如何选择属于 PostgreSQL 中给定扩展的函数？

Question

我正在尝试编写一个SELECT从中pg_catalog提取函数名称、其架构名称和创建该函数的扩展名的函数。

拉取我使用的函数列表（简化版本）

SELECT pg_proc.proname, pg_namespace.nspname AS proschema
FROM pg_proc
    INNER JOIN pg_namespace ON (pg_namespace.oid = pg_proc.pronamespace)

要选择我可以运行的扩展

SELECT pg_extension.extname, pg_namespace.nspname as extschema
FROM pg_catalog.pg_extension
    INNER JOIN pg_catalog.pg_namespace ON (pg_namespace.oid = pg_extension.extnamespace)

现在我正在寻找它们在“”时创建的扩展和函数之间的链接CREATE EXTENSION。理想情况下，SELECT 应该生成 extension_name、extension_schema、foo_name、foo_schema 的列表

Answer 1

这个答案的所有功劳都归功于 LaurenzAlbe，他在评论中暗示了解决方案。列出扩展创建的函数的查询是

SELECT e.extname, ne.nspname AS extschema, p.proname, np.nspname AS proschema
FROM pg_catalog.pg_extension AS e
    INNER JOIN pg_catalog.pg_depend AS d ON (d.refobjid = e.oid)
    INNER JOIN pg_catalog.pg_proc AS p ON (p.oid = d.objid)
    INNER JOIN pg_catalog.pg_namespace AS ne ON (ne.oid = e.extnamespace)
    INNER JOIN pg_catalog.pg_namespace AS np ON (np.oid = p.pronamespace)
WHERE d.deptype = 'e'
ORDER BY 1, 3