transmart/tranSMART-ETL — pull request #2 by keesvanbochove (2013-03-25 17:33:49+00:00)
Title: Make ETL pipeline more robust for null values

This change introduces an extra step in the load clinical data ETL pipeline: it will drop records of which the data value equals 'null'. This allows users to specify 'null' in a word mapping file for values such as -1 which mean that there is no data available for that specific cell.