Provide ApplicationSearch hooks in Maniphest

Summary: Ref T418. Adds hooks to support customized ApplicationSearch (you can't currently add indexable fields without writing custom code).

Test Plan: Wrote custom code to add an indexable field.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T418

Differential Revision: https://secure.phabricator.com/D7002

src/applications/maniphest/query/ManiphestTaskQuery.php

@@ -718,22 +718,25 @@ final class ManiphestTaskQuery
         break;
     }
 
+    $joins[] = $this->buildApplicationSearchJoinClause($conn_r);
+
     return implode(' ', $joins);
   }
 
   private function buildGroupClause(AphrontDatabaseConnection $conn_r) {
-    $joined_multiple_project_rows = (count($this->projectPHIDs) > 1) ||
-                                    (count($this->anyProjectPHIDs) > 1);
+    $joined_multiple_rows = (count($this->projectPHIDs) > 1) ||
+                            (count($this->anyProjectPHIDs) > 1) ||
+                            ($this->getApplicationSearchMayJoinMultipleRows());
 
     $joined_project_name = ($this->groupBy == self::GROUP_PROJECT);
 
     // If we're joining multiple rows, we need to group the results by the
     // task IDs.
-    if ($joined_multiple_project_rows) {
+    if ($joined_multiple_rows) {
       if ($joined_project_name) {
-        return 'GROUP BY task.id, projectGroup.projectPHID';
+        return 'GROUP BY task.phid, projectGroup.projectPHID';
       } else {
-        return 'GROUP BY task.id';
+        return 'GROUP BY task.phid';
       }
     } else {
       return '';
@@ -950,4 +953,8 @@ final class ManiphestTaskQuery
       ));
   }
 
+  protected function getApplicationSearchObjectPHIDColumn() {
+    return 'task.phid';
+  }
+
 }

src/applications/maniphest/query/ManiphestTaskSearchEngine.php

@@ -3,6 +3,10 @@
 final class ManiphestTaskSearchEngine
   extends PhabricatorApplicationSearchEngine {
 
+  public function getCustomFieldObject() {
+    return new ManiphestTask();
+  }
+
   public function buildSavedQueryFromRequest(AphrontRequest $request) {
     $saved = new PhabricatorSavedQuery();
 
@@ -62,6 +66,8 @@ final class ManiphestTaskSearchEngine
       $saved->setParameter('limit', $limit);
     }
 
+    $this->readCustomFieldsFromRequest($request, $saved);
+
     return $saved;
   }
 
@@ -155,6 +161,8 @@ final class ManiphestTaskSearchEngine
       $query->withDateCreatedBefore($end);
     }
 
+    $this->applyCustomFieldsToQuery($query, $saved);
+
     return $query;
   }
 
@@ -308,6 +316,8 @@ final class ManiphestTaskSearchEngine
           ->setLabel(pht('Task IDs'))
           ->setValue(implode(', ', $ids)));
 
+    $this->appendCustomFieldsToForm($form, $saved);
+
     $this->buildDateRange(
       $form,
       $saved,

src/applications/people/query/PhabricatorPeopleQuery.php

@@ -266,6 +266,8 @@ final class PhabricatorPeopleQuery
         $this->nameLike);
     }
 
+    $where[] = $this->buildPagingClause($conn_r);
+
     return $this->formatWhereClause($where);
   }