Revert "Issue #2560897 by alexpott: Drupal\user\Plugin\views\argument\RolesRid is very broken"

This reverts commit f3040e71.

core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php

@@ -70,22 +70,11 @@ public function __construct(\PDO $connection, array $connection_options) {
     // Force PostgreSQL to use the UTF-8 character set by default.
     $this->connection->exec("SET NAMES 'UTF8'");
 
-    // Set PostgreSQL init_commands if not already defined.
-    $connection_options += array(
-      'init_commands' => array(),
-    );
-
-    $connection_options['init_commands'] += array(
-      // Set standard_conforming_strings to off so as to treat backslashes as
-      // escape characters, complying with historical PostgreSQL behavior. In
-      // PostgreSQL 9.1 and up this is on by default, however Drupal still
-      // assumes this to be off.
-      'standard_conforming_strings' => 'SET standard_conforming_strings = off',
-    );
-
     // Execute PostgreSQL init_commands.
+    if (isset($connection_options['init_commands'])) {
       $this->connection->exec(implode('; ', $connection_options['init_commands']));
     }
+  }
 
   /**
    * {@inheritdoc}

core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php

@@ -721,7 +721,7 @@ public function changeField($table, $field, $field_new, $spec, $new_keys = array
         // Convert to a bytea type by using the SQL replace() function to
         // convert any single backslashes in the field content to double
         // backslashes ('\' to '\\').
-        $this->connection->query('ALTER TABLE {' . $table . '} ALTER "' . $field . '" TYPE ' . $field_def . ' USING convert_to("' . $field . '", ' . "'UTF8')");
+        $this->connection->query('ALTER TABLE {' . $table . '} ALTER "' . $field . '" TYPE ' . $field_def . ' USING decode(replace("' . $field . '"' . ", '\\', '\\\\'), 'escape');");
       }
     }