Displaying All Functions

Function

View all functions in the current project.

Syntax

    
         SHOW [USER|SYSTEM|ALL] FUNCTIONS ([LIKE] regex | [db_name.] function_name);

In the preceding statement, regex is a regular expression. For details about its parameters, see Table 1.

**Table 1** regex parameters
Expression	Description
'xpath*'	Matches all functions whose names start with xpath. Example: SHOW FUNCTIONS LIKE'xpath* ; Matches functions whose names start with xpath, including xpath, xpath_int, and xpath_string.
'x[a-z]+'	Matches functions whose names start with x and is followed by one or more characters from a to z. For example, xpath and xtest can be matched.
'x.*h'	Matches functions whose names start with x, end with h, and contain one or more characters in the middle. For example, xpath and xtesth can be matched.

For details about other expressions, see the official website.

Keywords

LIKE: This qualifier is used only for compatibility and has no actual effect.

Precautions

The function that matches the given regular expression or function name are displayed. If no regular expression or name is provided, all functions are displayed. If USER or SYSTEM is specified, user-defined Spark SQL functions and system-defined Spark SQL functions are displayed, respectively.