SHOW FUNCTIONS (Databricks SQL)

Returns the list of functions after applying an optional regex pattern. Databricks SQL supports a large number of functions. You can use SHOW FUNCTIONS in conjunction with describe function to quickly find a function and learn how to use it. The LIKE clause is optional, and ensures compatibility with other systems.

Syntax

SHOW [ function_kind ] FUNCTIONS [ [ LIKE ] { function_name | regex_pattern } ]

function_kind
  { USER | SYSTEM | ALL }

Parameters

  • function_kind

    The name space of the function to be searched upon. The valid name spaces are :

    • USER - Looks up the function(s) among the user defined functions.
    • SYSTEM - Looks up the function(s) among the system defined functions.
    • ALL - Looks up the function(s) among both user and system defined functions.
  • function_name

    A name of an existing function in the system.

  • regex_pattern

    A regular expression pattern that is used to filter the results of the statement.

    • Except for * and | character, the pattern works like a regular expression.
    • * alone matches 0 or more characters and | is used to separate multiple different regular expressions, any of which can match.
    • The leading and trailing blanks are trimmed in the input pattern before processing. The pattern match is case-insensitive.

Examples

-- List a system function `trim` by searching both user defined and system
-- defined functions.
SHOW FUNCTIONS trim;
+--------+
|function|
+--------+
|    trim|
+--------+

-- List a system function `concat` by searching system defined functions.
SHOW SYSTEM FUNCTIONS concat;
+--------+
|function|
+--------+
|  concat|
+--------+

-- List a qualified function `max` from database `salesdb`.
SHOW SYSTEM FUNCTIONS salesdb.max;
+--------+
|function|
+--------+
|     max|
+--------+

-- List all functions starting with `t`
SHOW FUNCTIONS LIKE 't*';
+-----------------+
|         function|
+-----------------+
|              tan|
|             tanh|
|        timestamp|
|          tinyint|
|           to_csv|
|          to_date|
|          to_json|
|     to_timestamp|
|to_unix_timestamp|
| to_utc_timestamp|
|        transform|
|   transform_keys|
| transform_values|
|        translate|
|             trim|
|            trunc|
|           typeof|
+-----------------+

-- List all functions starting with `yea` or `windo`
SHOW FUNCTIONS LIKE 'yea*|windo*';
+--------+
|function|
+--------+
|  window|
|    year|
+--------+

-- Use normal regex pattern to list function names that has 4 characters
-- with `t` as the starting character.
SHOW FUNCTIONS LIKE 't[a-z][a-z][a-z]';
+--------+
|function|
+--------+
|    tanh|
|    trim|
+--------+