add SMALLSERIAL type support on PostgreSQL 9.2 platform

lib/Doctrine/DBAL/Platforms/PostgreSQL92Platform.php

@@ -36,6 +36,18 @@ class PostgreSQL92Platform extends PostgreSqlPlatform
         return 'JSON';
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getSmallIntTypeDeclarationSQL(array $field)
+    {
+        if ( ! empty($field['autoincrement'])) {
+            return 'SMALLSERIAL';
+        }
+
+        return parent::getSmallIntTypeDeclarationSQL($field);
+    }
+
     /**
      * {@inheritdoc}
      */

tests/Doctrine/Tests/DBAL/Platforms/PostgreSQL92PlatformTest.php

@@ -30,6 +30,24 @@ class PostgreSQL92PlatformTest extends AbstractPostgreSqlPlatformTestCase
         $this->assertSame('JSON', $this->_platform->getJsonTypeDeclarationSQL(array()));
     }
 
+    public function testReturnsSmallIntTypeDeclarationSQL()
+    {
+        $this->assertSame(
+            'SMALLSERIAL',
+            $this->_platform->getSmallIntTypeDeclarationSQL(array('autoincrement' => true))
+        );
+
+        $this->assertSame(
+            'SMALLINT',
+            $this->_platform->getSmallIntTypeDeclarationSQL(array('autoincrement' => false))
+        );
+
+        $this->assertSame(
+            'SMALLINT',
+            $this->_platform->getSmallIntTypeDeclarationSQL(array())
+        );
+    }
+
     /**
      * @group DBAL-553
      */