GetList action of the SourceItemRepository builds wrong MySQL query when filterGroup is used by searchCriteria and request is sent from Magento Swagger UI

[TomashKhamlai]

Preconditions

1. Magento with MSI
2. One product is created and assigned to 2 or more sources.

Steps to reproduce

1. Navigate to `/swagger/
2. Apply the API Token inside the Swagger UI
3. Find inventoryApiSourceItemRepositoryV1
4. Set source_code as Field
5. Set default as Value
6. Set 10 as Page size
7. Set 1 as Current page
8. Click 'Try it out!' button

Expected result

1. Filtered searchResult

{                                                                                                                                                                                      
   "total_count" : 1,                                                                                                                                                                                                                        
   "search_criteria" : {                                                                                                                                                                                                                     
      "page_size" : 10,
      "filter_groups" : [
         {
            "filters" : [
               {
                  "value" : "default",
                  "field" : "source_code",
                  "condition_type" : "eq"
               }
            ]
         }
      ],
      "current_page" : 1
   },
   "items" : [
      {
         "sku" : "Simple Product 1",
         "quantity" : 1000,
         "status" : 1,
         "source_code" : "default"
      }
   ]
}

Actual result

1. Error in reports

{
  "message": "Internal Error. Details are available in Magento log file. Report ID: webapi-5ae1ce7dcb480"
}

Log file:

[2018-04-26 13:05:01] main.CRITICAL: Report ID: webapi-5ae1ce7dcb480; Message: SQLSTATE[42S22]: Column not found: 1054 Unknown column '' in 'where clause', query was: SELECT `main_table`.* FROM `inventory_source_item` AS `main_table` WHERE ((`source_code` = '')) AND ((`` = 'default')) {"exception":"[object] (Exception(code: 42): Report ID: webapi-5ae1ce7dcb480; Message: SQLSTATE[42S22]: Column not found: 1054 Unknown column '' in 'where clause', query was: SELECT `main_table`.* FROM `inventory_source_item` AS `main_table` WHERE ((`source_code` = '')) AND ((`` = 'default')) at /var/www/html/msi/lib/internal/Magento/Framework/Webapi/ErrorProcessor.php:205, Zend_Db_Statement_Exception(code: 42): SQLSTATE[42S22]: Column not found: 1054 Unknown column '' in 'where clause', query was: SELECT `main_table`.* FROM `inventory_source_item` AS `main_table` WHERE ((`source_code` = '')) AND ((`` = 'default')) at /var/www/html/msi/vendor/magento/zendframework1/library/Zend/Db/Statement/Pdo.php:235, PDOException(code: 42S22): SQLSTATE[42S22]: Column not found: 1054 Unknown column '' in 'where clause' at /var/www/html/msi/vendor/magento/zendframework1/library/Zend/Db/Statement/Pdo.php:228)"} []

caused by this query

SELECT `main_table`.* FROM `inventory_source_item` AS `main_table` WHERE ((`source_code` = '')) AND ((`` = 'default'))

[p-bystritsky]

It's Magento Core known bug magento/magento2#11477