Fix CI failures on MySQL/MariaDB

1. Handle uninitialized Column::$fixed property in BakeMigrationDiffCommand

   When TableSchema::getColumn() is called on cached/serialized schema
   objects, the Column::$fixed property may not be initialized, causing
   an Error. Added safeGetColumn() helper that catches this error and
   uses reflection to initialize uninitialized properties before retry.

2. Fix CURRENT_TIMESTAMP test assertion for MySQL/MariaDB

   Different versions of MySQL and MariaDB return CURRENT_TIMESTAMP
   in different formats (CURRENT_TIMESTAMP, current_timestamp(),
   CURRENT_TIMESTAMP()). Changed the test to use a regex that accepts
   all valid formats case-insensitively.

Fixes #1033

Author: dereuromark

src/Command/BakeMigrationDiffCommand.php

@@ -27,13 +27,17 @@
 use Cake\Database\Schema\ForeignKey;
 use Cake\Database\Schema\Index;
 use Cake\Database\Schema\TableSchema;
+use Cake\Database\Schema\TableSchemaInterface;
 use Cake\Database\Schema\UniqueKey;
 use Cake\Datasource\ConnectionManager;
 use Cake\Event\Event;
 use Cake\Event\EventManager;
+use Error;
 use Migrations\Migration\ManagerFactory;
 use Migrations\Util\TableFinder;
 use Migrations\Util\UtilTrait;
+use ReflectionException;
+use ReflectionProperty;
 
 /**
  * Task class for generating migration diff files.
@@ -274,8 +278,8 @@ protected function getColumns(): void
 
             // changes in columns meta-data
             foreach ($currentColumns as $columnName) {
-                $column = $currentSchema->getColumn($columnName);
-                $oldColumn = $this->dumpSchema[$table]->getColumn($columnName);
+                $column = $this->safeGetColumn($currentSchema, $columnName);
+                $oldColumn = $this->safeGetColumn($this->dumpSchema[$table], $columnName);
                 unset(
                     $column['collate'],
                     $column['fixed'],
@@ -621,6 +625,67 @@ public function template(): string
         return 'Migrations.config/diff';
     }
 
+    /**
+     * Safely get column information from a TableSchema.
+     *
+     * This method handles the case where Column::$fixed property may not be
+     * initialized (e.g., when loaded from a cached/serialized schema).
+     *
+     * @param \Cake\Database\Schema\TableSchemaInterface $schema The table schema
+     * @param string $columnName The column name
+     * @return array<string, mixed> Column data array
+     */
+    protected function safeGetColumn(TableSchemaInterface $schema, string $columnName): array
+    {
+        try {
+            return $schema->getColumn($columnName);
+        } catch (Error $e) {
+            // Handle uninitialized typed property errors (e.g., Column::$fixed)
+            // This can happen with cached/serialized schema objects
+            if (str_contains($e->getMessage(), 'must not be accessed before initialization')) {
+                // Initialize uninitialized properties using reflection and retry
+                $this->initializeColumnProperties($schema, $columnName);
+
+                return $schema->getColumn($columnName);
+            }
+            throw $e;
+        }
+    }
+
+    /**
+     * Initialize potentially uninitialized Column properties using reflection.
+     *
+     * @param \Cake\Database\Schema\TableSchemaInterface $schema The table schema
+     * @param string $columnName The column name
+     * @return void
+     */
+    protected function initializeColumnProperties(TableSchemaInterface $schema, string $columnName): void
+    {
+        // Access the internal columns array via reflection
+        $reflection = new ReflectionProperty($schema, '_columns');
+        $columns = $reflection->getValue($schema);
+
+        if (!isset($columns[$columnName]) || !($columns[$columnName] instanceof Column)) {
+            return;
+        }
+
+        $column = $columns[$columnName];
+
+        // List of nullable properties that might not be initialized
+        $nullableProperties = ['fixed', 'collate', 'unsigned', 'generated', 'srid', 'onUpdate'];
+
+        foreach ($nullableProperties as $propertyName) {
+            try {
+                $propReflection = new ReflectionProperty(Column::class, $propertyName);
+                if (!$propReflection->isInitialized($column)) {
+                    $propReflection->setValue($column, null);
+                }
+            } catch (Error | ReflectionException) {
+                // Property doesn't exist or can't be accessed, skip it
+            }
+        }
+    }
+
     /**
      * Gets the option parser instance and configures it.
      *

tests/TestCase/MigrationsTest.php

@@ -15,7 +15,6 @@
 
 use Cake\Core\Configure;
 use Cake\Core\Plugin;
-use Cake\Database\Driver\Mysql;
 use Cake\Database\Driver\Sqlserver;
 use Cake\Datasource\ConnectionManager;
 use Cake\TestSuite\TestCase;
@@ -218,14 +217,19 @@ public function testMigrateAndRollback()
         $expected = ['id', 'name', 'created', 'updated'];
         $this->assertEquals($expected, $columns);
         $createdColumn = $storesTable->getSchema()->getColumn('created');
-        $expected = 'CURRENT_TIMESTAMP';
         $driver = $this->Connection->getDriver();
-        if ($driver instanceof Mysql && $driver->isMariadb()) {
-            $expected = 'current_timestamp()';
-        } elseif ($driver instanceof Sqlserver) {
+        if ($driver instanceof Sqlserver) {
             $expected = 'getdate()';
+            $this->assertEquals($expected, $createdColumn['default']);
+        } else {
+            // MySQL and MariaDB may return CURRENT_TIMESTAMP in different formats
+            // depending on version: CURRENT_TIMESTAMP, current_timestamp(), CURRENT_TIMESTAMP()
+            $this->assertMatchesRegularExpression(
+                '/^current_timestamp(\(\))?$/i',
+                $createdColumn['default'],
+                'Default value should be CURRENT_TIMESTAMP in some form',
+            );
         }
-        $this->assertEquals($expected, $createdColumn['default']);
 
         // Rollback last
         $rollback = $this->migrations->rollback();