use identity sequence name for generating SQL to drop an autoincrement from a column

lib/Doctrine/DBAL/Platforms/OraclePlatform.php

@@ -533,14 +533,16 @@ END;';
     public function getDropAutoincrementSql($table)
     {
         $table = $this->normalizeIdentifier($table);
-        $quotedTableName = $table->getQuotedName($this);
-        $unquotedTableName = $table->getName();
         $autoincrementIdentifierName = $this->getAutoincrementIdentifierName($table);
+        $identitySequenceName = $this->getIdentitySequenceName(
+            $table->isQuoted() ? $table->getQuotedName($this) : $table->getName(),
+            ''
+        );
 
         return array(
             'DROP TRIGGER ' . $autoincrementIdentifierName,
-            $this->getDropSequenceSQL($unquotedTableName . '_SEQ'), // todo: needs to be fixed
-            $this->getDropConstraintSQL($autoincrementIdentifierName, $quotedTableName),
+            $this->getDropSequenceSQL($identitySequenceName),
+            $this->getDropConstraintSQL($autoincrementIdentifierName, $table->getQuotedName($this)),
         );
     }
 

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

@@ -506,4 +506,43 @@ class OraclePlatformTest extends AbstractPlatformTestCase
             'ALTER TABLE foo RENAME COLUMN bar TO baz',
         );
     }
+
+    /**
+     * @dataProvider getReturnsDropAutoincrementSQL
+     * @group DBAL-831
+     */
+    public function testReturnsDropAutoincrementSQL($table, $expectedSql)
+    {
+        $this->assertSame($expectedSql, $this->_platform->getDropAutoincrementSql($table));
+    }
+
+    public function getReturnsDropAutoincrementSQL()
+    {
+        return array(
+            array(
+                'myTable',
+                array(
+                    'DROP TRIGGER MYTABLE_AI_PK',
+                    'DROP SEQUENCE MYTABLE_SEQ',
+                    'ALTER TABLE MYTABLE DROP CONSTRAINT MYTABLE_AI_PK',
+                )
+            ),
+            array(
+                '"myTable"',
+                array(
+                    'DROP TRIGGER "myTable_AI_PK"',
+                    'DROP SEQUENCE "myTable_SEQ"',
+                    'ALTER TABLE "myTable" DROP CONSTRAINT "myTable_AI_PK"',
+                )
+            ),
+            array(
+                'table',
+                array(
+                    'DROP TRIGGER TABLE_AI_PK',
+                    'DROP SEQUENCE TABLE_SEQ',
+                    'ALTER TABLE "TABLE" DROP CONSTRAINT TABLE_AI_PK',
+                )
+            ),
+        );
+    }
 }