43.20. `pg_language`

The catalog pg_language registers languages in which you can write functions or stored procedures. See CREATE LANGUAGE and Chapter 36 for more information about language handlers.

Table 43-20. pg_language Columns

Name	Type	References	Description
`lanname`	`name`		Name 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 may 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 may 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
`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