repository', 'repositories', 'repositoryPHID'))
         ->setLabel(pht('Repositories'))
         ->setDescription(
           pht('Search for pull logs for specific repositories.')),
       id(new PhabricatorUsersSearchField())
         ->setKey('pullerPHIDs')
         ->setAliases(array('puller', 'pullers', 'pullerPHID'))
         ->setLabel(pht('Pullers'))
         ->setDescription(
           pht('Search for pull logs by specific users.')),
     );
   }
 
   protected function newExportFields() {
     return array(
-      id(new PhabricatorIDExportField())
-        ->setKey('id')
-        ->setLabel(pht('ID')),
-      id(new PhabricatorPHIDExportField())
-        ->setKey('phid')
-        ->setLabel(pht('PHID')),
       id(new PhabricatorPHIDExportField())
         ->setKey('repositoryPHID')
         ->setLabel(pht('Repository PHID')),
       id(new PhabricatorStringExportField())
         ->setKey('repository')
         ->setLabel(pht('Repository')),
       id(new PhabricatorPHIDExportField())
         ->setKey('pullerPHID')
         ->setLabel(pht('Puller PHID')),
       id(new PhabricatorStringExportField())
         ->setKey('puller')
         ->setLabel(pht('Puller')),
       id(new PhabricatorStringExportField())
         ->setKey('protocol')
         ->setLabel(pht('Protocol')),
       id(new PhabricatorStringExportField())
         ->setKey('result')
         ->setLabel(pht('Result')),
       id(new PhabricatorIntExportField())
         ->setKey('code')
         ->setLabel(pht('Code')),
       id(new PhabricatorEpochExportField())
         ->setKey('date')
         ->setLabel(pht('Date')),
     );
   }
 
-  public function newExport(array $events) {
+  protected function newExportData(array $events) {
     $viewer = $this->requireViewer();
 
     $phids = array();
     foreach ($events as $event) {
       if ($event->getPullerPHID()) {
         $phids[] = $event->getPullerPHID();
       }
     }
     $handles = $viewer->loadHandles($phids);
 
     $export = array();
     foreach ($events as $event) {
       $repository = $event->getRepository();
       if ($repository) {
         $repository_phid = $repository->getPHID();
         $repository_name = $repository->getDisplayName();
       } else {
         $repository_phid = null;
         $repository_name = null;
       }
 
       $puller_phid = $event->getPullerPHID();
       if ($puller_phid) {
         $puller_name = $handles[$puller_phid]->getName();
       } else {
         $puller_name = null;
       }
 
       $export[] = array(
-        'id' => $event->getID(),
-        'phid' => $event->getPHID(),
         'repositoryPHID' => $repository_phid,
         'repository' => $repository_name,
         'pullerPHID' => $puller_phid,
         'puller' => $puller_name,
         'protocol' => $event->getRemoteProtocol(),
         'result' => $event->getResultType(),
         'code' => $event->getResultCode(),
         'date' => $event->getEpoch(),
       );
     }
 
     return $export;
   }
 
   protected function getURI($path) {
     return '/diffusion/pulllog/'.$path;
   }
 
   protected function getBuiltinQueryNames() {
     return array(
       'all' => pht('All Pull Logs'),
     );
   }
 
   public function buildSavedQueryFromBuiltin($query_key) {
     $query = $this->newSavedQuery();
     $query->setQueryKey($query_key);
 
     switch ($query_key) {
       case 'all':
         return $query;
     }
 
     return parent::buildSavedQueryFromBuiltin($query_key);
   }
 
   protected function renderResultList(
     array $logs,
     PhabricatorSavedQuery $query,
     array $handles) {
 
     $table = id(new DiffusionPullLogListView())
       ->setViewer($this->requireViewer())
       ->setLogs($logs);
 
     return id(new PhabricatorApplicationSearchResultView())
       ->setTable($table);
   }
 
 }
diff --git a/src/applications/people/query/PhabricatorPeopleSearchEngine.php b/src/applications/people/query/PhabricatorPeopleSearchEngine.php
index db2256a8b8..e0e1b5070e 100644
--- a/src/applications/people/query/PhabricatorPeopleSearchEngine.php
+++ b/src/applications/people/query/PhabricatorPeopleSearchEngine.php
@@ -1,360 +1,352 @@
 <?php
 
 final class PhabricatorPeopleSearchEngine
   extends PhabricatorApplicationSearchEngine {
 
   public function getResultTypeDescription() {
     return pht('Users');
   }
 
   public function getApplicationClassName() {
     return 'PhabricatorPeopleApplication';
   }
 
   public function newQuery() {
     return id(new PhabricatorPeopleQuery())
       ->needPrimaryEmail(true)
       ->needProfileImage(true);
   }
 
   protected function buildCustomSearchFields() {
     $fields = array(
       id(new PhabricatorSearchStringListField())
         ->setLabel(pht('Usernames'))
         ->setKey('usernames')
         ->setAliases(array('username'))
         ->setDescription(pht('Find users by exact username.')),
       id(new PhabricatorSearchTextField())
         ->setLabel(pht('Name Contains'))
         ->setKey('nameLike')
         ->setDescription(
           pht('Find users whose usernames contain a substring.')),
       id(new PhabricatorSearchThreeStateField())
         ->setLabel(pht('Administrators'))
         ->setKey('isAdmin')
         ->setOptions(
           pht('(Show All)'),
           pht('Show Only Administrators'),
           pht('Hide Administrators'))
         ->setDescription(
           pht(
             'Pass true to find only administrators, or false to omit '.
             'administrators.')),
       id(new PhabricatorSearchThreeStateField())
         ->setLabel(pht('Disabled'))
         ->setKey('isDisabled')
         ->setOptions(
           pht('(Show All)'),
           pht('Show Only Disabled Users'),
           pht('Hide Disabled Users'))
         ->setDescription(
           pht(
             'Pass true to find only disabled users, or false to omit '.
             'disabled users.')),
       id(new PhabricatorSearchThreeStateField())
         ->setLabel(pht('Bots'))
         ->setKey('isBot')
         ->setAliases(array('isSystemAgent'))
         ->setOptions(
           pht('(Show All)'),
           pht('Show Only Bots'),
           pht('Hide Bots'))
         ->setDescription(
           pht(
             'Pass true to find only bots, or false to omit bots.')),
       id(new PhabricatorSearchThreeStateField())
         ->setLabel(pht('Mailing Lists'))
         ->setKey('isMailingList')
         ->setOptions(
           pht('(Show All)'),
           pht('Show Only Mailing Lists'),
           pht('Hide Mailing Lists'))
         ->setDescription(
           pht(
             'Pass true to find only mailing lists, or false to omit '.
             'mailing lists.')),
       id(new PhabricatorSearchThreeStateField())
         ->setLabel(pht('Needs Approval'))
         ->setKey('needsApproval')
         ->setOptions(
           pht('(Show All)'),
           pht('Show Only Unapproved Users'),
           pht('Hide Unapproved Users'))
         ->setDescription(
           pht(
             'Pass true to find only users awaiting administrative approval, '.
             'or false to omit these users.')),
     );
 
     $viewer = $this->requireViewer();
     if ($viewer->getIsAdmin()) {
       $fields[] = id(new PhabricatorSearchThreeStateField())
         ->setLabel(pht('Has MFA'))
         ->setKey('mfa')
         ->setOptions(
           pht('(Show All)'),
           pht('Show Only Users With MFA'),
           pht('Hide Users With MFA'))
         ->setDescription(
           pht(
             'Pass true to find only users who are enrolled in MFA, or false '.
             'to omit these users.'));
     }
 
     $fields[] = id(new PhabricatorSearchDateField())
       ->setKey('createdStart')
       ->setLabel(pht('Joined After'))
       ->setDescription(
         pht('Find user accounts created after a given time.'));
 
     $fields[] = id(new PhabricatorSearchDateField())
       ->setKey('createdEnd')
       ->setLabel(pht('Joined Before'))
       ->setDescription(
         pht('Find user accounts created before a given time.'));
 
     return $fields;
   }
 
   protected function getDefaultFieldOrder() {
     return array(
       '...',
       'createdStart',
       'createdEnd',
     );
   }
 
   protected function buildQueryFromParameters(array $map) {
     $query = $this->newQuery();
 
     $viewer = $this->requireViewer();
 
     // If the viewer can't browse the user directory, restrict the query to
     // just the user's own profile. This is a little bit silly, but serves to
     // restrict users from creating a dashboard panel which essentially just
     // contains a user directory anyway.
     $can_browse = PhabricatorPolicyFilter::hasCapability(
       $viewer,
       $this->getApplication(),
       PeopleBrowseUserDirectoryCapability::CAPABILITY);
     if (!$can_browse) {
       $query->withPHIDs(array($viewer->getPHID()));
     }
 
     if ($map['usernames']) {
       $query->withUsernames($map['usernames']);
     }
 
     if ($map['nameLike']) {
       $query->withNameLike($map['nameLike']);
     }
 
     if ($map['isAdmin'] !== null) {
       $query->withIsAdmin($map['isAdmin']);
     }
 
     if ($map['isDisabled'] !== null) {
       $query->withIsDisabled($map['isDisabled']);
     }
 
     if ($map['isMailingList'] !== null) {
       $query->withIsMailingList($map['isMailingList']);
     }
 
     if ($map['isBot'] !== null) {
       $query->withIsSystemAgent($map['isBot']);
     }
 
     if ($map['needsApproval'] !== null) {
       $query->withIsApproved(!$map['needsApproval']);
     }
 
     if (idx($map, 'mfa') !== null) {
       $viewer = $this->requireViewer();
       if (!$viewer->getIsAdmin()) {
         throw new PhabricatorSearchConstraintException(
           pht(
             'The "Has MFA" query constraint may only be used by '.
             'administrators, to prevent attackers from using it to target '.
             'weak accounts.'));
       }
 
       $query->withIsEnrolledInMultiFactor($map['mfa']);
     }
 
     if ($map['createdStart']) {
       $query->withDateCreatedAfter($map['createdStart']);
     }
 
     if ($map['createdEnd']) {
       $query->withDateCreatedBefore($map['createdEnd']);
     }
 
     return $query;
   }
 
   protected function getURI($path) {
     return '/people/'.$path;
   }
 
   protected function getBuiltinQueryNames() {
     $names = array(
       'active' => pht('Active'),
       'all' => pht('All'),
     );
 
