Issue #2545480 by gryp, morgantocker, Crell, kevinquillen: Don't use the ANSI...

Issue #2545480 by gryp, morgantocker, Crell, kevinquillen: Don't use the ANSI SQL mode since it has different meanings for different MySQL versions (and breaks MySQL 5.7 support in Drupal 7)

CHANGELOG.txt

 
 Drupal 7.42, xxxx-xx-xx (development version)
 -----------------------
+- Improved MySQL 5.7 support by changing the MySQL database driver to stop
+  using the ANSI SQL mode alias, which has different meanings for different
+  MySQL versions.
 - Fixed a regression introduced in Drupal 7.39 which prevented autocomplete
   functionality from working on servers that are not configured to
   automatically recognize index.php.

includes/database/mysql/database.inc

@@ -81,7 +81,7 @@ public function __construct(array $connection_options = array()) {
       'init_commands' => array(),
     );
     $connection_options['init_commands'] += array(
-      'sql_mode' => "SET sql_mode = 'ANSI,STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER'",
+      'sql_mode' => "SET sql_mode = 'REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER'",
     );
     // Execute initial commands.
     foreach ($connection_options['init_commands'] as $sql) {