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From cestella <...@git.apache.org>
Subject [GitHub] incubator-metron pull request #403: METRON-640: Add a Stellar function to co...
Date Tue, 10 Jan 2017 14:41:49 GMT
Github user cestella commented on a diff in the pull request:

    https://github.com/apache/incubator-metron/pull/403#discussion_r95375717
  
    --- Diff: metron-platform/metron-common/src/main/java/org/apache/metron/common/dsl/functions/StringFunctions.java
---
    @@ -284,4 +287,36 @@ private static Object fill(FillDirection direction, Object inputObject,
Object f
         }
         return org.apache.commons.lang.StringUtils.rightPad(input,requiredLength,fill);
       }
    +
    +  @Stellar( namespace="STRING"
    +          , name="ENTROPY"
    +          , description = "Computes the base-2 shannon entropy of a string"
    --- End diff --
    
    Good catch; this is, at this point, pretty classical work, so I link to the wikipedia
definition rather than claude shannon's original work.


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