MAGETWO-86728: Ranged selects always miss the last range #12624

Author: Oleksii Korshenko

lib/internal/Magento/Framework/DB/Query/BatchRangeIterator.php

@@ -113,7 +113,7 @@ public function __construct(
     public function current()
     {
         if (null === $this->currentSelect) {
-            $this->isValid = ($this->currentOffset + $this->batchSize) <= $this->totalItemCount;
+            $this->isValid = $this->currentOffset < $this->totalItemCount;
             $this->currentSelect = $this->initSelectObject();
         }
         return $this->currentSelect;
@@ -144,7 +144,7 @@ public function next()
         if (null === $this->currentSelect) {
             $this->current();
         }
-        $this->isValid = ($this->batchSize + $this->currentOffset) <= $this->totalItemCount;
+        $this->isValid = $this->currentOffset < $this->totalItemCount;
         $select = $this->initSelectObject();
         if ($this->isValid) {
             $this->iteration++;

lib/internal/Magento/Framework/Test/Unit/DB/Query/BatchRangeIteratorTest.php

@@ -116,6 +116,6 @@ public function testIterations()
             $iterations++;
         }
 
-        $this->assertEquals(10, $iterations);
+        $this->assertEquals(11, $iterations);
     }
 }