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https://issues.apache.org/jira/browse/METRON-987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16042840#comment-16042840
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ASF GitHub Bot commented on METRON-987:
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Github user justinleet commented on the issue:
https://github.com/apache/metron/pull/609
A lot of this brings up the discussions around deprecating / dropping
functionality (both for Stellar and in general). It seems like ideally, we'd
be deprecating the map functionality in favor of the list functionality,
probably letting it ride a few releases, and eventually dropping it after a
migration period.
Do we need to start getting together a set of discussions and plans for
handling this sort of deprecation as we build out enhanced versions of older
features?
> Allow stellar enrichments to be specified by a list as well as a map
> --------------------------------------------------------------------
>
> Key: METRON-987
> URL: https://issues.apache.org/jira/browse/METRON-987
> Project: Metron
> Issue Type: Improvement
> Reporter: Casey Stella
> Assignee: Casey Stella
>
> 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:
> {code}
> "fieldMap": {
> ...
> "stellar" : {
> "config" : {
> "hostname" : "if ENDS_WITH(hostname, '.') then CHOP(hostname) else
> hostname",
> "hostname" : "TO_LOWER(hostname)"
> }
> }
> }
> {code}
> 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.
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