pg_conversion
   The catalog pg_conversion describes
   encoding conversion functions.  See CREATE CONVERSION
   for more information.
  
Table 53.14. pg_conversion Columns
| Column Type Description | 
|---|
| 
        Row identifier | 
| 
        Conversion name (unique within a namespace) | 
| 
        The OID of the namespace that contains this conversion | 
| 
        Owner of the conversion | 
| 
        
       Source encoding ID ( | 
| 
        
       Destination encoding ID ( | 
| 
        Conversion function | 
| 
        True if this is the default conversion |