[4] User Defined Functions (2011-10-06 02:43:26 +09:00) https://pig.apache.org/docs/r0.9.1/udf.html

[3] Pig ユーザー定義関数メモ(Hishidama's Apache Pig UDF Memo) (2016-11-29 08:13:49 +09:00) http://www.ne.jp/asahi/hishidama/home/tech/apache/pig/udf.html

[1] UDF · hiromasah/charsiu Wiki (2016-10-29 12:55:53 +09:00 版) https://github.com/hiromasah/charsiu/wiki/UDF

[2] UDF説明概要 · hiromasah/charsiu Wiki (2017-05-14 13:44:17 +09:00) https://github.com/hiromasah/charsiu/wiki/UDF%E8%AA%AC%E6%98%8E%E6%A6%82%E8%A6%81