Help Center/ Data Lake Insight/ SQL Syntax Reference (To Be Offline)/ Flink Opensource SQL 1.10 Syntax Reference/ Constraints and Definitions/ Syntax Definition/ Data Definition Language (DDL)/ CREATE FUNCTION
Updated on 2023-03-06 GMT+08:00
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CREATE FUNCTION

Syntax

CREATE FUNCTION
  [IF NOT EXISTS] function_name
  AS identifier [LANGUAGE JAVA|SCALA]

Function

Create a user-defined function.

Description

IF NOT EXISTS

If the function already exists, nothing happens.

LANGUAGE JAVA|SCALA

Language tag is used to instruct Flink runtime how to execute the function. Currently only JAVA and SCALA are supported, the default language for a function is JAVA.

Example

Create a function named STRINGBACK.

create function STRINGBACK as 'com.dli.StringBack'