diff --git a/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php b/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php
index 37ad89b..2d994fc 100644
--- a/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php
+++ b/core/lib/Drupal/Core/Database/Driver/sqlite/Connection.php
@@ -115,6 +115,7 @@ public static function open(array &$connection_options = array()) {
     $pdo->sqliteCreateFunction('if', array(__CLASS__, 'sqlFunctionIf'));
     $pdo->sqliteCreateFunction('greatest', array(__CLASS__, 'sqlFunctionGreatest'));
     $pdo->sqliteCreateFunction('pow', 'pow', 2);
+    $pdo->sqliteCreateFunction('exp', 'exp', 1);
     $pdo->sqliteCreateFunction('length', 'strlen', 1);
     $pdo->sqliteCreateFunction('md5', 'md5', 1);
     $pdo->sqliteCreateFunction('concat', array(__CLASS__, 'sqlFunctionConcat'));
diff --git a/core/modules/comment/src/CommentStatistics.php b/core/modules/comment/src/CommentStatistics.php
index f77a2c1..588c831 100644
--- a/core/modules/comment/src/CommentStatistics.php
+++ b/core/modules/comment/src/CommentStatistics.php
@@ -165,11 +165,13 @@ public function getRankingInfo() {
           // nodes.
           'on' => "ces.entity_id = i.sid AND ces.entity_type = 'node' AND ces.field_name = 'comment'",
         ),
-        // Inverse law that maps the highest reply count on the site to 1 and 0
-        // to 0. Note that the CAST here is necessary for PostgreSQL, because the
-        // PostgreSQL PDO driver sometimes puts values in as strings instead of
-        // numbers in complex expressions like this.
-        'score' => '2.0 - 2.0 / (1.0 + ces.comment_count * (CAST (:comment_scale AS DECIMAL(10, 4))))',
+        // Inverse law that maps the highest view count on the site to 1 and 0
+        // to 0. Note that the ROUND here is necessary for PostgreSQL and SQLite
+        // in order to ensure that the :comment_scale argument is treated as
+        // a numeric type, because the PostgreSQL PDO driver sometimes puts
+        // values in as strings instead of numbers in complex expressions like
+        // this.
+        'score' => '2.0 - 2.0 / (1.0 + ces.comment_count * (ROUND(:comment_scale, 4)))',
         'arguments' => array(':comment_scale' => \Drupal::state()->get('comment.node_comment_statistics_scale') ?: 0),
       ),
     );
diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index d0a7bcf..59a2596 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -665,14 +665,8 @@ function node_ranking() {
   if ($node_min_max = \Drupal::state()->get('node.min_max_update_time')) {
     $ranking['recent'] = array(
       'title' => t('Recently created'),
-      'join' => array(
-        'type' => 'LEFT',
-        'table' => 'node_field_data',
-        'alias' => 'nfd',
-        'on' => 'nfd.nid = sid',
-      ),
       // Exponential decay with half life of 14% of the age range of nodes.
-      'score' => 'EXP(-5 * (1 - (nfd.created - :node_oldest) / :node_range))',
+      'score' => 'EXP(-5 * (1 - (n.created - :node_oldest) / :node_range))',
       'arguments' => array(
         ':node_oldest' => $node_min_max['min_created'],
         ':node_range' => max($node_min_max['max_created'] - $node_min_max['min_created'], 1),
diff --git a/core/modules/search/src/SearchQuery.php b/core/modules/search/src/SearchQuery.php
index 4bd0a35..c1ecb48 100644
--- a/core/modules/search/src/SearchQuery.php
+++ b/core/modules/search/src/SearchQuery.php
@@ -508,8 +508,12 @@ public function addScore($score, $arguments = array(), $multiply = FALSE) {
     if ($multiply) {
       $i = count($this->multiply);
       // Modify the score expression so it is multiplied by the multiplier,
-      // with a divisor to renormalize.
-      $score = "(CAST (:multiply_$i AS DECIMAL(10,4))) * COALESCE(($score), 0) / (CAST (:total_$i AS DECIMAL(10,4)))";
+      // with a divisor to renormalize. Note that the ROUND here is necessary
+      // for PostgreSQL and SQLite in order to ensure that the :multiply_* and
+      // :total_* arguments are treated as a numeric type, because the
+      // PostgreSQL PDO driver sometimes puts values in as strings instead of
+      // numbers in complex expressions like this.
+      $score = "(ROUND(:multiply_$i, 4)) * COALESCE(($score), 0) / (ROUND(:total_$i, 4))";
       // Add an argument for the multiplier. The :total_$i argument is taken
       // care of in the execute() method, which is when the total divisor is
       // calculated.
@@ -524,7 +528,7 @@ public function addScore($score, $arguments = array(), $multiply = FALSE) {
     // in the execute() method we can add arguments.
     while (($pos = strpos($score, 'i.relevance')) !== FALSE) {
       $pieces = explode('i.relevance', $score, 2);
-      $score = implode('((CAST (:normalization_' . $this->relevance_count . ' AS DECIMAL(10,4))) * i.score * t.count)', $pieces);
+      $score = implode('((ROUND(:normalization_' . $this->relevance_count . ', 4)) * i.score * t.count)', $pieces);
       $this->relevance_count++;
     }
 
diff --git a/core/modules/statistics/statistics.module b/core/modules/statistics/statistics.module
index 5d84cb9..57e8ffc 100644
--- a/core/modules/statistics/statistics.module
+++ b/core/modules/statistics/statistics.module
@@ -169,10 +169,12 @@ function statistics_ranking() {
           'on' => 'node_counter.nid = i.sid',
         ),
         // Inverse law that maps the highest view count on the site to 1 and 0
-        // to 0. Note that the CAST here is necessary for PostgreSQL, because
-        // the PostgreSQL PDO driver sometimes puts values in as strings
-        // instead of numbers in complex expressions like this.
-        'score' => '2.0 - 2.0 / (1.0 + node_counter.totalcount * (CAST (:statistics_scale AS DECIMAL(10,4))))',
+        // to 0. Note that the ROUND here is necessary for PostgreSQL and SQLite
+        // in order to ensure that the :statistics_scale argument is treated as
+        // a numeric type, because the PostgreSQL PDO driver sometimes puts
+        // values in as strings instead of numbers in complex expressions like
+        // this.
+        'score' => '2.0 - 2.0 / (1.0 + node_counter.totalcount * (ROUND(:statistics_scale, 4)))',
         'arguments' => array(':statistics_scale' => \Drupal::state()->get('statistics.node_counter_scale') ?: 0),
       ),
     );