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From cestella <>
Subject [GitHub] metron pull request #609: METRON-987: Allow stellar enrichments to be specif...
Date Tue, 06 Jun 2017 23:50:26 GMT
GitHub user cestella opened a pull request:

    METRON-987: Allow stellar enrichments to be specified by a list as well as a map

    ## Contributor Comments
    Currently, stellar enrichments are specified by a map associating fields with the stellar
expressions associated with the fields. There is a significant downside here in that you cannot
update previously assigned fields. For instance, the following cannot be represented currently:
     "fieldMap": {
          "stellar" : {
            "config" : {
              "hostname" : "if ENDS_WITH(hostname, '.') then CHOP(hostname) else hostname",
              "hostname" : "TO_LOWER(hostname)"
    This would now be allowed thusly:
    "fieldMap": {
          "stellar" : {
            "config" : [
              "hostname := if ENDS_WITH(hostname, '.') then CHOP(hostname) else hostname",
              "hostname := TO_LOWER(hostname)"
    A consequent of this deficiency is that we also cannot use temporary variables and unset
them after their use inside an enrichment group.
    The proposed change is to allow users to use lists of strings representing stellar expression
assignments with the same syntax as the Stellar REPL. This would be as an alternative to maps,
but the map syntax would also be supported for legacy.
    Test plan to follow in comments.
    ## Pull Request Checklist
    Thank you for submitting a contribution to Apache Metron.  
    Please refer to our [Development Guidelines](
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    Please refer also to our [Build Verification Guidelines](
for complete smoke testing guides.  
    In order to streamline the review of the contribution we ask you follow these guidelines
and ask you to double check the following:
    ### For all changes:
    - [x] Is there a JIRA ticket associated with this PR? If not one needs to be created at
[Metron Jira](

    - [x] Does your PR title start with METRON-XXXX where XXXX is the JIRA number you are
trying to resolve? Pay particular attention to the hyphen "-" character.
    - [x] Has your PR been rebased against the latest commit within the target branch (typically
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    - [ ] Have you included steps or a guide to how the change may be verified and tested
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      mvn -q clean integration-test install && build_utils/ 
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    ### For documentation related changes:
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      mvn site
    #### Note:
    Please ensure that once the PR is submitted, you check travis-ci for build issues and
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    It is also recommended that [travis-ci]( is set up for your personal
repository such that your branches are built there before submitting a pull request.

You can merge this pull request into a Git repository by running:

    $ git pull stellar_list_support

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #609
commit e9ea04bc6e9f42e1029d1d7fa6e98fa00e0226fe
Author: cstella <>
Date:   2017-06-06T22:21:49Z

    Adding the ability to specify Stellar enrichments as lists as well as Maps.

commit cba07c78d91451eb1ec318418c418269e7127e38
Author: cstella <>
Date:   2017-06-06T23:17:11Z

    Documentation update


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