Merge branch 'MAGETWO-63634' of github.com:magento-troll/magento2ce into MAGETWO-58456

Author: slopukhov

lib/internal/Magento/Framework/DB/FieldDataConverter.php

@@ -9,6 +9,7 @@
 use Magento\Framework\DB\Query\Generator;
 use Magento\Framework\DB\DataConverter\DataConverterInterface;
 use Magento\Framework\DB\Select\QueryModifierInterface;
+use Magento\Framework\DB\Select;
 
 /**
  * Convert field data from one representation to another
@@ -40,16 +41,17 @@ public function __construct(
     }
 
     /**
-     * Convert field data from one representation to another
+     * Get converter select
      *
      * @param AdapterInterface $connection
      * @param string $table
      * @param string $identifier
      * @param string $field
      * @param QueryModifierInterface|null $queryModifier
-     * @return void
+     *
+     * @return Select
      */
-    public function convert(
+    public function getSelect(
         AdapterInterface $connection,
         $table,
         $identifier,
@@ -62,6 +64,28 @@ public function convert(
         if ($queryModifier) {
             $queryModifier->modify($select);
         }
+
+        return $select;
+    }
+
+    /**
+     * Convert table field data from one representation to another uses DataConverterInterface
+     *
+     * @param AdapterInterface $connection
+     * @param string $table
+     * @param string $identifier
+     * @param string $field
+     * @param QueryModifierInterface|null $queryModifier
+     * @return void
+     */
+    public function convert(
+        AdapterInterface $connection,
+        $table,
+        $identifier,
+        $field,
+        QueryModifierInterface $queryModifier = null
+    ) {
+        $select = $this->getSelect($connection, $table, $identifier, $field, $queryModifier);
         $iterator = $this->queryGenerator->generate($identifier, $select);
         foreach ($iterator as $selectByRange) {
             $rows = $connection->fetchAll($selectByRange);