Be less restrictive in DiscriminatorColumnMapping phpdoc

src/Mapping/ClassMetadata.php

@@ -2108,13 +2108,12 @@ public function addEntityListener(string $eventName, string $class, string $meth
      * @param DiscriminatorColumnMapping|mixed[]|null $columnDef
      * @psalm-param DiscriminatorColumnMapping|array{
      *     name: string|null,
-     *     fieldName?: string,
-     *     type?: string,
-     *     length?: int,
+     *     fieldName?: string|null,
+     *     type?: string|null,
+     *     length?: int|null,
      *     columnDefinition?: string|null,
      *     enumType?: class-string<BackedEnum>|null,
-     *     options?:array<string,
-     *     mixed>|null
+     *     options?:array<string, mixed>|null
      * }|null $columnDef
      *
      * @throws MappingException
@@ -2148,6 +2147,10 @@ public function setDiscriminatorColumn(DiscriminatorColumnMapping|array|null $co
                 throw MappingException::invalidDiscriminatorColumnType($this->name, $columnDef['type']);
             }
 
+            if (! isset($columnDef['options'])) {
+                $columnDef['options'] = [];
+            }
+
             $this->discriminatorColumn = DiscriminatorColumnMapping::fromMappingArray($columnDef);
         }
     }

src/Mapping/DiscriminatorColumnMapping.php

@@ -39,9 +39,9 @@ public function __construct(
      *     type: string,
      *     fieldName: string,
      *     name: string,
-     *     length?: int,
-     *     columnDefinition?: string,
-     *     enumType?: class-string<BackedEnum>,
+     *     length?: int|null,
+     *     columnDefinition?: string|null,
+     *     enumType?: class-string<BackedEnum>|null,
      *     options?: array<string, mixed>,
      * } $mappingArray
      */