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https://issues.apache.org/jira/browse/METRON-831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15960244#comment-15960244
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ASF GitHub Bot commented on METRON-831:
---------------------------------------
GitHub user cestella opened a pull request:
https://github.com/apache/incubator-metron/pull/517
METRON-831: Add lambda expressions and rudimentary functional programming
primitives to Stellar
## Contributor Comments
To enable use-cases where the user may want to do simple iteration, we can
expose simple functional primitives such as:
* `MAP`
* `REDUCE`
* `FILTER`
To fully support this, we will need lambda expressions as arguments to
these functions.
I also added a simple `LIST_ADD` to enable better testing of the functions
and because it was an easy-to-fill gap.
## Pull Request Checklist
Thank you for submitting a contribution to Apache Metron (Incubating).
Please refer to our [Development
Guidelines](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=61332235)
for the complete guide to follow for contributions.
Please refer also to our [Build Verification
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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](https://issues.apache.org/jira/browse/METRON/?selectedTab=com.atlassian.jira.jira-projects-plugin:summary-panel).
- [x] Does your PR title start with METRON-XXXX where XXXX is the JIRA
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### For code changes:
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```
mvn -q clean integration-test install && build_utils/verify_licenses.sh
```
- [x] Have you written or updated unit tests and or integration tests to
verify your changes?
- [ ] Have you verified the basic functionality of the build by building
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```
cd site-book
bin/generate-md.sh
mvn site:site
```
#### Note:
Please ensure that once the PR is submitted, you check travis-ci for build
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It is also recommened that [travis-ci](https://travis-ci.org) is set up for
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You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cestella/incubator-metron METRON-831
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-metron/pull/517.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #517
----
commit 73d085d103b5489a97ff770d7ee0bf02c327234a
Author: cstella <ceste...@gmail.com>
Date: 2017-04-07T01:16:52Z
METRON-831: Add lambda functions and rudimentary functional primitives
commit 42fcb0ad2d75f5b032844794081f71123426c68d
Author: cstella <ceste...@gmail.com>
Date: 2017-04-07T03:58:18Z
Added docs, changed around the syntax a slight bit to allow named args.
----
> Add lambda expressions and rudimentary functional programming primitives to
> Stellar
> -----------------------------------------------------------------------------------
>
> Key: METRON-831
> URL: https://issues.apache.org/jira/browse/METRON-831
> Project: Metron
> Issue Type: Improvement
> Reporter: Casey Stella
>
> To enable use-cases where the user may want to do simple iteration, we can
> expose simple functional primitives such as:
> * MAP
> * REDUCE
> * FILTER
> To fully support this, we will need lambda expressions as arguments to these
> functions.
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