     $viewer = $this->requireViewer();
     if ($viewer->getIsAdmin()) {
       $names['approval'] = pht('Approval Queue');
     }
 
     return $names;
   }
 
   public function buildSavedQueryFromBuiltin($query_key) {
     $query = $this->newSavedQuery();
     $query->setQueryKey($query_key);
 
     switch ($query_key) {
       case 'all':
         return $query;
       case 'active':
         return $query
           ->setParameter('isDisabled', false);
       case 'approval':
         return $query
           ->setParameter('needsApproval', true)
           ->setParameter('isDisabled', false);
     }
 
     return parent::buildSavedQueryFromBuiltin($query_key);
   }
 
   protected function renderResultList(
     array $users,
     PhabricatorSavedQuery $query,
     array $handles) {
 
     assert_instances_of($users, 'PhabricatorUser');
 
     $request = $this->getRequest();
     $viewer = $this->requireViewer();
 
     $list = new PHUIObjectItemListView();
 
     $is_approval = ($query->getQueryKey() == 'approval');
 
     foreach ($users as $user) {
       $primary_email = $user->loadPrimaryEmail();
       if ($primary_email && $primary_email->getIsVerified()) {
         $email = pht('Verified');
       } else {
         $email = pht('Unverified');
       }
 
       $item = new PHUIObjectItemView();
       $item->setHeader($user->getFullName())
         ->setHref('/p/'.$user->getUsername().'/')
         ->addAttribute(phabricator_datetime($user->getDateCreated(), $viewer))
         ->addAttribute($email)
         ->setImageURI($user->getProfileImageURI());
 
       if ($is_approval && $primary_email) {
         $item->addAttribute($primary_email->getAddress());
       }
 
       if ($user->getIsDisabled()) {
         $item->addIcon('fa-ban', pht('Disabled'));
         $item->setDisabled(true);
       }
 
       if (!$is_approval) {
         if (!$user->getIsApproved()) {
           $item->addIcon('fa-clock-o', pht('Needs Approval'));
         }
       }
 
       if ($user->getIsAdmin()) {
         $item->addIcon('fa-star', pht('Admin'));
       }
 
       if ($user->getIsSystemAgent()) {
         $item->addIcon('fa-desktop', pht('Bot'));
       }
 
       if ($user->getIsMailingList()) {
         $item->addIcon('fa-envelope-o', pht('Mailing List'));
       }
 
       if ($viewer->getIsAdmin()) {
         if ($user->getIsEnrolledInMultiFactor()) {
           $item->addIcon('fa-lock', pht('Has MFA'));
         }
       }
 
       if ($viewer->getIsAdmin()) {
         $user_id = $user->getID();
         if ($is_approval) {
           $item->addAction(
             id(new PHUIListItemView())
               ->setIcon('fa-ban')
               ->setName(pht('Disable'))
               ->setWorkflow(true)
               ->setHref($this->getApplicationURI('disapprove/'.$user_id.'/')));
           $item->addAction(
             id(new PHUIListItemView())
               ->setIcon('fa-thumbs-o-up')
               ->setName(pht('Approve'))
               ->setWorkflow(true)
               ->setHref($this->getApplicationURI('approve/'.$user_id.'/')));
         }
       }
 
       $list->addItem($item);
     }
 
     $result = new PhabricatorApplicationSearchResultView();
     $result->setObjectList($list);
     $result->setNoDataString(pht('No accounts found.'));
 
     return $result;
   }
 
   protected function newExportFields() {
     return array(
-      id(new PhabricatorIDExportField())
-        ->setKey('id')
-        ->setLabel(pht('ID')),
-      id(new PhabricatorPHIDExportField())
-        ->setKey('phid')
-        ->setLabel(pht('PHID')),
       id(new PhabricatorStringExportField())
         ->setKey('username')
         ->setLabel(pht('Username')),
       id(new PhabricatorStringExportField())
         ->setKey('realName')
         ->setLabel(pht('Real Name')),
       id(new PhabricatorEpochExportField())
         ->setKey('created')
         ->setLabel(pht('Date Created')),
     );
   }
 
-  public function newExport(array $users) {
+  protected function newExportData(array $users) {
     $viewer = $this->requireViewer();
 
     $export = array();
     foreach ($users as $user) {
       $export[] = array(
-        'id' => $user->getID(),
-        'phid' => $user->getPHID(),
         'username' => $user->getUsername(),
         'realName' => $user->getRealName(),
         'created' => $user->getDateCreated(),
       );
     }
 
     return $export;
   }
 
 }
diff --git a/src/applications/search/controller/PhabricatorApplicationSearchController.php b/src/applications/search/controller/PhabricatorApplicationSearchController.php
index d3b05d1e3e..037a626f26 100644
--- a/src/applications/search/controller/PhabricatorApplicationSearchController.php
+++ b/src/applications/search/controller/PhabricatorApplicationSearchController.php
@@ -1,917 +1,906 @@
 <?php
 
 final class PhabricatorApplicationSearchController
   extends PhabricatorSearchBaseController {
 
   private $searchEngine;
   private $navigation;
   private $queryKey;
   private $preface;
 
   public function setPreface($preface) {
     $this->preface = $preface;
     return $this;
   }
 
   public function getPreface() {
     return $this->preface;
   }
 
   public function setQueryKey($query_key) {
     $this->queryKey = $query_key;
     return $this;
   }
 
   protected function getQueryKey() {
     return $this->queryKey;
   }
 
   public function setNavigation(AphrontSideNavFilterView $navigation) {
     $this->navigation = $navigation;
     return $this;
   }
 
   protected function getNavigation() {
     return $this->navigation;
   }
 
   public function setSearchEngine(
     PhabricatorApplicationSearchEngine $search_engine) {
     $this->searchEngine = $search_engine;
     return $this;
   }
 
   protected function getSearchEngine() {
     return $this->searchEngine;
   }
 
   protected function validateDelegatingController() {
     $parent = $this->getDelegatingController();
 
     if (!$parent) {
       throw new Exception(
         pht('You must delegate to this controller, not invoke it directly.'));
     }
 
     $engine = $this->getSearchEngine();
     if (!$engine) {
       throw new PhutilInvalidStateException('setEngine');
     }
 
     $engine->setViewer($this->getRequest()->getUser());
 
     $parent = $this->getDelegatingController();
   }
 
   public function processRequest() {
     $this->validateDelegatingController();
 
     $query_action = $this->getRequest()->getURIData('queryAction');
     if ($query_action == 'export') {
       return $this->processExportRequest();
     }
 
     $key = $this->getQueryKey();
     if ($key == 'edit') {
       return $this->processEditRequest();
     } else {
       return $this->processSearchRequest();
     }
   }
 
   private function processSearchRequest() {
     $parent = $this->getDelegatingController();
     $request = $this->getRequest();
     $user = $request->getUser();
     $engine = $this->getSearchEngine();
     $nav = $this->getNavigation();
     if (!$nav) {
       $nav = $this->buildNavigation();
     }
 
     if ($request->isFormPost()) {
       $saved_query = $engine->buildSavedQueryFromRequest($request);
       $engine->saveQuery($saved_query);
       return id(new AphrontRedirectResponse())->setURI(
         $engine->getQueryResultsPageURI($saved_query->getQueryKey()).'#R');
     }
 
     $named_query = null;
     $run_query = true;
     $query_key = $this->queryKey;
     if ($this->queryKey == 'advanced') {
       $run_query = false;
       $query_key = $request->getStr('query');
     } else if (!strlen($this->queryKey)) {
       $found_query_data = false;
 
       if ($request->isHTTPGet() || $request->isQuicksand()) {
         // If this is a GET request and it has some query data, don't
         // do anything unless it's only before= or after=. We'll build and
         // execute a query from it below. This allows external tools to build
         // URIs like "/query/?users=a,b".
         $pt_data = $request->getPassthroughRequestData();
 
         $exempt = array(
           'before' => true,
           'after' => true,
           'nux' => true,
           'overheated' => true,
         );
 
         foreach ($pt_data as $pt_key => $pt_value) {
           if (isset($exempt[$pt_key])) {
             continue;
           }
 
           $found_query_data = true;
           break;
         }
       }
 
       if (!$found_query_data) {
         // Otherwise, there's no query data so just run the user's default
         // query for this application.
         $query_key = $engine->getDefaultQueryKey();
       }
     }
 
     if ($engine->isBuiltinQuery($query_key)) {
       $saved_query = $engine->buildSavedQueryFromBuiltin($query_key);
       $named_query = idx($engine->loadEnabledNamedQueries(), $query_key);
     } else if ($query_key) {
       $saved_query = id(new PhabricatorSavedQueryQuery())
         ->setViewer($user)
         ->withQueryKeys(array($query_key))
         ->executeOne();
 
       if (!$saved_query) {
         return new Aphront404Response();
       }
 
       $named_query = idx($engine->loadEnabledNamedQueries(), $query_key);
     } else {
       $saved_query = $engine->buildSavedQueryFromRequest($request);
 
       // Save the query to generate a query key, so "Save Custom Query..." and
       // other features like Maniphest's "Export..." work correctly.
       $engine->saveQuery($saved_query);
     }
 
     $nav->selectFilter(
       'query/'.$saved_query->getQueryKey(),
       'query/advanced');
 
     $form = id(new AphrontFormView())
       ->setUser($user)
       ->setAction($request->getPath());
 
     $engine->buildSearchForm($form, $saved_query);
 
     $errors = $engine->getErrors();
     if ($errors) {
       $run_query = false;
     }
 
     $submit = id(new AphrontFormSubmitControl())
       ->setValue(pht('Search'));
 
     if ($run_query && !$named_query && $user->isLoggedIn()) {
       $save_button = id(new PHUIButtonView())
         ->setTag('a')
         ->setHref('/search/edit/key/'.$saved_query->getQueryKey().'/')
         ->setText(pht('Save Query'))
         ->setIcon('fa-floppy-o');
       $submit->addButton($save_button);
     }
 
     // TODO: A "Create Dashboard Panel" action goes here somewhere once
     // we sort out T5307.
 
