nullValue fix

Author: alshabalin

src/Traits/TypeValueHelpersTrait.php

@@ -13,6 +13,8 @@
 use Ydb\StructMember;
 use Ydb\Type\PrimitiveTypeId;
 
+use Google\Protobuf\NullValue;
+
 use YandexCloud\Ydb\Types\IntType;
 use YandexCloud\Ydb\Types\BoolType;
 use YandexCloud\Ydb\Types\DateType;
@@ -212,7 +214,7 @@ protected function convertBulkRows($rows, $columns_types = [])
                 }
                 else
                 {
-                    $item[] = new Value(['null_flag_value' => null]);
+                    $item[] = new Value(['null_flag_value' => NullValue::NULL_VALUE]);
                 }
             }
             $data[] = new Value([

src/Types/AbstractType.php

@@ -5,6 +5,9 @@
 use Ydb\Type;
 use Ydb\Value;
 use Ydb\TypedValue;
+
+use Google\Protobuf\NullValue;
+
 use YandexCloud\Ydb\Contracts\TypeContract;
 use YandexCloud\Ydb\Traits\TypeValueHelpersTrait;
 
@@ -70,7 +73,7 @@ public function toYdbValue()
     {
         if ($this->value === null)
         {
-            return new Value(['null_flag_value' => true]);
+            return new Value(['null_flag_value' => NullValue::NULL_VALUE]);
         }
         return new Value([$this->getYdbKeyName() => $this->getYdbValue()]);
     }