MAGETWO-68808: catalog_product_attribute is slow

Author: kandy

lib/internal/Magento/Framework/Indexer/BatchProvider.php

@@ -58,7 +58,7 @@ public function getBatchIds(
             $connection->quote($batch['to'])
         );
 
-        $ids = $connection->fetchCol($select->where($betweenCondition)->limit($batch['to'] - $batch['from'] + 1));
+        $ids = $connection->fetchCol($select->where($betweenCondition));
         return array_map('intval', $ids);
     }
 }

lib/internal/Magento/Framework/Indexer/Test/Unit/BatchProviderTest.php

@@ -64,8 +64,6 @@ public function testGetBatchIds()
         $adapterMock = $this->getMock(AdapterInterface::class);
 
         $selectMock->expects($this->once())->method('where')->with('(entity_id BETWEEN 10 AND 100)')->willReturnSelf();
-        $selectMock->expects($this->once())->method('limit')->with(91)->willReturnSelf();
-
         $adapterMock->expects($this->atLeastOnce())->method('quote')->willReturnArgument(0);
         $adapterMock->expects($this->once())->method('fetchCol')->with($selectMock, [])->willReturn([1, 2, 3]);
         $this->assertEquals(