     $form->appendChild($submit);
     $body = array();
 
     if ($this->getPreface()) {
       $body[] = $this->getPreface();
     }
 
     if ($named_query) {
       $title = $named_query->getQueryName();
     } else {
       $title = pht('Advanced Search');
     }
 
     $header = id(new PHUIHeaderView())
       ->setHeader($title)
       ->setProfileHeader(true);
 
     $box = id(new PHUIObjectBoxView())
       ->setHeader($header)
       ->addClass('application-search-results');
 
     if ($run_query || $named_query) {
       $box->setShowHide(
         pht('Edit Query'),
         pht('Hide Query'),
         $form,
         $this->getApplicationURI('query/advanced/?query='.$query_key),
         (!$named_query ? true : false));
     } else {
       $box->setForm($form);
     }
 
     $body[] = $box;
     $more_crumbs = null;
 
     if ($run_query) {
       $exec_errors = array();
 
       $box->setAnchor(
         id(new PhabricatorAnchorView())
           ->setAnchorName('R'));
 
       try {
         $engine->setRequest($request);
 
         $query = $engine->buildQueryFromSavedQuery($saved_query);
 
         $pager = $engine->newPagerForSavedQuery($saved_query);
         $pager->readFromRequest($request);
 
         $objects = $engine->executeQuery($query, $pager);
 
         $force_nux = $request->getBool('nux');
         if (!$objects || $force_nux) {
           $nux_view = $this->renderNewUserView($engine, $force_nux);
         } else {
           $nux_view = null;
         }
 
         $is_overflowing =
           $pager->willShowPagingControls() &&
           $engine->getResultBucket($saved_query);
 
         $force_overheated = $request->getBool('overheated');
         $is_overheated = $query->getIsOverheated() || $force_overheated;
 
         if ($nux_view) {
           $box->appendChild($nux_view);
         } else {
           $list = $engine->renderResults($objects, $saved_query);
 
           if (!($list instanceof PhabricatorApplicationSearchResultView)) {
             throw new Exception(
               pht(
                 'SearchEngines must render a "%s" object, but this engine '.
                 '(of class "%s") rendered something else.',
                 'PhabricatorApplicationSearchResultView',
                 get_class($engine)));
           }
 
           if ($list->getObjectList()) {
             $box->setObjectList($list->getObjectList());
           }
           if ($list->getTable()) {
             $box->setTable($list->getTable());
           }
           if ($list->getInfoView()) {
             $box->setInfoView($list->getInfoView());
           }
 
           if ($is_overflowing) {
             $box->appendChild($this->newOverflowingView());
           }
 
           if ($list->getContent()) {
             $box->appendChild($list->getContent());
           }
 
           if ($is_overheated) {
             $box->appendChild($this->newOverheatedView($objects));
           }
 
           $result_header = $list->getHeader();
           if ($result_header) {
             $box->setHeader($result_header);
             $header = $result_header;
           }
 
           $actions = $list->getActions();
           if ($actions) {
             foreach ($actions as $action) {
               $header->addActionLink($action);
             }
           }
 
           $use_actions = $engine->newUseResultsActions($saved_query);
 
           // TODO: Eventually, modularize all this stuff.
           $builtin_use_actions = $this->newBuiltinUseActions();
           if ($builtin_use_actions) {
             foreach ($builtin_use_actions as $builtin_use_action) {
               $use_actions[] = $builtin_use_action;
             }
           }
 
           if ($use_actions) {
             $use_dropdown = $this->newUseResultsDropdown(
               $saved_query,
               $use_actions);
             $header->addActionLink($use_dropdown);
           }
 
           $more_crumbs = $list->getCrumbs();
 
           if ($pager->willShowPagingControls()) {
             $pager_box = id(new PHUIBoxView())
               ->setColor(PHUIBoxView::GREY)
               ->addClass('application-search-pager')
               ->appendChild($pager);
             $body[] = $pager_box;
           }
         }
       } catch (PhabricatorTypeaheadInvalidTokenException $ex) {
         $exec_errors[] = pht(
           'This query specifies an invalid parameter. Review the '.
           'query parameters and correct errors.');
       } catch (PhutilSearchQueryCompilerSyntaxException $ex) {
         $exec_errors[] = $ex->getMessage();
       } catch (PhabricatorSearchConstraintException $ex) {
         $exec_errors[] = $ex->getMessage();
       }
 
       // The engine may have encountered additional errors during rendering;
       // merge them in and show everything.
       foreach ($engine->getErrors() as $error) {
         $exec_errors[] = $error;
       }
 
       $errors = $exec_errors;
     }
 
     if ($errors) {
       $box->setFormErrors($errors, pht('Query Errors'));
     }
 
     $crumbs = $parent
       ->buildApplicationCrumbs()
       ->setBorder(true);
 
     if ($more_crumbs) {
       $query_uri = $engine->getQueryResultsPageURI($saved_query->getQueryKey());
       $crumbs->addTextCrumb($title, $query_uri);
 
       foreach ($more_crumbs as $crumb) {
         $crumbs->addCrumb($crumb);
       }
     } else {
       $crumbs->addTextCrumb($title);
     }
 
     require_celerity_resource('application-search-view-css');
 
     return $this->newPage()
       ->setApplicationMenu($this->buildApplicationMenu())
       ->setTitle(pht('Query: %s', $title))
       ->setCrumbs($crumbs)
       ->setNavigation($nav)
       ->addClass('application-search-view')
       ->appendChild($body);
   }
 
   private function processExportRequest() {
     $viewer = $this->getViewer();
     $engine = $this->getSearchEngine();
     $request = $this->getRequest();
 
     if (!$this->canExport()) {
       return new Aphront404Response();
     }
 
     $query_key = $this->getQueryKey();
     if ($engine->isBuiltinQuery($query_key)) {
       $saved_query = $engine->buildSavedQueryFromBuiltin($query_key);
     } else if ($query_key) {
       $saved_query = id(new PhabricatorSavedQueryQuery())
         ->setViewer($viewer)
         ->withQueryKeys(array($query_key))
         ->executeOne();
     } else {
       $saved_query = null;
     }
 
     if (!$saved_query) {
       return new Aphront404Response();
     }
 
     $cancel_uri = $engine->getQueryResultsPageURI($query_key);
 
     $named_query = idx($engine->loadEnabledNamedQueries(), $query_key);
 
     if ($named_query) {
       $filename = $named_query->getQueryName();
     } else {
       $filename = $engine->getResultTypeDescription();
     }
     $filename = phutil_utf8_strtolower($filename);
     $filename = PhabricatorFile::normalizeFileName($filename);
 
     $formats = PhabricatorExportFormat::getAllEnabledExportFormats();
     $format_options = mpull($formats, 'getExportFormatName');
 
     $errors = array();
 
     $e_format = null;
     if ($request->isFormPost()) {
       $format_key = $request->getStr('format');
       $format = idx($formats, $format_key);
 
       if (!$format) {
         $e_format = pht('Invalid');
         $errors[] = pht('Choose a valid export format.');
       }
 
       if (!$errors) {
         $query = $engine->buildQueryFromSavedQuery($saved_query);
 
         // NOTE: We aren't reading the pager from the request. Exports always
         // affect the entire result set.
         $pager = $engine->newPagerForSavedQuery($saved_query);
         $pager->setPageSize(0x7FFFFFFF);
 
         $objects = $engine->executeQuery($query, $pager);
 
         $extension = $format->getFileExtension();
         $mime_type = $format->getMIMEContentType();
         $filename = $filename.'.'.$extension;
 
         $format = clone $format;
         $format->setViewer($viewer);
 
         $export_data = $engine->newExport($objects);
-
-        if (count($export_data) !== count($objects)) {
-          throw new Exception(
-            pht(
-              'Search engine exported the wrong number of objects, expected '.
-              '%s but got %s.',
-              phutil_count($objects),
-              phutil_count($export_data)));
-        }
-
         $objects = array_values($objects);
-        $export_data = array_values($export_data);
 
         $field_list = $engine->newExportFieldList();
         $field_list = mpull($field_list, null, 'getKey');
 
         for ($ii = 0; $ii < count($objects); $ii++) {
           $format->addObject($objects[$ii], $field_list, $export_data[$ii]);
         }
 
         $export_result = $format->newFileData();
 
         $file = PhabricatorFile::newFromFileData(
           $export_result,
           array(
             'name' => $filename,
             'authorPHID' => $viewer->getPHID(),
             'ttl.relative' => phutil_units('15 minutes in seconds'),
             'viewPolicy' => PhabricatorPolicies::POLICY_NOONE,
             'mime-type' => $mime_type,
           ));
 
         return $this->newDialog()
           ->setTitle(pht('Download Results'))
           ->appendParagraph(
             pht('Click the download button to download the exported data.'))
           ->addCancelButton($cancel_uri, pht('Done'))
           ->setSubmitURI($file->getDownloadURI())
           ->setDisableWorkflowOnSubmit(true)
           ->addSubmitButton(pht('Download Data'));
       }
     }
 
     $export_form = id(new AphrontFormView())
       ->setViewer($viewer)
       ->appendControl(
         id(new AphrontFormSelectControl())
           ->setName('format')
           ->setLabel(pht('Format'))
           ->setError($e_format)
           ->setOptions($format_options));
 
     return $this->newDialog()
       ->setTitle(pht('Export Results'))
       ->setErrors($errors)
       ->appendForm($export_form)
       ->addCancelButton($cancel_uri)
       ->addSubmitButton(pht('Continue'));
   }
 
   private function processEditRequest() {
     $parent = $this->getDelegatingController();
     $request = $this->getRequest();
     $viewer = $request->getUser();
     $engine = $this->getSearchEngine();
 
     $nav = $this->getNavigation();
     if (!$nav) {
       $nav = $this->buildNavigation();
     }
 
     $named_queries = $engine->loadAllNamedQueries();
 
     $can_global = $viewer->getIsAdmin();
 
