core/data-grid/data-grid.model.ts
        
Describes the settings of filter in a column.
                            Properties | 
                    
                            
  | 
                    
| externalFilterQuery | 
                                        externalFilterQuery:         
                                     | 
                                
                                            Type :         any
                                         | 
                                    
| Optional | 
| 
                                     Custom filtering form renderer can set any value here and it can be used to build a query to the server.  |