Issue #2645164 by kekkis, quietone, heddn, Lars Toomre: Fix use of $sourceValues and $destinationValues local variables

core/modules/migrate/src/MigrateExecutable.php

@@ -66,13 +66,6 @@ class MigrateExecutable implements MigrateExecutableInterface {
    */
   protected $counts = array();
 
-  /**
-   * The object currently being constructed.
-   *
-   * @var \stdClass
-   */
-  protected $destinationValues;
-
   /**
    * The source.
    *
@@ -80,13 +73,6 @@ class MigrateExecutable implements MigrateExecutableInterface {
    */
   protected $source;
 
-  /**
-   * The current data row retrieved from the source.
-   *
-   * @var \stdClass
-   */
-  protected $sourceValues;
-
   /**
    * The event dispatcher.
    *
@@ -277,8 +263,6 @@ class MigrateExecutable implements MigrateExecutableInterface {
         }
       }
 
-      // Reset row properties.
-      unset($sourceValues, $destinationValues);
       $this->sourceRowStatus = MigrateIdMapInterface::STATUS_IMPORTED;
 
       // Check for memory exhaustion.