     $groups = array(
       'personal' => array(
         'name' => pht('Personal Saved Queries'),
         'items' => array(),
         'edit' => true,
       ),
       'global' => array(
         'name' => pht('Global Saved Queries'),
         'items' => array(),
         'edit' => $can_global,
       ),
     );
 
     foreach ($named_queries as $named_query) {
       if ($named_query->isGlobal()) {
         $group = 'global';
       } else {
         $group = 'personal';
       }
 
       $groups[$group]['items'][] = $named_query;
     }
 
     $default_key = $engine->getDefaultQueryKey();
 
     $lists = array();
     foreach ($groups as $group) {
       $lists[] = $this->newQueryListView(
         $group['name'],
         $group['items'],
         $default_key,
         $group['edit']);
     }
 
     $crumbs = $parent
       ->buildApplicationCrumbs()
       ->addTextCrumb(pht('Saved Queries'), $engine->getQueryManagementURI())
       ->setBorder(true);
 
     $nav->selectFilter('query/edit');
 
     $header = id(new PHUIHeaderView())
       ->setHeader(pht('Saved Queries'))
       ->setProfileHeader(true);
 
     $view = id(new PHUITwoColumnView())
       ->setHeader($header)
       ->setFooter($lists);
 
     return $this->newPage()
       ->setApplicationMenu($this->buildApplicationMenu())
       ->setTitle(pht('Saved Queries'))
       ->setCrumbs($crumbs)
       ->setNavigation($nav)
       ->appendChild($view);
   }
 
   private function newQueryListView(
     $list_name,
     array $named_queries,
     $default_key,
     $can_edit) {
 
     $engine = $this->getSearchEngine();
     $viewer = $this->getViewer();
 
     $list = id(new PHUIObjectItemListView())
       ->setViewer($viewer);
 
     if ($can_edit) {
       $list_id = celerity_generate_unique_node_id();
       $list->setID($list_id);
 
       Javelin::initBehavior(
         'search-reorder-queries',
         array(
           'listID' => $list_id,
           'orderURI' => '/search/order/'.get_class($engine).'/',
         ));
     }
 
     foreach ($named_queries as $named_query) {
       $class = get_class($engine);
       $key = $named_query->getQueryKey();
 
       $item = id(new PHUIObjectItemView())
         ->setHeader($named_query->getQueryName())
         ->setHref($engine->getQueryResultsPageURI($key));
 
       if ($named_query->getIsDisabled()) {
         if ($can_edit) {
           $item->setDisabled(true);
         } else {
           // If an item is disabled and you don't have permission to edit it,
           // just skip it.
           continue;
         }
       }
 
       if ($can_edit) {
         if ($named_query->getIsBuiltin() && $named_query->getIsDisabled()) {
           $icon = 'fa-plus';
           $disable_name = pht('Enable');
         } else {
           $icon = 'fa-times';
           if ($named_query->getIsBuiltin()) {
             $disable_name = pht('Disable');
           } else {
             $disable_name = pht('Delete');
           }
         }
 
         if ($named_query->getID()) {
           $disable_href = '/search/delete/id/'.$named_query->getID().'/';
         } else {
           $disable_href = '/search/delete/key/'.$key.'/'.$class.'/';
         }
 
         $item->addAction(
           id(new PHUIListItemView())
             ->setIcon($icon)
             ->setHref($disable_href)
             ->setRenderNameAsTooltip(true)
             ->setName($disable_name)
             ->setWorkflow(true));
       }
 
       $default_disabled = $named_query->getIsDisabled();
       $default_icon = 'fa-thumb-tack';
 
       if ($default_key === $key) {
         $default_color = 'green';
       } else {
         $default_color = null;
       }
 
       $item->addAction(
         id(new PHUIListItemView())
           ->setIcon("{$default_icon} {$default_color}")
           ->setHref('/search/default/'.$key.'/'.$class.'/')
           ->setRenderNameAsTooltip(true)
           ->setName(pht('Make Default'))
           ->setWorkflow(true)
           ->setDisabled($default_disabled));
 
       if ($can_edit) {
         if ($named_query->getIsBuiltin()) {
           $edit_icon = 'fa-lock lightgreytext';
           $edit_disabled = true;
           $edit_name = pht('Builtin');
           $edit_href = null;
         } else {
           $edit_icon = 'fa-pencil';
           $edit_disabled = false;
           $edit_name = pht('Edit');
           $edit_href = '/search/edit/id/'.$named_query->getID().'/';
         }
 
         $item->addAction(
           id(new PHUIListItemView())
             ->setIcon($edit_icon)
             ->setHref($edit_href)
             ->setRenderNameAsTooltip(true)
             ->setName($edit_name)
             ->setDisabled($edit_disabled));
       }
 
       $item->setGrippable($can_edit);
       $item->addSigil('named-query');
       $item->setMetadata(
         array(
           'queryKey' => $named_query->getQueryKey(),
         ));
 
       $list->addItem($item);
     }
 
     $list->setNoDataString(pht('No saved queries.'));
 
     return id(new PHUIObjectBoxView())
       ->setHeaderText($list_name)
       ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
       ->setObjectList($list);
   }
 
   public function buildApplicationMenu() {
     $menu = $this->getDelegatingController()
       ->buildApplicationMenu();
 
     if ($menu instanceof PHUIApplicationMenuView) {
       $menu->setSearchEngine($this->getSearchEngine());
     }
 
     return $menu;
   }
 
   private function buildNavigation() {
     $viewer = $this->getViewer();
     $engine = $this->getSearchEngine();
 
     $nav = id(new AphrontSideNavFilterView())
       ->setUser($viewer)
       ->setBaseURI(new PhutilURI($this->getApplicationURI()));
 
     $engine->addNavigationItems($nav->getMenu());
 
     return $nav;
   }
 
   private function renderNewUserView(
     PhabricatorApplicationSearchEngine $engine,
     $force_nux) {
 
     // Don't render NUX if the user has clicked away from the default page.
     if (strlen($this->getQueryKey())) {
       return null;
     }
 
     // Don't put NUX in panels because it would be weird.
     if ($engine->isPanelContext()) {
       return null;
     }
 
     // Try to render the view itself first, since this should be very cheap
     // (just returning some text).
     $nux_view = $engine->renderNewUserView();
 
     if (!$nux_view) {
       return null;
     }
 
     $query = $engine->newQuery();
     if (!$query) {
       return null;
     }
 
     // Try to load any object at all. If we can, the application has seen some
     // use so we just render the normal view.
     if (!$force_nux) {
       $object = $query
         ->setViewer(PhabricatorUser::getOmnipotentUser())
         ->setLimit(1)
         ->execute();
       if ($object) {
         return null;
       }
     }
 
     return $nux_view;
   }
 
   private function newUseResultsDropdown(
     PhabricatorSavedQuery $query,
     array $dropdown_items) {
 
     $viewer = $this->getViewer();
 
     $action_list = id(new PhabricatorActionListView())
       ->setViewer($viewer);
     foreach ($dropdown_items as $dropdown_item) {
       $action_list->addAction($dropdown_item);
     }
 
     return id(new PHUIButtonView())
       ->setTag('a')
       ->setHref('#')
       ->setText(pht('Use Results'))
       ->setIcon('fa-bars')
       ->setDropdownMenu($action_list)
       ->addClass('dropdown');
   }
 
   private function newOverflowingView() {
     $message = pht(
       'The query matched more than one page of results. Results are '.
       'paginated before bucketing, so later pages may contain additional '.
       'results in any bucket.');
 
     return id(new PHUIInfoView())
       ->setSeverity(PHUIInfoView::SEVERITY_WARNING)
       ->setFlush(true)
       ->setTitle(pht('Buckets Overflowing'))
       ->setErrors(
         array(
           $message,
         ));
   }
 
   private function newOverheatedView(array $results) {
     if ($results) {
       $message = pht(
         'Most objects matching your query are not visible to you, so '.
         'filtering results is taking a long time. Only some results are '.
         'shown. Refine your query to find results more quickly.');
     } else {
       $message = pht(
         'Most objects matching your query are not visible to you, so '.
         'filtering results is taking a long time. Refine your query to '.
         'find results more quickly.');
     }
 
     return id(new PHUIInfoView())
       ->setSeverity(PHUIInfoView::SEVERITY_WARNING)
       ->setFlush(true)
       ->setTitle(pht('Query Overheated'))
       ->setErrors(
         array(
           $message,
         ));
   }
 
   private function newBuiltinUseActions() {
     $actions = array();
     $request = $this->getRequest();
     $viewer = $request->getUser();
 
     $is_dev = PhabricatorEnv::getEnvConfig('phabricator.developer-mode');
 
     $engine = $this->getSearchEngine();
     $engine_class = get_class($engine);
     $query_key = $this->getQueryKey();
     if (!$query_key) {
       $query_key = $engine->getDefaultQueryKey();
     }
 
     $can_use = $engine->canUseInPanelContext();
     $is_installed = PhabricatorApplication::isClassInstalledForViewer(
       'PhabricatorDashboardApplication',
       $viewer);
 
     if ($can_use && $is_installed) {
       $actions[] = id(new PhabricatorActionView())
         ->setIcon('fa-dashboard')
         ->setName(pht('Add to Dashboard'))
         ->setWorkflow(true)
         ->setHref("/dashboard/panel/install/{$engine_class}/{$query_key}/");
     }
 
     if ($this->canExport()) {
       $export_uri = $engine->getExportURI($query_key);
       $actions[] = id(new PhabricatorActionView())
         ->setIcon('fa-download')
         ->setName(pht('Export Data'))
         ->setWorkflow(true)
         ->setHref($export_uri);
     }
 
     if ($is_dev) {
       $engine = $this->getSearchEngine();
       $nux_uri = $engine->getQueryBaseURI();
       $nux_uri = id(new PhutilURI($nux_uri))
         ->setQueryParam('nux', true);
 
       $actions[] = id(new PhabricatorActionView())
         ->setIcon('fa-user-plus')
         ->setName(pht('DEV: New User State'))
         ->setHref($nux_uri);
     }
 
     if ($is_dev) {
       $overheated_uri = $this->getRequest()->getRequestURI()
         ->setQueryParam('overheated', true);
 
       $actions[] = id(new PhabricatorActionView())
         ->setIcon('fa-fire')
         ->setName(pht('DEV: Overheated State'))
         ->setHref($overheated_uri);
     }
 
     return $actions;
   }
 
   private function canExport() {
     $engine = $this->getSearchEngine();
     if (!$engine->canExport()) {
       return false;
     }
 
     // Don't allow logged-out users to perform exports. There's no technical
     // or policy reason they can't, but we don't normally give them access
     // to write files or jobs. For now, just err on the side of caution.
 
