pg_conversion
The catalog pg_conversion describes encoding conversion functions.
Table 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  |