add penalty for single words that look like stop words

[nominatim.git] / lib-php / DB.php

diff --git a/lib-php/DB.php b/lib-php/DB.php
index 03ee6f1b8b6c6fc056b3e1a94604578b0f6fc2ed..553d9452e2f524b75d2f12631a18140c34460407 100644 (file)
--- a/lib-php/DB.php
+++ b/lib-php/DB.php
@@ -1,4 +1,12 @@
 <?php
+/**
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * This file is part of Nominatim. (https://nominatim.org)
+ *
+ * Copyright (C) 2022 by the Nominatim developer community.
+ * For a full list of authors see the git log.
+ */
 
 namespace Nominatim;
 
@@ -30,20 +38,25 @@ class DB
 
         // https://secure.php.net/manual/en/ref.pdo-pgsql.connection.php
         try {
-            $conn = new \PDO($this->sDSN, null, null, $aConnOptions);
+            $this->connection = new \PDO($this->sDSN, null, null, $aConnOptions);
         } catch (\PDOException $e) {
             $sMsg = 'Failed to establish database connection:' . $e->getMessage();
             throw new \Nominatim\DatabaseError($sMsg, 500, null, $e->getMessage());
         }
 
-        $conn->exec("SET DateStyle TO 'sql,european'");
-        $conn->exec("SET client_encoding TO 'utf-8'");
+        $this->connection->exec("SET DateStyle TO 'sql,european'");
+        $this->connection->exec("SET client_encoding TO 'utf-8'");
+        // Disable JIT and parallel workers. They interfere badly with search SQL.
+        $this->connection->exec('SET max_parallel_workers_per_gather TO 0');
+        if ($this->getPostgresVersion() >= 11) {
+            $this->connection->exec('SET jit_above_cost TO -1');
+        }
+        
         $iMaxExecution = ini_get('max_execution_time');
         if ($iMaxExecution > 0) {
-            $conn->setAttribute(\PDO::ATTR_TIMEOUT, $iMaxExecution); // seconds
+            $this->connection->setAttribute(\PDO::ATTR_TIMEOUT, $iMaxExecution); // seconds
         }
 
-        $this->connection = $conn;
         return true;
     }