PG_LANGUAGE

PG_LANGUAGE records programming languages. You can use them and interfaces to write functions or stored procedures.

**Table 1** PG_LANGUAGE columns
Name	Type	Reference	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	boolean	-	The value is false for internal languages (such as SQL) and true for user-defined languages. Currently, gs_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	boolean	-	Its value is 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 the initial user can create functions in untrusted languages.
lanplcallfoid	oid	PG_PROC.oid	For external 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). The value is 0 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. The value is 0 if no validator is provided.
lanacl	aclitem[]	-	Access permissions