MAPG-199 fix issues found by PHPStan

src/Database/Query/Select.php

@@ -30,7 +30,7 @@ class Select
 
     private array $orders = [];
 
-    private array $limit;
+    private ?array $limit;
 
     public function __construct(IConnection $connection, ?string $table = null)
     {
@@ -144,7 +144,7 @@ class Select
         $this->limit = null;
     }
 
-    public function paginate(int $page, int $itemsPerPage)
+    public function paginate(int $page, int $itemsPerPage): Select
     {
         $this->limit($itemsPerPage, ($page - 1) * $itemsPerPage);
 
@@ -308,7 +308,7 @@ class Select
         return implode(' ', $joins);
     }
 
-    private function generateConditions(string $type): array
+    private function generateConditions(int $type): array
     {
         $conditions = '';
         $params = [];
@@ -376,9 +376,9 @@ class Select
         return [$conditionsString, $params];
     }
 
-    private function generateComplexConditionFragment(string $type, Closure $conditionCallback): array
+    private function generateComplexConditionFragment(int $type, Closure $conditionCallback): array
     {
-        $instance = new static($this->connection, $this->table);
+        $instance = new self($this->connection, $this->table);
         $instance->tableAliases = $this->tableAliases;
 
         $conditionCallback($instance);