Moved rowCount() from Statement to ResultStatement

UPGRADE.md

 # Upgrade to 3.0
 
+## BC BREAK `Statement::rowCount()` is moved.
+
+`Statement::rowCount()` has been moved to the `ResultStatement` interface where it belongs by definition.
+
 ## BC BREAK Transaction-related `Statement` methods return `void`.
 
 `Statement::beginTransaction()`, `::commit()` and `::rollBack()` no longer return a boolean value. They will throw a `DriverException` in case of failure.

lib/Doctrine/DBAL/Cache/ArrayStatement.php

@@ -57,6 +57,18 @@ class ArrayStatement implements IteratorAggregate, ResultStatement
         return $this->columnCount;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function rowCount() : int
+    {
+        if ($this->data === null) {
+            return 0;
+        }
+
+        return count($this->data);
+    }
+
     /**
      * {@inheritdoc}
      */

lib/Doctrine/DBAL/Cache/ResultCacheStatement.php

@@ -6,14 +6,12 @@ use ArrayIterator;
 use Doctrine\Common\Cache\Cache;
 use Doctrine\DBAL\DBALException;
 use Doctrine\DBAL\Driver\ResultStatement;
-use Doctrine\DBAL\Driver\Statement;
 use Doctrine\DBAL\FetchMode;
 use InvalidArgumentException;
 use IteratorAggregate;
 use function array_key_exists;
 use function array_merge;
 use function array_values;
-use function assert;
 use function count;
 use function reset;
 
@@ -214,8 +212,6 @@ class ResultCacheStatement implements IteratorAggregate, ResultStatement
      */
     public function rowCount() : int
     {
-        assert($this->statement instanceof Statement);
-
         return $this->statement->rowCount();
     }
 }

lib/Doctrine/DBAL/Driver/ResultStatement.php

@@ -25,6 +25,17 @@ interface ResultStatement extends Traversable
      */
     public function columnCount();
 
+    /**
+     * Returns the number of rows affected by the last DELETE, INSERT, or UPDATE statement
+     * executed by the corresponding object.
+     *
+     * If the last SQL statement executed by the associated Statement object was a SELECT statement,
+     * some databases may return the number of rows returned by that statement. However,
+     * this behaviour is not guaranteed for all databases and should not be
+     * relied on for portable applications.
+     */
+    public function rowCount() : int;
+
     /**
      * Sets the fetch mode to use while iterating this statement.
      *

lib/Doctrine/DBAL/Driver/Statement.php

@@ -88,17 +88,4 @@ interface Statement extends ResultStatement
      * @return bool TRUE on success or FALSE on failure.
      */
     public function execute($params = null);
-
-    /**
-     * Returns the number of rows affected by the last DELETE, INSERT, or UPDATE statement
-     * executed by the corresponding object.
-     *
-     * If the last SQL statement executed by the associated Statement object was a SELECT statement,
-     * some databases may return the number of rows returned by that statement. However,
-     * this behaviour is not guaranteed for all databases and should not be
-     * relied on for portable applications.
-     *
-     * @return int The number of rows.
-     */
-    public function rowCount() : int;
 }