50.36. pg_pltemplate

The catalog pg_pltemplate stores "template" information for procedural languages. A template for a language allows the language to be created in a particular database by a simple CREATE LANGUAGE command, with no need to specify implementation details.

Unlike most system catalogs, pg_pltemplate is shared across all databases of a cluster: there is only one copy of pg_pltemplate per cluster, not one per database. This allows the information to be accessible in each database as it is needed.

Table 50-36. pg_pltemplate Columns

Name	Type	Description
`tmplname`	`name`	Name of the language this template is for
`tmpltrusted`	`boolean`	True if language is considered trusted
`tmpldbacreate`	`boolean`	True if language may be created by a database owner
`tmplhandler`	`text`	Name of call handler function
`tmplinline`	`text`	Name of anonymous-block handler function, or null if none
`tmplvalidator`	`text`	Name of validator function, or null if none
`tmpllibrary`	`text`	Path of shared library that implements language
`tmplacl`	`aclitem[]`	Access privileges for template (not actually used)

There are not currently any commands that manipulate procedural language templates; to change the built-in information, a superuser must modify the table using ordinary INSERT, DELETE, or UPDATE commands.

Note: It is likely that pg_pltemplate will be removed in some future release of PostgreSQL, in favor of keeping this knowledge about procedural languages in their respective extension installation scripts.

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https://www.postgresql.org/docs/9.6/catalog-pg-pltemplate.html