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https://issues.apache.org/jira/browse/METRON-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16484368#comment-16484368
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ASF GitHub Bot commented on METRON-1568:
----------------------------------------

Github user cestella commented on a diff in the pull request:

    https://github.com/apache/metron/pull/1021#discussion_r189997710
  
    --- Diff: 
metron-platform/metron-common/src/main/java/org/apache/metron/common/configuration/enrichment/handler/StellarConfig.java
 ---
    @@ -142,8 +143,14 @@ else if(kv.getValue() instanceof List) {
       {
     
    --- End diff --
    
    I thought about about the variable context builder idea over lunch.  Is 
what you are proposing to change this so that `MapVariableResolver`, instead of 
taking a list of maps, we take a Map of maps.  e.g. 
`MapVariableResolver(Map<String, Map<String, Object>> variables)` and the 
resolution would check that map first?  So, for instance:
    ```
    MapVariableResolver resolver = new MapVariableResolver(ImmutableMap.of("_", 
message, "global", globalConfig));
    ```


> Stellar should have a _ special variable which returns the message in map form
> ------------------------------------------------------------------------------
>
>                 Key: METRON-1568
>                 URL: https://issues.apache.org/jira/browse/METRON-1568
>             Project: Metron
>          Issue Type: Improvement
>            Reporter: Casey Stella
>            Priority: Major
>
> In order to support functions which operate on the whole message, we should 
> have a special variable (_, keeping with the vaguely scala theme) which can 
> return the entire underlying message.  This map should be immutable.



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