pg_available_extension_versions
   The pg_available_extension_versions view lists the
   specific extension versions that are available for installation.
   See also the pg_extension
   catalog, which shows the extensions currently installed.
  
Table 51.68. pg_available_extension_versions Columns
| Name | Type | Description | 
|---|---|---|
| name | name | Extension name | 
| version | text | Version name | 
| installed | bool | True if this version of this extension is currently installed | 
| superuser | bool | True if only superusers are allowed to install this extension | 
| relocatable | bool | True if extension can be relocated to another schema | 
| schema | name | Name of the schema that the extension must be installed into,
       or NULLif partially or fully relocatable | 
| requires | name[] | Names of prerequisite extensions,
       or NULLif none | 
| comment | text | Comment string from the extension's control file | 
   The pg_available_extension_versions view is read
   only.