fetchAll(PDO::FETCH_KEY_PAIR) has incorrect return type with an extra array (#307)

* Fix test expectations

* Update PdoStatementFetchDynamicReturnTypeExtension.php

Author: staabm

src/Extensions/PdoStatementFetchDynamicReturnTypeExtension.php

@@ -127,6 +127,9 @@ private function inferType(MethodReflection $methodReflection, MethodCall $metho
         }
 
         if ('fetchAll' === $methodReflection->getName()) {
+            if (QueryReflector::FETCH_TYPE_KEY_VALUE === $fetchType) {
+                return $rowType;
+            }
             return new ArrayType(new IntegerType(), $rowType);
         }
 

tests/default/data/pdo-stmt-fetch.php

@@ -39,7 +39,7 @@ public function fetchAll(PDO $pdo)
         assertType('array<int, int<0, 4294967295>>', $all);
 
         $all = $stmt->fetchAll(PDO::FETCH_KEY_PAIR);
-        assertType('array<int, array<string, int<0, 4294967295>>>', $all);
+        assertType('array<string, int<0, 4294967295>>', $all);
 
         $all = $stmt->fetchAll(PDO::FETCH_CLASS, MyRowClass::class);
         assertType('array<int, staabm\PHPStanDba\Tests\Fixture\MyRowClass>', $all);