[jira] [Created] (METRON-1135) Make Stellar field transformations handle nulls properly

["Casey Stella (JIRA)" <ji...@apache.org>]

Casey Stella created METRON-1135:
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             Summary: Make Stellar field transformations handle nulls properly
                 Key: METRON-1135
                 URL: https://issues.apache.org/jira/browse/METRON-1135
             Project: Metron
          Issue Type: Bug
            Reporter: Casey Stella


As it stands, stellar field transformations disallow users to set variables to null (and thus remove the field).  This should be corrected.  For instance, 
{code}
"fieldTransformations" : [
        { "transformation" : "STELLAR"
        ,"output" : [ "new_field", "new_field2"]
        ,"config" : {
          "new_field" : "old_field"
         ,"new_field2" : "old_field2"
         ,"old_field" : "null"
         ,"old_field2" : "null"
                    }
        }
]
{code}
should rename "old_field" to "new_field and "old_field2" to "old_field2"  The current behavior is to keep all 4 fields and to not change old_field or old_field2 at all.



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