On this page

UDF Java Example
UDF SQL Example

Show all

Help Center/ MapReduce Service/ Component Operation Guide (LTS)/ Using Flink/ Using the Flink Web UI/ Managing UDFs on the Flink Web UI/ UDF Java and SQL Examples

UDF Java and SQL Examples

Updated on 2022-11-18 GMT+08:00

View PDF

UDF Java Example

package com.xxx.udf;
import org.apache.flink.table.functions.ScalarFunction;
public class UdfClass_UDF extends ScalarFunction {
    public int eval(String s) {
        return s.length();
    }
}

UDF SQL Example

CREATE TEMPORARY FUNCTION udf as 'com.xxx.udf.UdfClass_UDF';
CREATE TABLE udfSource (a VARCHAR) WITH ('connector' = 'datagen','rows-per-second'='1');
CREATE TABLE udfSink (a VARCHAR,b int) WITH ('connector' = 'print');
INSERT INTO
  udfSink
SELECT
  a,
  udf(a)
FROM
  udfSource;

Parent topic: Managing UDFs on the Flink Web UI

Previous topic: Managing UDFs on the Flink Web UI

Next topic: UDAF Java and SQL Examples

Feedback

Was this page helpful?

Helpful Not helpful

Provide feedback

Thank you very much for your feedback. We will continue working to improve the documentation.

The system is busy. Please try again later.

Which of the following issues have you encountered?

Content is inconsistent with the product UI

Unclear descriptions

Lack of examples or code

Incorrect steps

Can't find what I need

Lack of best practices

Feedback (optional)

0/500

Select at least one type of issue, and enter your comments or suggestions.

Enter a maximum of 500 characters.

Submit Cancel

Feedback

Feedback

Feedback

0/500

Selected Content

Submit selected content with the feedback