     $viewer = $this->getViewer();
     if (!$viewer->getPHID()) {
       return false;
     }
 
     return true;
   }
 
 }
diff --git a/src/applications/search/engine/PhabricatorApplicationSearchEngine.php b/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
index 33efd890bb..e77c06a62b 100644
--- a/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
+++ b/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
@@ -1,1465 +1,1528 @@
 <?php
 
 /**
  * Represents an abstract search engine for an application. It supports
  * creating and storing saved queries.
  *
  * @task construct  Constructing Engines
  * @task app        Applications
  * @task builtin    Builtin Queries
  * @task uri        Query URIs
  * @task dates      Date Filters
  * @task order      Result Ordering
  * @task read       Reading Utilities
  * @task exec       Paging and Executing Queries
  * @task render     Rendering Results
  */
 abstract class PhabricatorApplicationSearchEngine extends Phobject {
 
   private $application;
   private $viewer;
   private $errors = array();
   private $request;
   private $context;
   private $controller;
   private $namedQueries;
   private $navigationItems = array();
 
   const CONTEXT_LIST  = 'list';
   const CONTEXT_PANEL = 'panel';
 
   const BUCKET_NONE = 'none';
 
   public function setController(PhabricatorController $controller) {
     $this->controller = $controller;
     return $this;
   }
 
   public function getController() {
     return $this->controller;
   }
 
   public function buildResponse() {
     $controller = $this->getController();
     $request = $controller->getRequest();
 
     $search = id(new PhabricatorApplicationSearchController())
       ->setQueryKey($request->getURIData('queryKey'))
       ->setSearchEngine($this);
 
     return $controller->delegateToController($search);
   }
 
   public function newResultObject() {
     // We may be able to get this automatically if newQuery() is implemented.
     $query = $this->newQuery();
     if ($query) {
       $object = $query->newResultObject();
       if ($object) {
         return $object;
       }
     }
 
     return null;
   }
 
   public function newQuery() {
     return null;
   }
 
   public function setViewer(PhabricatorUser $viewer) {
     $this->viewer = $viewer;
     return $this;
   }
 
   protected function requireViewer() {
     if (!$this->viewer) {
       throw new PhutilInvalidStateException('setViewer');
     }
     return $this->viewer;
   }
 
   public function setContext($context) {
     $this->context = $context;
     return $this;
   }
 
   public function isPanelContext() {
     return ($this->context == self::CONTEXT_PANEL);
   }
 
   public function setNavigationItems(array $navigation_items) {
     assert_instances_of($navigation_items, 'PHUIListItemView');
     $this->navigationItems = $navigation_items;
     return $this;
   }
 
   public function getNavigationItems() {
     return $this->navigationItems;
   }
 
   public function canUseInPanelContext() {
     return true;
   }
 
   public function saveQuery(PhabricatorSavedQuery $query) {
     $query->setEngineClassName(get_class($this));
 
     $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
     try {
       $query->save();
     } catch (AphrontDuplicateKeyQueryException $ex) {
       // Ignore, this is just a repeated search.
     }
     unset($unguarded);
   }
 
   /**
    * Create a saved query object from the request.
    *
    * @param AphrontRequest The search request.
    * @return PhabricatorSavedQuery
    */
   public function buildSavedQueryFromRequest(AphrontRequest $request) {
     $fields = $this->buildSearchFields();
     $viewer = $this->requireViewer();
 
     $saved = new PhabricatorSavedQuery();
     foreach ($fields as $field) {
       $field->setViewer($viewer);
 
       $value = $field->readValueFromRequest($request);
       $saved->setParameter($field->getKey(), $value);
     }
 
     return $saved;
   }
 
   /**
    * Executes the saved query.
    *
    * @param PhabricatorSavedQuery The saved query to operate on.
    * @return PhabricatorQuery The result of the query.
    */
   public function buildQueryFromSavedQuery(PhabricatorSavedQuery $original) {
     $saved = clone $original;
     $this->willUseSavedQuery($saved);
 
     $fields = $this->buildSearchFields();
     $viewer = $this->requireViewer();
 
     $map = array();
     foreach ($fields as $field) {
       $field->setViewer($viewer);
       $field->readValueFromSavedQuery($saved);
       $value = $field->getValueForQuery($field->getValue());
       $map[$field->getKey()] = $value;
     }
 
     $original->attachParameterMap($map);
     $query = $this->buildQueryFromParameters($map);
 
     $object = $this->newResultObject();
     if (!$object) {
       return $query;
     }
 
     $extensions = $this->getEngineExtensions();
     foreach ($extensions as $extension) {
       $extension->applyConstraintsToQuery($object, $query, $saved, $map);
     }
 
     $order = $saved->getParameter('order');
     $builtin = $query->getBuiltinOrderAliasMap();
     if (strlen($order) && isset($builtin[$order])) {
       $query->setOrder($order);
     } else {
       // If the order is invalid or not available, we choose the first
       // builtin order. This isn't always the default order for the query,
       // but is the first value in the "Order" dropdown, and makes the query
       // behavior more consistent with the UI. In queries where the two
       // orders differ, this order is the preferred order for humans.
       $query->setOrder(head_key($builtin));
     }
 
     return $query;
   }
 
   /**
    * Hook for subclasses to adjust saved queries prior to use.
    *
    * If an application changes how queries are saved, it can implement this
    * hook to keep old queries working the way users expect, by reading,
    * adjusting, and overwriting parameters.
    *
    * @param PhabricatorSavedQuery Saved query which will be executed.
    * @return void
    */
   protected function willUseSavedQuery(PhabricatorSavedQuery $saved) {
     return;
   }
 
   protected function buildQueryFromParameters(array $parameters) {
     throw new PhutilMethodNotImplementedException();
   }
 
   /**
    * Builds the search form using the request.
    *
    * @param AphrontFormView       Form to populate.
    * @param PhabricatorSavedQuery The query from which to build the form.
    * @return void
    */
   public function buildSearchForm(
     AphrontFormView $form,
     PhabricatorSavedQuery $saved) {
 
     $saved = clone $saved;
     $this->willUseSavedQuery($saved);
 
     $fields = $this->buildSearchFields();
     $fields = $this->adjustFieldsForDisplay($fields);
     $viewer = $this->requireViewer();
 
     foreach ($fields as $field) {
       $field->setViewer($viewer);
       $field->readValueFromSavedQuery($saved);
     }
 
     foreach ($fields as $field) {
       foreach ($field->getErrors() as $error) {
         $this->addError(last($error));
       }
     }
 
     foreach ($fields as $field) {
       $field->appendToForm($form);
     }
   }
 
   protected function buildSearchFields() {
     $fields = array();
 
     foreach ($this->buildCustomSearchFields() as $field) {
       $fields[] = $field;
     }
 
     $object = $this->newResultObject();
     if ($object) {
       $extensions = $this->getEngineExtensions();
       foreach ($extensions as $extension) {
         $extension_fields = $extension->getSearchFields($object);
         foreach ($extension_fields as $extension_field) {
           $fields[] = $extension_field;
         }
       }
     }
 
     $query = $this->newQuery();
     if ($query && $this->shouldShowOrderField()) {
       $orders = $query->getBuiltinOrders();
       $orders = ipull($orders, 'name');
 
       $fields[] = id(new PhabricatorSearchOrderField())
         ->setLabel(pht('Order By'))
         ->setKey('order')
         ->setOrderAliases($query->getBuiltinOrderAliasMap())
         ->setOptions($orders);
     }
 
     $buckets = $this->newResultBuckets();
     if ($query && $buckets) {
       $bucket_options = array(
         self::BUCKET_NONE => pht('No Bucketing'),
       ) + mpull($buckets, 'getResultBucketName');
 
       $fields[] = id(new PhabricatorSearchSelectField())
         ->setLabel(pht('Bucket'))
         ->setKey('bucket')
         ->setOptions($bucket_options);
     }
 
     $field_map = array();
     foreach ($fields as $field) {
       $key = $field->getKey();
       if (isset($field_map[$key])) {
         throw new Exception(
           pht(
             'Two fields in this SearchEngine use the same key ("%s"), but '.
             'each field must use a unique key.',
             $key));
       }
       $field_map[$key] = $field;
     }
 
     return $field_map;
   }
 
   protected function shouldShowOrderField() {
     return true;
   }
 
   private function adjustFieldsForDisplay(array $field_map) {
     $order = $this->getDefaultFieldOrder();
 
     $head_keys = array();
     $tail_keys = array();
     $seen_tail = false;
     foreach ($order as $order_key) {
       if ($order_key === '...') {
         $seen_tail = true;
         continue;
       }
 
       if (!$seen_tail) {
         $head_keys[] = $order_key;
       } else {
         $tail_keys[] = $order_key;
       }
     }
 
     $head = array_select_keys($field_map, $head_keys);
     $body = array_diff_key($field_map, array_fuse($tail_keys));
     $tail = array_select_keys($field_map, $tail_keys);
 
     $result = $head + $body + $tail;
 
     // Force the fulltext "query" field to the top unconditionally.
     $result = array_select_keys($result, array('query')) + $result;
 
     foreach ($this->getHiddenFields() as $hidden_key) {
       unset($result[$hidden_key]);
     }
 
     return $result;
   }
 
   protected function buildCustomSearchFields() {
     throw new PhutilMethodNotImplementedException();
   }
 
