This is a plugin for Logstash.
It is fully free and fully open source. The license is Apache 2.0, meaning you are pretty much free to use it however you want in whatever way.
This is a fork of logstash-codec-line (addedd CSV output based on template). Useful for webHDFS output plugin (save CSV files on HDFS). This codec will remove all empty variables like %{[var1]} or %{[array][var2]}.