Fix Ponder Answer query joins, builtins

Summary: Fixes T9234. The joins method was still the old method and the builtin was calling the wrong key.

Test Plan: Test authored builtin, custom search

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9234

Differential Revision: https://secure.phabricator.com/D13953

src/applications/ponder/query/PonderQuestionQuery.php

@@ -129,7 +129,7 @@ final class PonderQuestionQuery
     return $questions;
   }
 
-  private function buildJoinsClause(AphrontDatabaseConnection $conn_r) {
+  protected function buildJoinClauseParts(AphrontDatabaseConnection $conn_r) {
     $joins = array();
 
     if ($this->answererPHIDs) {
@@ -141,7 +141,7 @@ final class PonderQuestionQuery
         $this->answererPHIDs);
     }
 
-    return implode(' ', $joins);
+    return $joins;
   }
 
   protected function getPrimaryTableAlias() {

src/applications/ponder/query/PonderQuestionSearchEngine.php

@@ -96,7 +96,7 @@ final class PonderQuestionSearchEngine
           array($this->requireViewer()->getPHID()));
       case 'answered':
         return $query->setParameter(
-          'answererPHIDs',
+          'answerers',
           array($this->requireViewer()->getPHID()));
     }