 
   /**
    * Define the default display order for fields by returning a list of
    * field keys.
    *
    * You can use the special key `...` to mean "all unspecified fields go
    * here". This lets you easily put important fields at the top of the form,
    * standard fields in the middle of the form, and less important fields at
    * the bottom.
    *
    * For example, you might return a list like this:
    *
    *   return array(
    *     'authorPHIDs',
    *     'reviewerPHIDs',
    *     '...',
    *     'createdAfter',
    *     'createdBefore',
    *   );
    *
    * Any unspecified fields (including custom fields and fields added
    * automatically by infrastructure) will be put in the middle.
    *
    * @return list<string> Default ordering for field keys.
    */
   protected function getDefaultFieldOrder() {
     return array();
   }
 
   /**
    * Return a list of field keys which should be hidden from the viewer.
    *
     * @return list<string> Fields to hide.
    */
   protected function getHiddenFields() {
     return array();
   }
 
   public function getErrors() {
     return $this->errors;
   }
 
   public function addError($error) {
     $this->errors[] = $error;
     return $this;
   }
 
   /**
    * Return an application URI corresponding to the results page of a query.
    * Normally, this is something like `/application/query/QUERYKEY/`.
    *
    * @param   string  The query key to build a URI for.
    * @return  string  URI where the query can be executed.
    * @task uri
    */
   public function getQueryResultsPageURI($query_key) {
     return $this->getURI('query/'.$query_key.'/');
   }
 
 
   /**
    * Return an application URI for query management. This is used when, e.g.,
    * a query deletion operation is cancelled.
    *
    * @return  string  URI where queries can be managed.
    * @task uri
    */
   public function getQueryManagementURI() {
     return $this->getURI('query/edit/');
   }
 
   public function getQueryBaseURI() {
     return $this->getURI('');
   }
 
   public function getExportURI($query_key) {
     return $this->getURI('query/'.$query_key.'/export/');
   }
 
 
   /**
    * Return the URI to a path within the application. Used to construct default
    * URIs for management and results.
    *
    * @return string URI to path.
    * @task uri
    */
   abstract protected function getURI($path);
 
 
   /**
    * Return a human readable description of the type of objects this query
    * searches for.
    *
    * For example, "Tasks" or "Commits".
    *
    * @return string Human-readable description of what this engine is used to
    *   find.
    */
   abstract public function getResultTypeDescription();
 
 
   public function newSavedQuery() {
     return id(new PhabricatorSavedQuery())
       ->setEngineClassName(get_class($this));
   }
 
   public function addNavigationItems(PHUIListView $menu) {
     $viewer = $this->requireViewer();
 
     $menu->newLabel(pht('Queries'));
 
     $named_queries = $this->loadEnabledNamedQueries();
 
     foreach ($named_queries as $query) {
       $key = $query->getQueryKey();
       $uri = $this->getQueryResultsPageURI($key);
       $menu->newLink($query->getQueryName(), $uri, 'query/'.$key);
     }
 
     if ($viewer->isLoggedIn()) {
       $manage_uri = $this->getQueryManagementURI();
       $menu->newLink(pht('Edit Queries...'), $manage_uri, 'query/edit');
     }
 
     $menu->newLabel(pht('Search'));
     $advanced_uri = $this->getQueryResultsPageURI('advanced');
     $menu->newLink(pht('Advanced Search'), $advanced_uri, 'query/advanced');
 
     foreach ($this->navigationItems as $extra_item) {
       $menu->addMenuItem($extra_item);
     }
 
     return $this;
   }
 
   public function loadAllNamedQueries() {
     $viewer = $this->requireViewer();
     $builtin = $this->getBuiltinQueries();
 
     if ($this->namedQueries === null) {
       $named_queries = id(new PhabricatorNamedQueryQuery())
         ->setViewer($viewer)
         ->withEngineClassNames(array(get_class($this)))
         ->withUserPHIDs(
           array(
             $viewer->getPHID(),
             PhabricatorNamedQuery::SCOPE_GLOBAL,
           ))
         ->execute();
       $named_queries = mpull($named_queries, null, 'getQueryKey');
 
       $builtin = mpull($builtin, null, 'getQueryKey');
 
       foreach ($named_queries as $key => $named_query) {
         if ($named_query->getIsBuiltin()) {
           if (isset($builtin[$key])) {
             $named_queries[$key]->setQueryName($builtin[$key]->getQueryName());
             unset($builtin[$key]);
           } else {
             unset($named_queries[$key]);
           }
         }
 
         unset($builtin[$key]);
       }
 
       $named_queries = msortv($named_queries, 'getNamedQuerySortVector');
       $this->namedQueries = $named_queries;
     }
 
     return $this->namedQueries + $builtin;
   }
 
   public function loadEnabledNamedQueries() {
     $named_queries = $this->loadAllNamedQueries();
     foreach ($named_queries as $key => $named_query) {
       if ($named_query->getIsBuiltin() && $named_query->getIsDisabled()) {
         unset($named_queries[$key]);
       }
     }
     return $named_queries;
   }
 
   public function getDefaultQueryKey() {
     $viewer = $this->requireViewer();
 
     $configs = id(new PhabricatorNamedQueryConfigQuery())
       ->setViewer($viewer)
       ->withEngineClassNames(array(get_class($this)))
       ->withScopePHIDs(
         array(
           $viewer->getPHID(),
           PhabricatorNamedQueryConfig::SCOPE_GLOBAL,
         ))
       ->execute();
     $configs = msortv($configs, 'getStrengthSortVector');
 
     $key_pinned = PhabricatorNamedQueryConfig::PROPERTY_PINNED;
     $map = $this->loadEnabledNamedQueries();
     foreach ($configs as $config) {
       $pinned = $config->getConfigProperty($key_pinned);
       if (!isset($map[$pinned])) {
         continue;
       }
 
       return $pinned;
     }
 
     return head_key($map);
   }
 
   protected function setQueryProjects(
     PhabricatorCursorPagedPolicyAwareQuery $query,
     PhabricatorSavedQuery $saved) {
 
     $datasource = id(new PhabricatorProjectLogicalDatasource())
       ->setViewer($this->requireViewer());
 
     $projects = $saved->getParameter('projects', array());
     $constraints = $datasource->evaluateTokens($projects);
 
     if ($constraints) {
       $query->withEdgeLogicConstraints(
         PhabricatorProjectObjectHasProjectEdgeType::EDGECONST,
         $constraints);
     }
 
     return $this;
   }
 
 
 /* -(  Applications  )------------------------------------------------------- */
 
 
   protected function getApplicationURI($path = '') {
     return $this->getApplication()->getApplicationURI($path);
   }
 
   protected function getApplication() {
     if (!$this->application) {
       $class = $this->getApplicationClassName();
 
       $this->application = id(new PhabricatorApplicationQuery())
         ->setViewer($this->requireViewer())
         ->withClasses(array($class))
         ->withInstalled(true)
         ->executeOne();
 
       if (!$this->application) {
         throw new Exception(
           pht(
             'Application "%s" is not installed!',
             $class));
       }
     }
 
     return $this->application;
   }
 
   abstract public function getApplicationClassName();
 
 
 /* -(  Constructing Engines  )----------------------------------------------- */
 
 
   /**
    * Load all available application search engines.
    *
    * @return list<PhabricatorApplicationSearchEngine> All available engines.
    * @task construct
    */
   public static function getAllEngines() {
     return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
       ->execute();
   }
 
 
   /**
    * Get an engine by class name, if it exists.
    *
    * @return PhabricatorApplicationSearchEngine|null Engine, or null if it does
    *   not exist.
    * @task construct
    */
   public static function getEngineByClassName($class_name) {
     return idx(self::getAllEngines(), $class_name);
   }
 
 
 /* -(  Builtin Queries  )---------------------------------------------------- */
 
 
   /**
    * @task builtin
    */
   public function getBuiltinQueries() {
     $names = $this->getBuiltinQueryNames();
 
     $queries = array();
     $sequence = 0;
     foreach ($names as $key => $name) {
       $queries[$key] = id(new PhabricatorNamedQuery())
         ->setUserPHID(PhabricatorNamedQuery::SCOPE_GLOBAL)
         ->setEngineClassName(get_class($this))
         ->setQueryName($name)
         ->setQueryKey($key)
         ->setSequence((1 << 24) + $sequence++)
         ->setIsBuiltin(true);
     }
 
     return $queries;
   }
 
 
   /**
    * @task builtin
    */
   public function getBuiltinQuery($query_key) {
     if (!$this->isBuiltinQuery($query_key)) {
       throw new Exception(pht("'%s' is not a builtin!", $query_key));
     }
     return idx($this->getBuiltinQueries(), $query_key);
   }
 
 
   /**
    * @task builtin
    */
   protected function getBuiltinQueryNames() {
     return array();
   }
 
 
   /**
    * @task builtin
    */
   public function isBuiltinQuery($query_key) {
     $builtins = $this->getBuiltinQueries();
     return isset($builtins[$query_key]);
   }
 
 
   /**
    * @task builtin
    */
   public function buildSavedQueryFromBuiltin($query_key) {
     throw new Exception(pht("Builtin '%s' is not supported!", $query_key));
   }
 
 
 /* -(  Reading Utilities )--------------------------------------------------- */
 
 
   /**
    * Read a list of user PHIDs from a request in a flexible way. This method
    * supports either of these forms:
    *
    *   users[]=alincoln&users[]=htaft
    *   users=alincoln,htaft
    *
    * Additionally, users can be specified either by PHID or by name.
    *
    * The main goal of this flexibility is to allow external programs to generate
    * links to pages (like "alincoln's open revisions") without needing to make
    * API calls.
    *
    * @param AphrontRequest  Request to read user PHIDs from.
    * @param string          Key to read in the request.
    * @param list<const>     Other permitted PHID types.
    * @return list<phid>     List of user PHIDs and selector functions.
    * @task read
    */
   protected function readUsersFromRequest(
     AphrontRequest $request,
     $key,
     array $allow_types = array()) {
 
     $list = $this->readListFromRequest($request, $key);
 
