yuokada / presto-sample-udf

Sample UDF Plugin for Presto

presto-sample-udf

Sample UDF Plugin for Presto

How to start Presto UDF

Read the SPI Overview and Functions documentation.

Build

# if mac os
% export JAVA_HOME=`/System/Library/Frameworks/JavaVM.framework/Versions/A/Commands/java_home -v "1.8"`

% ./mvnw clean compile package

deploy

Copy jar file to plugin dir. And, you restart presto server.

% mkdir /usr/lib/presto/lib/plugin/hello/
% cp target/presto-sample-udf-1.0-SNAPSHOT.jar /usr/lib/presto/lib/plugin/hello/
% /usr/lib/presto/bin/launcher restart

Examples

• prestodb-rocks/presto-example-udf: An example implentantion of Presto UDF functions
  Basic UDF sample code and unittest.
• aaronshan/presto-third-functions: Some useful presto custom udf functions
• qubole/presto-udfs: Plugin for Presto to allow addition of user functions easily
  Various UDF Sample Repository.

presto-sample-udf's Issues

Use Slices.EMPTY_SLICE

presto-sample-udf/src/main/java/io/github/yuokada/presto/udf/scalar/KuromojiUDF.java

Line 65 in 0bdf6b0

return zeroBlock;

can you include instructions how to use this function in Trino/Presto as well

There are no test case how to basically use or test whatever UDF function was created. It would be great, if you could also provide how to use this in Presto or Trino

Translate function

SELECT translate('012345', '135', 'abc');

• see: Hadoop利用者ならきっと知ってる、Hive/Prestoクエリ関数の挙動の違い - Qiita
• hive-translate/GenericUDFTranslate.java at master · markgrover/hive-translate
• 6.8. String Functions and Operators — Presto 0.182 Documentation

Implement getHostname and getHostAddress

ttps://github.com/prestodb/presto/pull/8544