Analytic functions in Pig UDF

Illustrative examples on how to implement analytic functions from data warehouses (e.g. Netezza) in Pig.

Functions:

• First Value
• Last Value
• Row Number
• Rank
• Dense Rank

For doing these functions in Hive UDFs, take a look at https://github.com/paulmw/hive-udf.

In addition, Rank and Dense Rank are also implemented with Hadoop MapReduce API (see com.cloudera.sa.mr package).

This project uses Maven. To build the software, simply use "mvn package".

Examples are provided for running in both Pig's local and mapreduce mode. Go to the sample/scripts directory. See the README file there for details.

• add PigUnit unit tests?