     $phids = array();
     $names = array();
     $allow_types = array_fuse($allow_types);
     $user_type = PhabricatorPeopleUserPHIDType::TYPECONST;
     foreach ($list as $item) {
       $type = phid_get_type($item);
       if ($type == $user_type) {
         $phids[] = $item;
       } else if (isset($allow_types[$type])) {
         $phids[] = $item;
       } else {
         if (PhabricatorTypeaheadDatasource::isFunctionToken($item)) {
           // If this is a function, pass it through unchanged; we'll evaluate
           // it later.
           $phids[] = $item;
         } else {
           $names[] = $item;
         }
       }
     }
 
     if ($names) {
       $users = id(new PhabricatorPeopleQuery())
         ->setViewer($this->requireViewer())
         ->withUsernames($names)
         ->execute();
       foreach ($users as $user) {
         $phids[] = $user->getPHID();
       }
       $phids = array_unique($phids);
     }
 
     return $phids;
   }
 
 
   /**
    * Read a list of subscribers from a request in a flexible way.
    *
    * @param AphrontRequest  Request to read PHIDs from.
    * @param string          Key to read in the request.
    * @return list<phid>     List of object PHIDs.
    * @task read
    */
   protected function readSubscribersFromRequest(
     AphrontRequest $request,
     $key) {
     return $this->readUsersFromRequest(
       $request,
       $key,
       array(
         PhabricatorProjectProjectPHIDType::TYPECONST,
       ));
   }
 
 
   /**
    * Read a list of generic PHIDs from a request in a flexible way. Like
    * @{method:readUsersFromRequest}, this method supports either array or
    * comma-delimited forms. Objects can be specified either by PHID or by
    * object name.
    *
    * @param AphrontRequest  Request to read PHIDs from.
    * @param string          Key to read in the request.
    * @param list<const>     Optional, list of permitted PHID types.
    * @return list<phid>     List of object PHIDs.
    *
    * @task read
    */
   protected function readPHIDsFromRequest(
     AphrontRequest $request,
     $key,
     array $allow_types = array()) {
 
     $list = $this->readListFromRequest($request, $key);
 
     $objects = id(new PhabricatorObjectQuery())
       ->setViewer($this->requireViewer())
       ->withNames($list)
       ->execute();
     $list = mpull($objects, 'getPHID');
 
     if (!$list) {
       return array();
     }
 
     // If only certain PHID types are allowed, filter out all the others.
     if ($allow_types) {
       $allow_types = array_fuse($allow_types);
       foreach ($list as $key => $phid) {
         if (empty($allow_types[phid_get_type($phid)])) {
           unset($list[$key]);
         }
       }
     }
 
     return $list;
   }
 
 
   /**
    * Read a list of items from the request, in either array format or string
    * format:
    *
    *   list[]=item1&list[]=item2
    *   list=item1,item2
    *
    * This provides flexibility when constructing URIs, especially from external
    * sources.
    *
    * @param AphrontRequest  Request to read strings from.
    * @param string          Key to read in the request.
    * @return list<string>   List of values.
    */
   protected function readListFromRequest(
     AphrontRequest $request,
     $key) {
     $list = $request->getArr($key, null);
     if ($list === null) {
       $list = $request->getStrList($key);
     }
 
     if (!$list) {
       return array();
     }
 
     return $list;
   }
 
   protected function readBoolFromRequest(
     AphrontRequest $request,
     $key) {
     if (!strlen($request->getStr($key))) {
       return null;
     }
     return $request->getBool($key);
   }
 
 
   protected function getBoolFromQuery(PhabricatorSavedQuery $query, $key) {
     $value = $query->getParameter($key);
     if ($value === null) {
       return $value;
     }
     return $value ? 'true' : 'false';
   }
 
 
 /* -(  Dates  )-------------------------------------------------------------- */
 
 
   /**
    * @task dates
    */
   protected function parseDateTime($date_time) {
     if (!strlen($date_time)) {
       return null;
     }
 
     return PhabricatorTime::parseLocalTime($date_time, $this->requireViewer());
   }
 
 
   /**
    * @task dates
    */
   protected function buildDateRange(
     AphrontFormView $form,
     PhabricatorSavedQuery $saved_query,
     $start_key,
     $start_name,
     $end_key,
     $end_name) {
 
     $start_str = $saved_query->getParameter($start_key);
     $start = null;
     if (strlen($start_str)) {
       $start = $this->parseDateTime($start_str);
       if (!$start) {
         $this->addError(
           pht(
             '"%s" date can not be parsed.',
             $start_name));
       }
     }
 
 
     $end_str = $saved_query->getParameter($end_key);
     $end = null;
     if (strlen($end_str)) {
       $end = $this->parseDateTime($end_str);
       if (!$end) {
         $this->addError(
           pht(
             '"%s" date can not be parsed.',
             $end_name));
       }
     }
 
     if ($start && $end && ($start >= $end)) {
       $this->addError(
         pht(
           '"%s" must be a date before "%s".',
           $start_name,
           $end_name));
     }
 
     $form
       ->appendChild(
         id(new PHUIFormFreeformDateControl())
           ->setName($start_key)
           ->setLabel($start_name)
           ->setValue($start_str))
       ->appendChild(
         id(new AphrontFormTextControl())
           ->setName($end_key)
           ->setLabel($end_name)
           ->setValue($end_str));
   }
 
 
 /* -(  Paging and Executing Queries  )--------------------------------------- */
 
 
   protected function newResultBuckets() {
     return array();
   }
 
   public function getResultBucket(PhabricatorSavedQuery $saved) {
     $key = $saved->getParameter('bucket');
     if ($key == self::BUCKET_NONE) {
       return null;
     }
 
     $buckets = $this->newResultBuckets();
     return idx($buckets, $key);
   }
 
 
   public function getPageSize(PhabricatorSavedQuery $saved) {
     $bucket = $this->getResultBucket($saved);
 
     $limit = (int)$saved->getParameter('limit');
 
     if ($limit > 0) {
       if ($bucket) {
         $bucket->setPageSize($limit);
       }
       return $limit;
     }
 
     if ($bucket) {
       return $bucket->getPageSize();
     }
 
     return 100;
   }
 
 
   public function shouldUseOffsetPaging() {
     return false;
   }
 
 
   public function newPagerForSavedQuery(PhabricatorSavedQuery $saved) {
     if ($this->shouldUseOffsetPaging()) {
       $pager = new PHUIPagerView();
     } else {
       $pager = new AphrontCursorPagerView();
     }
 
     $page_size = $this->getPageSize($saved);
     if (is_finite($page_size)) {
       $pager->setPageSize($page_size);
     } else {
       // Consider an INF pagesize to mean a large finite pagesize.
 
       // TODO: It would be nice to handle this more gracefully, but math
       // with INF seems to vary across PHP versions, systems, and runtimes.
       $pager->setPageSize(0xFFFF);
     }
 
     return $pager;
   }
 
 
   public function executeQuery(
     PhabricatorPolicyAwareQuery $query,
     AphrontView $pager) {
 
     $query->setViewer($this->requireViewer());
 
     if ($this->shouldUseOffsetPaging()) {
       $objects = $query->executeWithOffsetPager($pager);
     } else {
       $objects = $query->executeWithCursorPager($pager);
     }
 
     $this->didExecuteQuery($query);
 
     return $objects;
   }
 
   protected function didExecuteQuery(PhabricatorPolicyAwareQuery $query) {
     return;
   }
 
 
 /* -(  Rendering  )---------------------------------------------------------- */
 
 
   public function setRequest(AphrontRequest $request) {
     $this->request = $request;
     return $this;
   }
 
   public function getRequest() {
     return $this->request;
   }
 
   public function renderResults(
     array $objects,
     PhabricatorSavedQuery $query) {
 
     $phids = $this->getRequiredHandlePHIDsForResultList($objects, $query);
 
     if ($phids) {
       $handles = id(new PhabricatorHandleQuery())
         ->setViewer($this->requireViewer())
         ->witHPHIDs($phids)
         ->execute();
     } else {
       $handles = array();
     }
 
     return $this->renderResultList($objects, $query, $handles);
   }
 
   protected function getRequiredHandlePHIDsForResultList(
     array $objects,
     PhabricatorSavedQuery $query) {
     return array();
   }
 
   abstract protected function renderResultList(
     array $objects,
     PhabricatorSavedQuery $query,
     array $handles);
 
 
 /* -(  Application Search  )------------------------------------------------- */
 
 
   public function getSearchFieldsForConduit() {
     $standard_fields = $this->buildSearchFields();
 
     $fields = array();
     foreach ($standard_fields as $field_key => $field) {
       $conduit_key = $field->getConduitKey();
 
       if (isset($fields[$conduit_key])) {
         $other = $fields[$conduit_key];
         $other_key = $other->getKey();
 
         throw new Exception(
           pht(
             'SearchFields "%s" (of class "%s") and "%s" (of class "%s") both '.
             'define the same Conduit key ("%s"). Keys must be unique.',
             $field_key,
             get_class($field),
             $other_key,
             get_class($other),
             $conduit_key));
       }
 
       $fields[$conduit_key] = $field;
     }
 
     // These are handled separately for Conduit, so don't show them as
     // supported.
     unset($fields['order']);
     unset($fields['limit']);
 
     $viewer = $this->requireViewer();
     foreach ($fields as $key => $field) {
       $field->setViewer($viewer);
     }
 
     return $fields;
   }
 
   public function buildConduitResponse(
     ConduitAPIRequest $request,
     ConduitAPIMethod $method) {
     $viewer = $this->requireViewer();
 
     $query_key = $request->getValue('queryKey');
     if (!strlen($query_key)) {
       $saved_query = new PhabricatorSavedQuery();
     } else if ($this->isBuiltinQuery($query_key)) {
       $saved_query = $this->buildSavedQueryFromBuiltin($query_key);
     } else {
       $saved_query = id(new PhabricatorSavedQueryQuery())
         ->setViewer($viewer)
         ->withQueryKeys(array($query_key))
         ->executeOne();
       if (!$saved_query) {
         throw new Exception(
           pht(
             'Query key "%s" does not correspond to a valid query.',
             $query_key));
       }
     }
 
     $constraints = $request->getValue('constraints', array());
 
     $fields = $this->getSearchFieldsForConduit();
 
     foreach ($fields as $key => $field) {
       if (!$field->getConduitParameterType()) {
         unset($fields[$key]);
       }
     }
 
     $valid_constraints = array();
     foreach ($fields as $field) {
       foreach ($field->getValidConstraintKeys() as $key) {
         $valid_constraints[$key] = true;
       }
     }
 
     foreach ($constraints as $key => $constraint) {
       if (empty($valid_constraints[$key])) {
         throw new Exception(
           pht(
             'Constraint "%s" is not a valid constraint for this query.',
             $key));
       }
     }
 
     foreach ($fields as $field) {
       if (!$field->getValueExistsInConduitRequest($constraints)) {
         continue;
       }
 
       $value = $field->readValueFromConduitRequest(
         $constraints,
         $request->getIsStrictlyTyped());
       $saved_query->setParameter($field->getKey(), $value);
     }
 
     // NOTE: Currently, when running an ad-hoc query we never persist it into
     // a saved query. We might want to add an option to do this in the future
     // (for example, to enable a CLI-to-Web workflow where user can view more
     // details about results by following a link), but have no use cases for
     // it today. If we do identify a use case, we could save the query here.
 
