How to join field value from custom table entity to product listing (field in custom table must filterable)

My scenario
each product related to one merchant (simplest)

product have attribute merchant_id (int). This attribute not describe product, only field link to merchant table. merchan_id field associated with Merchant model

I have table merchant contain fields : entity_id (int -> value in product), merchant_id (unique string)

After magento 2.3.2 core team have updated

https://github.com/magento/magento2/blob/2.3-develop/app/code/Magento/Catalog/Ui/DataProvider/Product/ProductCollection.php#L57

my field cannot filter anymore. So how is the correct way to add merchant_identifier field to product listing data ?

My Approach

1 Create field to catalog product listing

    
        
            
                text
                true
                asc
                text
                Merchant Identifier
                10
            
        
    

2 Preference catalog
etc/adminhtml/di.xml

3 Add my Provider extend Magento Provider

class ProductDataProvider extends MagentoCatalogUiDataProviderProductProductDataProvider

in construct add join only

public function __construct(
    //Dependencies
) {
    /*Join with merchant table.*/
    $this->collection->joinTable(
        ['merchant_tbl' => $this->collection->getTable('merchant')],
        "entity_id=merchant_id",
        ['merchant_identifier'=>'merchant_id'],
        null,
        'left'
    );
}

Here is how field show in catalog product listing

+-----------+------------+---------------------+
| entity_id | product_id | merchant_identifier |
+-----------+------------+---------------------+
|         1 |     123453 | merchant_ide123A_Af |
|         2 |     654657 | merchant_ide213A_Af |
|         3 |     345477 | merchant_ide312A_Af |
|         4 |     114673 | merchant_ide231A_Af |
+-----------+------------+---------------------+