The catalog pg_language registers languages in which you can write functions or stored procedures. See CREATE LANGUAGE and Chapter 39 for more information about language handlers.

Table 49-28. pg_language Columns

Name Type References Description
oid oid Row identifier (hidden attribute; must be explicitly selected)
lanname name Name of the language
lanowner oid pg_authid .oid Owner of the language
lanispl bool This is false for internal languages (such as SQL ) and true for user-defined languages. Currently, pg_dump still uses this to determine which languages need to be dumped, but this might be replaced by a different mechanism in the future.
lanpltrusted bool True if this is a trusted language, which means that it is believed not to grant access to anything outside the normal SQL execution environment. Only superusers can create functions in untrusted languages.
lanplcallfoid oid pg_proc .oid For noninternal languages this references the language handler, which is a special function that is responsible for executing all functions that are written in the particular language
laninline oid pg_proc .oid This references a function that is responsible for executing "inline" anonymous code blocks ( DO blocks). Zero if inline blocks are not supported.
lanvalidator oid pg_proc .oid This references a language validator function that is responsible for checking the syntax and validity of new functions when they are created. Zero if no validator is provided.
lanacl aclitem[] Access privileges; see GRANT and REVOKE for details