     $query = $this->buildQueryFromSavedQuery($saved_query);
     $pager = $this->newPagerForSavedQuery($saved_query);
 
     $attachments = $this->getConduitSearchAttachments();
 
     // TODO: Validate this better.
     $attachment_specs = $request->getValue('attachments', array());
     $attachments = array_select_keys(
       $attachments,
       array_keys($attachment_specs));
 
     foreach ($attachments as $key => $attachment) {
       $attachment->setViewer($viewer);
     }
 
     foreach ($attachments as $key => $attachment) {
       $attachment->willLoadAttachmentData($query, $attachment_specs[$key]);
     }
 
     $this->setQueryOrderForConduit($query, $request);
     $this->setPagerLimitForConduit($pager, $request);
     $this->setPagerOffsetsForConduit($pager, $request);
 
     $objects = $this->executeQuery($query, $pager);
 
     $data = array();
     if ($objects) {
       $field_extensions = $this->getConduitFieldExtensions();
 
       $extension_data = array();
       foreach ($field_extensions as $key => $extension) {
         $extension_data[$key] = $extension->loadExtensionConduitData($objects);
       }
 
       $attachment_data = array();
       foreach ($attachments as $key => $attachment) {
         $attachment_data[$key] = $attachment->loadAttachmentData(
           $objects,
           $attachment_specs[$key]);
       }
 
       foreach ($objects as $object) {
         $field_map = $this->getObjectWireFieldsForConduit(
           $object,
           $field_extensions,
           $extension_data);
 
         $attachment_map = array();
         foreach ($attachments as $key => $attachment) {
           $attachment_map[$key] = $attachment->getAttachmentForObject(
             $object,
             $attachment_data[$key],
             $attachment_specs[$key]);
         }
 
         // If this is empty, we still want to emit a JSON object, not a
         // JSON list.
         if (!$attachment_map) {
           $attachment_map = (object)$attachment_map;
         }
 
         $id = (int)$object->getID();
         $phid = $object->getPHID();
 
         $data[] = array(
           'id' => $id,
           'type' => phid_get_type($phid),
           'phid' => $phid,
           'fields' => $field_map,
           'attachments' => $attachment_map,
         );
       }
     }
 
     return array(
       'data' => $data,
       'maps' => $method->getQueryMaps($query),
       'query' => array(
         // This may be `null` if we have not saved the query.
         'queryKey' => $saved_query->getQueryKey(),
       ),
       'cursor' => array(
         'limit' => $pager->getPageSize(),
         'after' => $pager->getNextPageID(),
         'before' => $pager->getPrevPageID(),
         'order' => $request->getValue('order'),
       ),
     );
   }
 
   public function getAllConduitFieldSpecifications() {
     $extensions = $this->getConduitFieldExtensions();
     $object = $this->newQuery()->newResultObject();
 
     $map = array();
     foreach ($extensions as $extension) {
       $specifications = $extension->getFieldSpecificationsForConduit($object);
       foreach ($specifications as $specification) {
         $key = $specification->getKey();
         if (isset($map[$key])) {
           throw new Exception(
             pht(
               'Two field specifications share the same key ("%s"). Each '.
               'specification must have a unique key.',
               $key));
         }
         $map[$key] = $specification;
       }
     }
 
     return $map;
   }
 
   private function getEngineExtensions() {
     $extensions = PhabricatorSearchEngineExtension::getAllEnabledExtensions();
 
     foreach ($extensions as $key => $extension) {
       $extension
         ->setViewer($this->requireViewer())
         ->setSearchEngine($this);
     }
 
     $object = $this->newResultObject();
     foreach ($extensions as $key => $extension) {
       if (!$extension->supportsObject($object)) {
         unset($extensions[$key]);
       }
     }
 
     return $extensions;
   }
 
 
   private function getConduitFieldExtensions() {
     $extensions = $this->getEngineExtensions();
     $object = $this->newResultObject();
 
     foreach ($extensions as $key => $extension) {
       if (!$extension->getFieldSpecificationsForConduit($object)) {
         unset($extensions[$key]);
       }
     }
 
     return $extensions;
   }
 
   private function setQueryOrderForConduit($query, ConduitAPIRequest $request) {
     $order = $request->getValue('order');
     if ($order === null) {
       return;
     }
 
     if (is_scalar($order)) {
       $query->setOrder($order);
     } else {
       $query->setOrderVector($order);
     }
   }
 
   private function setPagerLimitForConduit($pager, ConduitAPIRequest $request) {
     $limit = $request->getValue('limit');
 
     // If there's no limit specified and the query uses a weird huge page
     // size, just leave it at the default gigantic page size. Otherwise,
     // make sure it's between 1 and 100, inclusive.
 
     if ($limit === null) {
       if ($pager->getPageSize() >= 0xFFFF) {
         return;
       } else {
         $limit = 100;
       }
     }
 
     if ($limit > 100) {
       throw new Exception(
         pht(
           'Maximum page size for Conduit API method calls is 100, but '.
           'this call specified %s.',
           $limit));
     }
 
     if ($limit < 1) {
       throw new Exception(
         pht(
           'Minimum page size for API searches is 1, but this call '.
           'specified %s.',
           $limit));
     }
 
     $pager->setPageSize($limit);
   }
 
   private function setPagerOffsetsForConduit(
     $pager,
     ConduitAPIRequest $request) {
     $before_id = $request->getValue('before');
     if ($before_id !== null) {
       $pager->setBeforeID($before_id);
     }
 
     $after_id = $request->getValue('after');
     if ($after_id !== null) {
       $pager->setAfterID($after_id);
     }
   }
 
   protected function getObjectWireFieldsForConduit(
     $object,
     array $field_extensions,
     array $extension_data) {
 
     $fields = array();
     foreach ($field_extensions as $key => $extension) {
       $data = idx($extension_data, $key, array());
       $fields += $extension->getFieldValuesForConduit($object, $data);
     }
 
     return $fields;
   }
 
   public function getConduitSearchAttachments() {
     $extensions = $this->getEngineExtensions();
     $object = $this->newResultObject();
 
     $attachments = array();
     foreach ($extensions as $extension) {
       $extension_attachments = $extension->getSearchAttachments($object);
       foreach ($extension_attachments as $attachment) {
         $attachment_key = $attachment->getAttachmentKey();
         if (isset($attachments[$attachment_key])) {
           $other = $attachments[$attachment_key];
           throw new Exception(
             pht(
               'Two search engine attachments (of classes "%s" and "%s") '.
               'specify the same attachment key ("%s"); keys must be unique.',
               get_class($attachment),
               get_class($other),
               $attachment_key));
         }
         $attachments[$attachment_key] = $attachment;
       }
     }
 
     return $attachments;
   }
 
   final public function renderNewUserView() {
     $body = $this->getNewUserBody();
 
     if (!$body) {
       return null;
     }
 
     return $body;
   }
 
   protected function getNewUserHeader() {
     return null;
   }
 
   protected function getNewUserBody() {
     return null;
   }
 
   public function newUseResultsActions(PhabricatorSavedQuery $saved) {
     return array();
   }
 
 
 /* -(  Export  )------------------------------------------------------------- */
 
 
   public function canExport() {
     $fields = $this->newExportFields();
     return (bool)$fields;
   }
 
   final public function newExportFieldList() {
-    return $this->newExportFields();
+    $builtin_fields = array(
+      id(new PhabricatorIDExportField())
+        ->setKey('id')
+        ->setLabel(pht('ID')),
+      id(new PhabricatorPHIDExportField())
+        ->setKey('phid')
+        ->setLabel(pht('PHID')),
+    );
+
+    $fields = mpull($builtin_fields, null, 'getKey');
+
+    $export_fields = $this->newExportFields();
+    foreach ($export_fields as $export_field) {
+      $key = $export_field->getKey();
+
+      if (isset($fields[$key])) {
+        throw new Exception(
+          pht(
+            'Search engine ("%s") defines an export field with a key ("%s") '.
+            'that collides with another field. Each field must have a '.
+            'unique key.',
+            get_class($this),
+            $key));
+      }
+
+      $fields[$key] = $export_field;
+    }
+
+    return $fields;
+  }
+
+  final public function newExport(array $objects) {
+    $objects = array_values($objects);
+    $n = count($objects);
+
+    $maps = array();
+    foreach ($objects as $object) {
+      $maps[] = array(
+        'id' => $object->getID(),
+        'phid' => $object->getPHID(),
+      );
+    }
+
+    $export_data = $this->newExportData($objects);
+    $export_data = array_values($export_data);
+    if (count($export_data) !== count($objects)) {
+      throw new Exception(
+        pht(
+          'Search engine ("%s") exported the wrong number of objects, '.
+          'expected %s but got %s.',
+          get_class($this),
+          phutil_count($objects),
+          phutil_count($export_data)));
+    }
+
+    for ($ii = 0; $ii < $n; $ii++) {
+      $maps[$ii] += $export_data[$ii];
+    }
+
+    return $maps;
   }
 
   protected function newExportFields() {
     return array();
   }
 
+  protected function newExportData(array $objects) {
+    throw new PhutilMethodNotImplementedException();
+  }
+
 }