SHOW FUNCTIONS

Примечание

Ниже приведена оригинальная документация Trino. Скоро мы ее переведем на русский язык и дополним полезными примерами.

Синтаксис

SHOW FUNCTIONS [ LIKE pattern ]

Описание

List all the functions available for use in queries. For each function returned, the following information is displayed:

• Function name

• Return type

• Argument types

• Function type

• Deterministic

• Description

Specify a pattern in the optional LIKE clause to filter the results to the desired subset. For example, the following query allows you to find functions beginning with array:

SHOW FUNCTIONS LIKE 'array%';

SHOW FUNCTIONS works with built-in functions as well as with custom functions. In the following example, three custom functions beginning with cf are available:

SHOW FUNCTIONS LIKE 'cf%';

     Function      | Return Type | Argument Types | Function Type | Deterministic |               Description
 ------------------+-------------+----------------+---------------+---------------+-----------------------------------------
 cf_getgroups      | varchar     |                | scalar        | true          | Returns the current session's groups
 cf_getprincipal   | varchar     |                | scalar        | true          | Returns the current session's principal
 cf_getuser        | varchar     |                | scalar        | true          | Returns the current session's user