[DBAL-224] Add API to drop index and pk from tables instances

lib/Doctrine/DBAL/Schema/Table.php

@@ -159,6 +159,32 @@ class Table extends AbstractAsset
         return $this->_createIndex($columnNames, $indexName, false, false);
     }
 
+    /**
+     * Drop an index from this table.
+     *
+     * @param string $indexName
+     * @return void
+     */
+    public function dropPrimaryKey()
+    {
+        $this->dropIndex($this->_primaryKeyName);
+    }
+
+    /**
+     * Drop an index from this table.
+     *
+     * @param string $indexName
+     * @return void
+     */
+    public function dropIndex($indexName)
+    {
+        $indexName = strtolower($indexName);
+        if (!$this->hasIndex($indexName)) {
+            throw SchemaException::indexDoesNotExist($indexName, $this->_name);
+        }
+        unset($this->_indexes[$indexName]);
+    }
+
     /**
      *
      * @param array $columnNames

tests/Doctrine/Tests/DBAL/Schema/TableTest.php

@@ -497,4 +497,34 @@ class TableTest extends \Doctrine\Tests\DbalTestCase
         $this->assertEquals('test.test', $table->getFullQualifiedName("test"));
         $this->assertEquals('other.test', $table->getFullQualifiedName("other"));
     }
+
+    /**
+     * @group DBAL-224
+     */
+    public function testDropIndex()
+    {
+        $table = new Table("test");
+        $table->addColumn('id', 'integer');
+        $table->addIndex(array('id'), 'idx');
+
+        $this->assertTrue($table->hasIndex('idx'));
+
+        $table->dropIndex('idx');
+        $this->assertFalse($table->hasIndex('idx'));
+    }
+
+    /**
+     * @group DBAL-224
+     */
+    public function testDropPrimaryKey()
+    {
+        $table = new Table("test");
+        $table->addColumn('id', 'integer');
+        $table->setPrimaryKey(array('id'));
+
+        $this->assertTrue($table->hasPrimaryKey());
+
+        $table->dropPrimaryKey();
+        $this->assertFalse($table->hasPrimaryKey());
+    }
 }