Use Connection::$columnFactory property

Author: Tigrov

src/Connection.php

@@ -67,7 +67,7 @@ public function createTransaction(): TransactionInterface
 
     public function getColumnFactory(): ColumnFactoryInterface
     {
-        return new ColumnFactory();
+        return $this->columnFactory ??= new ColumnFactory();
     }
 
     public function getQueryBuilder(): QueryBuilderInterface

tests/ConnectionTest.php

@@ -12,8 +12,10 @@
 use Yiisoft\Db\Exception\InvalidConfigException;
 use Yiisoft\Db\Exception\NotSupportedException;
 use Yiisoft\Db\Mysql\Column\ColumnFactory;
+use Yiisoft\Db\Mysql\Connection;
 use Yiisoft\Db\Mysql\Tests\Support\TestTrait;
 use Yiisoft\Db\Tests\Common\CommonConnectionTest;
+use Yiisoft\Db\Tests\Support\DbHelper;
 use Yiisoft\Db\Transaction\TransactionInterface;
 
 /**
@@ -168,4 +170,15 @@ public function testGetColumnFactory(): void
 
         $db->close();
     }
+
+    public function testUserDefinedColumnFactory(): void
+    {
+        $columnFactory = new ColumnFactory();
+
+        $db = new Connection($this->getDriver(), DbHelper::getSchemaCache(), $columnFactory);
+
+        $this->assertSame($columnFactory, $db->getColumnFactory());
+
+        $db->close();
+    }
 }