53.2. pg_available_extensions
 The pg_available_extensions view lists the extensions that are available for installation. See also the pg_extension catalog, which shows the extensions currently installed. 
Table 53.2. pg_available_extensions Columns
| Column Type Description | 
|---|
| 
 Extension name | 
| 
  Name of default version, or  | 
| 
  Currently installed version of the extension, or  | 
| 
 Comment string from the extension's control file | 
 The pg_available_extensions view is read-only.