Expression: Handle null $subTree

Author: homersimpsons

composer.json

@@ -13,7 +13,7 @@
         }
     ],
     "require": {
-    	"php": ">=7.4.0 || ^8.0",
+    	"php": "^7.4 || ^8.0",
     	"mouf/utils.common.conditioninterface": "~2.0",
     	"mouf/utils.value.value-interface": "~1.0",
     	"mouf/utils.common.paginable-interface": "~1.0",

phpstan-baseline.neon

@@ -95,11 +95,6 @@ parameters:
 			count: 1
 			path: src/SQLParser/Node/NodeFactory.php
 
-		-
-			message: "#^Parameter \\#1 \\$var of function count expects array\\|Countable, array\\<SQLParser\\\\Node\\\\NodeInterface\\>\\|SQLParser\\\\Node\\\\NodeInterface given\\.$#"
-			count: 1
-			path: src/SQLParser/Node/NodeFactory.php
-
 		-
 			message: "#^Parameter \\#2 \\.\\.\\.\\$args of function array_merge expects array, array\\<SQLParser\\\\Node\\\\NodeInterface\\>\\|SQLParser\\\\Node\\\\NodeInterface given\\.$#"
 			count: 1

src/SQLParser/Node/Expression.php

@@ -69,11 +69,11 @@ public function setBaseExpression($baseExpression): void
         $this->baseExpression = $baseExpression;
     }
 
-    /** @var NodeInterface[]|NodeInterface */
+    /** @var NodeInterface[]|NodeInterface|null */
     private $subTree;
 
     /**
-     * @return NodeInterface|NodeInterface[]
+     * @return NodeInterface|NodeInterface[]|null
      */
     public function getSubTree()
     {
@@ -263,7 +263,7 @@ public function walk(VisitorInterface $visitor)
                         $this->subTree[$key] = $result2;
                     }
                 }
-            } else {
+            } elseif ($this->subTree instanceof NodeInterface) {
                 $result2 = $this->subTree->walk($visitor);
                 if ($result2 === NodeTraverser::REMOVE_NODE) {
                     $this->subTree = [];

src/SQLParser/Node/NodeFactory.php

@@ -652,7 +652,7 @@ public static function simplify($nodes)
                 if ($operand instanceof Expression) {
                     if (empty($operand->getBaseExpression())) {
                         $subTree = $operand->getSubTree();
-                        if (count($subTree) === 1) {
+                        if (is_array($subTree) && count($subTree) === 1) {
                             $newNodes = array_merge($newNodes, self::simplify($subTree));
                         } else {
                             $newNodes[] = $operand;

tests/Mouf/Database/MagicQueryTest.php

@@ -208,6 +208,9 @@ public function testStandardSelect()
 
         $sql = 'SELECT COUNT(*) AS cnt FROM (SELECT id FROM country) subquery';
         $this->assertEquals($sql, self::simplifySql($magicQuery->build($sql)));
+
+        $sql = "SELECT YEAR(register_date) AS year FROM users GROUP BY year";
+        $this->assertEquals("SELECT YEAR(register_date) AS year FROM users GROUP BY year", self::simplifySql($magicQuery->build($sql)));
     }
 
     public function testInNullException() {